target
MOI4M03
Commissioning progress of the ESS linear accelerator
8
The European Spallation Source (ESS) is in the final stages of commissioning its linear accelerator (linac), which will deliver a high-power proton beam for neutron production. The commissioning process involves progressive testing of subsystems, including the ion source, radio-frequency quadrupole (RFQ), and superconducting cavities, to ensure stable and reliable beam operation. Key challenges include beam dynamics optimization, machine protection, and high-power RF system integration. Within this presentation an overview of the commissioning status, key milestones achieved, and expectations for the first beam on target, marking a significant step toward full facility operation could be given.
Paper: MOI4M03
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOI4M03
About: Received: 13 May 2026 — Revised: 19 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
MOO1T03
Progress towards a muon collider
34
The muon collider concept promises a unique opportunity to push the energy frontier in particle physics. The large muon mass suppresses synchrotron radiation and allows the acceleration and collision of the beams in rings and the use of technology more similar to hadron colliders. Muons are point-like, in contrast to protons, and thus can achieve a similar physics reach with less energy, allowing for a more compact machine. However muons have a lifetime of only 2.2 microseconds at rest. The muon beam thus needs to be cooled and accelerated rapidly to maximise the luminosity, which creates several technology challenges. The International Muon Collider Collaboration is implementing an intense R&D programme to address these challenges and to develop the concept maturity. The presentation will highlight the key challenges, summarise the progress of the work and the proposed R&D plan for the next decade.
Paper: MOO1T03
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOO1T03
About: Received: 13 May 2026 — Revised: 18 May 2026 — Accepted: 18 May 2026 — Issue date: 22 May 2026
MOP1025
Dependence of muon collider luminosity on ionization cooling performance
112
A 10 TeV center-of-mass muon collider is a high-energy lepton collider that has the potential to achieve physics reach comparable to significantly larger hadron colliders. The final luminosity depends on the performance of the entire complex, from muon beam production to the collider ring, including the rapid cooling and acceleration stages. Achieving the target luminosity imposes stringent constraints on the ionization cooling and the collider optics, such as extremely small betatron functions at the interaction points, which induce strong chromatic effects that ultimately limit the machine momentum acceptance. To meet the momentum acceptance requirements without significant luminosity loss, one possible strategy is to end the muon cooling stage earlier, since a reduction of the longitudinal emittance can be traded against larger transverse emittances with a shorter cooling system. A study of a common optimization of the ionization cooling and the collider ring design to maximize the luminosity is presented in this work.
Paper: MOP1025
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP1025
About: Received: 13 May 2026 — Revised: 21 May 2026 — Issue date: 22 May 2026
MOP1036
Benchmarking FLUKA Simulations of Double Channeling and Crystal Alignment Against the TWOCRYST Experiment
132
The TWOCRYST experiment at CERN is a proof-of-principle setup designed to demonstrate the feasibility of the future ALADDIN experiment, part of the Physics Beyond Colliders programme. The setup comprises two bent crystals installed in the LHC beamline at Insertion Region 3 (IR3). The first crystal (TCCS) extracts particles from the beam and directs them onto the second crystal (TCCP). This paper presents the FLUKA simulations performed to assess the crystals alignment procedures for various beam and crystal configurations. Since the alignment of the crystals is achieved mainly by monitoring the Beam Loss Monitor (BLM) signals in the vicinity of both bent crystals, the main objective of the simulations is to evaluate the corresponding BLM responses at each step of the procedure. These simulations aim to confirm the validity of the alignment process by demonstrating that the BLM signals can be reliably used to gauge proper crystal alignment. The simulation outcomes are presented here and were found to be consistent with experimental observations.
Paper: MOP1036
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP1036
About: Received: 12 May 2026 — Revised: 15 May 2026 — Accepted: 16 May 2026 — Issue date: 22 May 2026
MOP1040
Sensitivity of FCC-ee beam performance to resonance driving terms in the presence of beam–beam interactions
149
The control of nonlinear beam dynamics is essential for achieving the luminosity targets of FCC-ee, particularly in the presence of strong beam–beam interactions and machine imperfections. Resonance Driving Terms (RDTs) provide a systematic framework to characterize nonlinear dynamics and quantify the strength of resonances excited by nonlinear magnetic elements in the lattice. This contribution presents a sensitivity study of individual RDTs and their impact on beam losses, vertical emittance, and luminosity in FCC-ee, evaluated using tracking simulations including beam–beam interactions. The results establish a ranking of the relative importance of individual RDTs on the performance, providing guidance for future RDT-based correction strategies.
Paper: MOP1040
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP1040
About: Received: 13 May 2026 — Revised: 18 May 2026 — Accepted: 18 May 2026 — Issue date: 22 May 2026
MOP1043
Design of pion transport from the ESSnuSB+ target to the LEnuSTORM ring
157
Measurements of neutrino oscillations in low-energy regimes will require precise knowledge of neutrino-nucleus interaction cross sections for low-energy neutrinos. The **ESSnuSB+** project aims to fill the gap in the interaction cross section data by creating a well-quantified neutrino beam from the circulation of stored muons in a low-energy racetrack decay ring, LEnuSTORM. To produce the circulating muon beam, a pion beam will be generated via the impingement of a **1.25 MW** proton pulse on a target. The pions must then be focused, transported, and injected to the production straight of the decay ring wherein the pions will decay to muons. This contribution discusses the transport of the pions from the megawatt-class target station to their injection in the ring, and considerations for maximizing the muon yield – including momentum selection, maximization of acceptance, and designing a line with minimal path length to increase pion survival whilst accommodating optics matching and layout constraints.
Paper: MOP1043
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP1043
About: Received: 13 May 2026 — Revised: 21 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
MOP1044
Neutrino fluence estimates for forward experiments at a 10 TeV muon collider
161
Intense and highly collimated neutrino beams are intrinsic by-products of muon decays in a high-energy muon collider. The large boost of the primary muons confines the emitted neutrinos within angular spreads of order ($10^{-5}$ rad), resulting in fluxes far exceeding those achievable in conventional neutrino facilities. Their unique properties also open opportunities for high-energy neutrino physics. In this work, the neutrino beams produced near the interaction point are characterised in terms of their spatial and energy distributions, with emphasis on their potential use for dedicated neutrino detectors. The neutrino fluence is evaluated as a function of distance from the interaction point for representative detector acceptances. At short distances, larger acceptances intercept nearly the entire neutrino core, leading to fluence saturation, while at kilometre scales different acceptances yield comparable values as beam divergence becomes significant. These results demonstrate the strong collimation and intensity of muon-collider neutrino beams and support their potential use in high-precision, high-energy neutrino studies.
Paper: MOP1044
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP1044
About: Received: 07 May 2026 — Revised: 19 May 2026 — Issue date: 22 May 2026
MOP1054
LHC operation with oxygen and neon ions
181
During summer 2025, the CERN Large Hadron Collider operated for the first time with oxygen and neon ion beams. Three different machine configurations---with collisions of p‑O, O‑O, and Ne‑Ne and with varying beam energies and optics---had to be commissioned and exploited for physics operation during the eight days allocated. This short run was challenging because of its very tight schedule, the novel modes of operation, and new beam‑physics effects such as transmutation of oxygen and neon nuclei into other nuclei with the same magnetic rigidity. In spite of these challenges the run was very successful with the luminosity targets set by the LHC experiments fully met and, in most cases, even exceeded by large factors. In addition, time was allocated for machine studies, resulting in the first LHC data on crystal channeling with O and Ne ions. In this article we give a general overview of the LHC machine configuration, operational challenges, and experience during the run, as well as the achieved performance and the key contributors to the successful outcome. The results demonstrate the LHC’s flexibility for mixed‑species operation and give valuable input for future ion
Paper: MOP1054
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP1054
About: Received: 16 Apr 2026 — Revised: 12 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
MOP1057
LHC machine configuration evolution over Run 3 for maximised performance and inner triplet lifetime
185
Initially planned to start in 2021 and to end up in 2024, the third exploitation period of the LHC (Run 3) started in 2022 and was extended by two years to fit the adjusted schedule of the High Luminosity LHC (HL-LHC) project. Run 3 was not only marked by the exceptional performance of the machine (with 125 1/fb delivered to the two high luminosity experiments ATLAS and CMS, both in 2024 and 2025). Run 3 was also used as a unique opportunity for the transition between the LHC and the HL-LHC, both in terms of optics and beam parameters, in particular with the smallest beta* of 15 cm put in operation so far, and the highest bunch charge of 1.8e11 protons/bunch now regularly used in operation. In order to make this transition as adiabatic as possible, the machine configuration was modified year by year, not only to profit as much as possible from the incremental increase of the bunch charge available at the exit of the injector chain, but also to mitigate the radiation dose deposited in the inner triplets of the two high luminosity experiments ATLAS and CMS. This paper describes the main changes applied to the machine configuration over this period, together with the motivations.
Paper: MOP1057
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP1057
About: Received: 17 Apr 2026 — Revised: 06 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
MOP1089
Pulse stretcher for the PADME-X17 experiment
258
The PADME-X17 experiment is searching for a light dark matter candidate. The experiment would greatly benefit from the availability of a dedicated beam with long pulse duration and minimal instantaneous current. In this contribution, a third-order resonant slow-extraction scheme is considered, starting from the present lattice of the DAFNE damping ring. This solution, already integrated with the DAFNE complex, could provide the necessary positron-beam improvements within the existing facility. This study, currently aimed at improving the sensitivity of fixed-target experiments with positrons, could open new possibilities for beamlines based on the beam extracted from the damping ring.
Paper: MOP1089
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP1089
About: Received: 13 May 2026 — Revised: 17 May 2026 — Issue date: 22 May 2026
MOP1095
ESSnuSB+: target station studies
277
The ESSnuSB+ project aims to produce an intense neutrino beam using the high-power proton linac of the European Spallation Source (ESS). A key element of the facility is the target station, where a 2.5 GeV proton beam interacts with a granular titanium-sphere target to generate an intense pion-meson beam. These pions are focused by a magnetic horn and directed toward a storage ring before decaying into the muons that will be stored in the ring while emitting the neutrinos. In this work, detailed FLUKA simulations are used to model the full chain of particle production and energy deposition across major components of the target station. The simulations quantify the spatial distribution of deposited power and radiation dose. These results are essential for validating the feasibility of the target design, assessing component lifetime, and informing the engineering of cooling and shielding systems. Furthermore, updated predictions of the pion production are presented, representing the first step in the optimisation of the neutrino production for the ESSnuSB+ experiment. These results contribute to the overall design validation of the facility.
Paper: MOP1095
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP1095
About: Received: 07 May 2026 — Revised: 10 May 2026 — Accepted: 14 May 2026 — Issue date: 22 May 2026
MOP1105
Refined design of the front-end complex for a Muon Cooling Demonstrator at CERN
292
The muon collider has great potential for enabling high-luminosity multi-TeV lepton– antilepton collisions provided low-emittance, high-intensity muon beams can be produced. Ionization cooling is the proposed technique to achieve the required muon beam emittance. The International Muon Collider Collaboration aims to demonstrate the integration and reliable operation of a 6D ionization cooling system, including RF acceleration in strong magnetic fields. This study advances the design of the muon production and transport systems for a Muon Cooling Demonstrator implemented in the CERN CTF3 building. Building on previous work, the design is extended to finalise the beam-preparation section and the matching of the transport line into the cooling channel. The target–horn model has been further optimised and now incorporates a forced- convection helium cooling system, providing a more mature and realistic representation. An extended FLUKA model of the target area is used to assess and optimise shielding requirements.
Paper: MOP1105
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP1105
About: Received: 13 May 2026 — Revised: 20 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
MOP1111
Measured and simulated channeled-halo distributions for the TWOCRYST experiment at the LHC
311
The TWOCRYST experiment at the CERN Large Hadron Collider provides a unique setup to study the behaviour of high-energy beam particles channelled by bent crystals. Two two-dimensional detectors in Roman Pots enable direct observation of channelled protons at energies from 0.45 TeV to 6.8 TeV. We present measured channelled-beam distributions for two bent silicon crystals with 50 urad and 7000 urad bending and compare them to combined beam-dynamics and particle–crystal interaction simulations including the full LHC lattice. The measured positions of the channelled beam is compared with beam-position-monitor data of the main beam to assess the sensitivity of the channelled-beam trajectory to realistic orbit drifts, providing key input for the requirements of future bent-crystal-based fixed-target experiments.
Paper: MOP1111
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP1111
About: Received: 12 May 2026 — Revised: 16 May 2026 — Accepted: 17 May 2026 — Issue date: 22 May 2026
MOP1119
Preparations for the execution phase of BDF/SHiP at the HI-ECN3 facility in CERN's North Area
327
The High-Intensity ECN3 (HI-ECN3) Project will upgrade the ECN3 underground experimental area in CERN’s North Area, to host the Beam Dump Facility (BDF) and the SHiP experiment. The required refurbishment of underground infrastructure and associated surface facilities is scheduled for Long Shutdown 3 (LS3), while installation of BDF and SHiP is foreseen in 2030 and beam commissioning of the BDF is planned in 2031. HI-ECN3 must share specialised resources during LS3 with other activities in the SPS and the North Area, without having priority over them. This makes the coordination and scheduling of limited resources a challenge, particularly during LS3 when the workload will be at its maximum. To reduce these risks, a set of preparatory measures have been implemented ahead of LS3. This contribution details the key preparatory activities and efforts to smooth the demand on resources during LS3 and enhance the readiness of the ECN3 facility for the subsequent installation phase.
Paper: MOP1119
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP1119
About: Received: 12 May 2026 — Revised: 18 May 2026 — Accepted: 20 May 2026 — Issue date: 22 May 2026
MOP6001
Eliminating mains noise effects in accelerators with Machine Learning
341
Power supply ripples at various frequencies - characteristic to the magnet circuits or from the electrical network - have always been an issue in accelerator operations, with several mitigation measures put in place over the years. This contribution summarises the efforts in the CERN SPS over the last years to compensate the ripple at 50 Hz and its harmonics in the main quadrupole circuits, using Machine Learning methods. The detrimental effects of the ripple at low energy for LHC-type beams and at top energy for slow extracted beams are introduced. For optimal conditions of slow extracted beams, a continuous control algorithm had to be conceived. The implementation required hardware modifications on the power converter electronics side, additional new controls infrastructure and the development of adaptive algorithms that can deal with changes in the electrical distribution network throughout the day. Continuous control with tailored adaptive Bayesian Optimisation has been implemented for slow extracted spill control throughout 2024 and 2025. The improved spill quality obtained over the years will be discussed. Finally, results from R&D towards one-shot correction algorithms for beams that are only played on-demand (i.e. LHC beams) will also be briefly summarised.
Paper: MOP6001
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP6001
About: Received: 11 May 2026 — Revised: 22 May 2026 — Issue date: 22 May 2026
MOP6321
Evaluating in-context learning for Advanced Light Source EPICS process variable prediction
381
Large language models are becoming increasingly relevant for accelerator operations, where they assist with common tasks like retrieving historical data, preparing analysis scripts, and coordinating multi-step procedures. At the Advanced Light Source (ALS), these operators use their personal jargon (e.g. “sector 4 beam current”) to search for the correct PV name from numerous channels, resulting in countless variations of naming conventions. Strong scores on general-purpose benchmarks do not indicate how well a model maps operator jargon to facility-specific EPICS process variable~(PV) identifiers. Building on the semantic channel-finding benchmark, we evaluate chat-based large language models on two tasks using 101 ALS expert query–PV pairs. The first probes query-level grounding via single-item testing. The assessment is executed with varying inference-time cues, scored by character-wise correspondence (Levenshstein ratio). The second probes structural understanding by requiring the model to infer character-sequence mapping from the global naming-token vocabulary under prescribed edge-count budgets. We report precision, recall, combined retrieval score (F1), and token overlap (Jaccard similarity). Applied to 27 models, these evaluations split PV retrieval from structural understanding of hierarchical naming patterns, and offer strong dependency of end-to-end PV identification on the ALS control system's naming conventions.
Paper: MOP6321
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP6321
About: Received: 15 Apr 2026 — Revised: 16 May 2026 — Accepted: 16 May 2026 — Issue date: 22 May 2026
MOP6687
Overview of the accelerator operation at China Spallation Neutron Source since its official opening
604
The China Spallation Neutron Source（CSNS） is the first large-scale pulsed spallation neutron source in China and the fourth of its kind in the world. It is a large multidisciplinary user facility. The facility passed national acceptance and officially opened for operation in 2018. It has been in operation for seven years. During this period, the beam power has continually increased, and both the beam runtime and availability have gradually improved. In the 2023-2024 period, it achieved a maximum beam on target time of 5,433 hours and the highest beam availability of 97.4%, which are the best among similar international facilities. This article will comprehensively introduce the operational performance of the accelerator over the past seven years, including annual beam runtime, beam availability, and statistics on hardware system downtime. Additionally, it will briefly discuss some measures taken to enhance operational reliability, including hardware upgrades, software optimizations, and maintenance strategies.
Paper: MOP6687
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP6687
About: Received: 13 May 2026 — Revised: 18 May 2026 — Issue date: 22 May 2026
MOP7034
Status of the High Q-High G R&D activities on SRF cavities at INFN LASA
706
INFN LASA started an R&D activity dedicated to the development of knowledge needed to understand how to improve SRF cavity performances to reach High Q and High G values to accomplish the sustainability and cost reduction requests, as needed for the future large particle accelerators. This R&D activity, funded by INFN, is also enriched by synergies with other LASA activities as PIP-II low beta cavity production, the participation to ILC Technology Network, and by the LASA experience in SRF cavity industrialization developed during the large-scale production of the Eu-XFEL and the ESS SRF cavities. First results obtained on 1.3 GHz single and multi-cell cavities, and the status of the upgraded LASA infrastructures for Vertical Test are presented and discussed.
Paper: MOP7034
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP7034
About: Received: 13 May 2026 — Revised: 18 May 2026 — Accepted: 22 May 2026 — Issue date: 22 May 2026
MOP7060
Conceptual electromagnetic design of a Magnetised Hadron Stopper for the BDF/SHiP experiment at CERN
767
SHiP (Search for Hidden Particles) at CERN is a new experiment which aims to explore physics beyond the Standard Model by searching for long-lived, feebly interacting particles, as theoretically predicted by a large number of models. It will employ a dedicated Muon Shield (MS) to suppress the muon flux generated in proton–target interactions. The first magnet in the MS complex is the Magnetized Hadron Stopper (MHS), which serves a dual purpose: it absorbs residual secondary particles produced in the target region and initiates the deflection of muons with momenta up to 350 GeV/c. To achieve this efficiently, the MHS features an unconventional geometry without aperture, and it shall generate a field of 1.9 T in its core within a compact 2.3 m length. The paper describes the conceptual design of the MHS, which is driven by the demanding engineering requirements combined with the limited available space and high-radiation environment. The design of the magnetic circuit is achieving the required flux compression while ensuring maintainability in a high-radiation area, including the implementation of a non-magnetic spacer that enables disassembly under residual magnetization.
Paper: MOP7060
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP7060
About: Received: 12 May 2026 — Revised: 17 May 2026 — Issue date: 22 May 2026
MOP7113
Swiss Light Source 2.0 vacuum system conditioning and first year of operation
901
After more than two decades of user operation, the Swiss Light Source (SLS) entered a major upgrade phase in October 2023, targeting a 40-fold reduction of electron-beam emittance via a new 7-bend achromat lattice at 2.7 GeV. The vacuum system, central to machine performance, was completely rebuilt to meet the stringent requirements imposed by the compact lattice. The new storage ring vacuum consists of an 18 mm aperture, 288 m long system assembled from over 500 chambers. Following 14 months of installation, first beam was achieved in January 2025. Vacuum conditioning represented a critical milestone, enabling delivery of light, with nominal beam current, to the first experiments in April. This contribution presents the vacuum conditioning of the SLS 2.0 storage ring during this first year of operation, from initial commissioning to user operation.
Paper: MOP7113
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP7113
About: Received: 12 Apr 2026 — Revised: 17 May 2026 — Issue date: 22 May 2026
MOP7135
Design and Development of the New ISOLDE Beam Dumps at CERN
943
New beam dumps have been developed for the Isotope mass Separator On-Line facility (ISOLDE) at CERN, as part of the ISOLDE Beam Dump Replacement and Sustainability (IBDRS) project. The new design is engineered to ensure an operational lifetime of 30 years and, as by-product, to accommodate the planned doubling of beam power. The absorber assembly consists of water-cooled slices of cladded CuCr1Zr and pure copper. The cladding consists of an encapsulation of 316LN stainless steel, diffusion bonded to the cuprous core by means of Hot Isostatic Pressing (HIP). The cladded blocks are enclosed within a 316 LN stainless steel vessel, which allows the use of pressurised water to cool the dump. Extensive Monte Carlo and thermo-mechanical studies were conducted to evaluate temperature and stress distribution under nominal and accidental beam conditions, as well as the fatigue lifetime and cooling requirements. Prototyping of the cladded blocks have been produced successfully. This contribution presents the conceptual design, which employs advanced manufacturing methods to provide a sustainable and robust solution for the future ISOLDE beam dumps.
Paper: MOP7135
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP7135
About: Received: 12 May 2026 — Revised: 18 May 2026 — Issue date: 22 May 2026
MOP7137
Conceptual comparison of liquid lead flow configurations for a muon collider
951
Liquid lead is under investigation at CERN as a candidate material for a multi MW-Class production target for a future Muon Collider. A free-surface curtain was initially proposed to decouple structural walls from beam-driven shock waves resulting from the high instantaneous energy deposition on the target material. However, later studies revealed that the large vertical extent required for this configuration limits the particle production efficiency, which motivated the development of a jet concept proposed in this work. Because the target operates within a 20 T solenoidal magnetic field, magnetohydrodynamic (MHD) effects are expected to influence the liquid-metal flow. Estimates indicate operation at low magnetic Reynolds numbers, where electromagnetic induction is weak. Nevertheless, the strong applied magnetic field leads to significant Lorentz forces that can affect flow stability and hydraulic performance. Both configurations are analysed using coupled multiphase computational fluid dynamics-magnetohydrodynamics (CFD-MHD) simulations in the quasi-static approximation to investigate current distribution, magneto-hydrodynamic damping, and free-surface deformation. The comparison highlights the main physical trade-offs between the two concepts and defines the framework for ongoing design optimisation.
Paper: MOP7137
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP7137
About: Received: 11 May 2026 — Revised: 18 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
MOP7138
Target complex design for a high intensity beam dump facility in the north experimental area at CERN
955
The Search for Hidden Particles (SHiP) is a new high-intensity fixed-target experiment to be located within the Experimental Cavern North 3 (ECN3) at CERN’s North Area, utilising a 400 GeV proton beam from the SPS. The construction of a Beam Dump Facility (BDF) target complex is required for the successful operation of SHiP. It comprises an underground target station within the Tunnel Target Cave 8 (TCC8) cavern, adjacent to ECN3, which will house a 1.5 m-long, 0.25 m-diameter tungsten target, and an above ground service building that includes the target cooling systems and waste package infrastructure. The required infrastructure to investigate target failures, including the cutting of spent targets and other CERN legacy waste in view of their packaging for disposal, has been studied. This contribution presents the current design status of the target complex, including radiation protection, remote handling, utilities and cooling/ventilation systems, installation and operation procedures, maintenance and decommissioning plans, and sustainability aspects.
Paper: MOP7138
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP7138
About: Received: 24 Apr 2026 — Revised: 19 May 2026 — Issue date: 22 May 2026
MOP7140
Target design considerations for LINAC-based Astatine-211 production
963
Astatine-211 (At-211) is a highly promising radionuclide for Targeted Alpha Therapy, particularly for the treatment of metastatic cancers. However, its clinical adoption remains limited by production challenges. At-211 is typically produced by irradiating bismuth targets with 28-30 MeV alpha particles. Conventional cyclotrons are commonly used for this purpose, although their beam currents rarely exceed 0.1 mA, thereby significantly limiting achievable production yields. Linear accelerators (LINACs) offer an attractive alternative due to their potential for substantially higher beam currents, in the mA range. The Tera-Care Foundation is developing a dedicated high-power target system designed to operate under kW-level power deposition and a pulsed-beam structure. Initial analysis focus on estimating thermal loads, energy deposition profiles, and resulting temperature distributions to determine safe operating limits and prevent material degradation. This work establishes the foundational design framework required to enable reliable, high-power production of At-211 using LINAC technology.
Paper: MOP7140
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP7140
About: Received: 13 May 2026 — Revised: 18 May 2026 — Issue date: 22 May 2026
MOP7141
Development of a high-temperature electron beam test stand for thermal studies of the TATTOOS target at PSI
967
The Targeted Alpha Tumor Therapy and Other Oncological Solutions (TATTOOS) facility at the Paul Scherrer Institute (PSI) will address the growing demand for medically relevant radionuclides using proton-induced spallation at the PSI High Intensity Proton Accelerator (HIPA). The target is designed to operate with a 100 microA - 590 MeV proton beam at up to 2400 °C for 2–5 weeks. To study thermal mechanisms critical to target performance, a high-temperature test stand was developed based on PSI’s 60 keV, 100 mA electron beam welding machine. This setup allows heating tantalum foils in vacuum to melting temperatures while investigating thermal shock response, emissivity enhancement techniques, and temperature distributions using a Gaussian beam profile with wobbling frequency up to 1000 Hz. We will present here the static and wobbled beam profiles measurement using a 50 μm tungsten wire scanner moving up to 60 mm/s, with thermionic emission suppressed via voltage biasing. Then, FLUKA and CASINO simulations will show the penetration and scattering differences between the 590 MeV proton and 60 keV electron beams. Finally, temperature measurement for various rotation radii will be presented. Despite differing heating mechanisms, the resulting thermal behavior is directly comparable, supporting target design under realistic operating conditions.
Paper: MOP7141
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP7141
About: Received: 15 Apr 2026 — Revised: 19 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
MOP7175
Large scale production of amorphous carbon coatings for the new beam screens of the HL-LHC project
1071
The new beam screens for the High Luminosity LHC (HL-LHC) will be coated with a low Secondary Electron Yield (SEY) amorphous carbon (a-C) thin film to suppress electron multipacting and reduce heat loads to the cryogenic system. The production will cover 40 beam screens for the new superconducting magnets of the inner triplets in LHC interaction regions 1 (ATLAS) and 5 (CMS), as well as 24 beam screens for the drift line of the cryomodules housing the CRAB cavities. This contribution presents the implementation of a large-scale coating facility dedicated to the deposition of a-C films on the various HL-LHC beam screens, adaptable to different geometries and lengths up to 14 meters. The rationale behind the chosen coating technology and process parameters is discussed, with emphasis on adhesion optimization, SEY minimization, and production throughput to meet the HL-LHC schedule. We report on the current status of the production campaign, including quality assurance statistics, and highlight the main challenges encountered together with the solutions adopted.
Paper: MOP7175
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP7175
About: Received: 12 May 2026 — Revised: 15 May 2026 — Accepted: 16 May 2026 — Issue date: 22 May 2026
MOP7181
Energy Efficiency in the North Experimental Area at CERN
1092
The North Experimental Area at CERN is a versatile experimental facility that provides proton, hadron, electron, muon, and ion beams to over 2000 users annually for detector R&D and fixed-target experiments. Currently, this facility, which is more than 45 years old, is undergoing a consolidation program to enhance availability and reliability and to prepare for new experiments and test beams in the coming decades. In this context, and within the framework of ISO 50001, energy efficiency was assessed, potential energy-saving opportunities were identified, and various strategies for sustainable operation were evaluated. This contribution summarizes the results and outlines planned measures for future implementation.
Paper: MOP7181
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP7181
About: Received: 13 May 2026 — Revised: 15 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
MOP7185
Technological innovation for next-generation particle accelerators: key outcomes of the I.FAST project
1102
Next-generation particle accelerators demand innovative technologies able to meet the performance and sustainability requirements of particle physics and applied science, while ensuring high efficiency and reduced costs for industrial and societal applications. The I.FAST (Innovation Fostering in Accelerator Science and Technology) Project, supported by the European Commission under the Horizon2020 program, has fostered progress in the accelerator community by developing a portfolio of breakthrough technologies and strategic roadmaps for future research infrastructures, such as energy-frontier hadron and lepton colliders, and for medical and environmental applications. The project contributed to the development of novel accelerator designs – including multi-TeV muon colliders, plasma-based accelerators, and high-brightness synchrotron light sources – as well as advanced materials, high-performance components, and cutting-edge manufacturing and diagnostic tools. These efforts collectively aim to improve the energy-efficiency, sustainability, affordability, and compactness of future facilities. Key outcomes include novel radiation-resistant beam window and absorber materials, stabilization tools for laser accelerators, C- and X-band RF devices for free electron lasers, low-loss LTS and high-temperature superconducting CCT magnets, innovative SRF cavity fabrication and coating methods, additively manufactured linac structures, and high-efficiency klystrons and permanent magnets.
Paper: MOP7185
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP7185
About: Received: 16 May 2026 — Revised: 19 May 2026 — Issue date: 22 May 2026
MOP7186
CAD integration for the PETRA IV project
1106
The PETRA IV project at DESY in Hamburg aims for a new, 4th generation light source with first light in 2032. It comprises the installation of a completely new, 2.3km long 6GeV electron storage ring and a new injection chain, installation and refurbishment of 31 photon beam lines with 60 end stations, and the construction and refurbishment of 49 buildings including a new 600m long underground experimental hall. The project will reuse existing tunnels and halls of the PETRA III light source, and targets a dark time without beam of only 30 months, which is a challenging task that requires thorough planning. To meet this challenge, a comprehensive CAD model has been set up that integrates the data of all participants: construction, photon science, accelerator, campus and logistics. The model comprises representations of all systems and subsystems in different abstraction levels. A strict structure aligned with the project’s WBS and PBS, extensive use of interfaces, and a focus on review and change management processes ensure that the model is complete, consistent and correct and will remain so throughout the entire life cycle of the project.
Paper: MOP7186
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP7186
About: Received: 13 May 2026 — Revised: 21 May 2026 — Issue date: 22 May 2026
MOP8306
Conceptual design of a novel deuteron accelerator driven neutron source for nuclear waste transmutation
1147
A novel compact neutron source driven by *deuteron Cyclotron Auto-Resonance Accelerator* (dCARA) is under development to produce neutrons via breakup of high current 40-MeV deuterons on a low-Z target. Compared to the proton-based *Accelerator-Driven Systems* (ADS), a dCARA system can be much more compact and cost effective, with notable features including continuous acceleration without bunching for good beam stability, high efficiency, wide beam aperture, and an exceptionally short length of few meters. The applications of dCARA include transmutation of used nuclear fuel, medical isotope production system, or material test for a future fusion power reactor. The R&D progress and the conceptual design of dCARA are reported here.
Paper: MOP8306
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP8306
About: Received: 18 Apr 2026 — Revised: 16 May 2026 — Accepted: 17 May 2026 — Issue date: 22 May 2026
MOP8615
A computational methodology for the efficient AC-225 production via proton irradiation of RA-226
1153
Ac-225 is a crucial isotope for targeted alpha therapy, yet its clinical application is severely constrained by supply shortages. The use of high-intensity proton beams to irradiate Ra-226 targets offers a viable approach to significantly enhance Ac-225 production, as it enables higher yields and greater scalability. However, the process is also accompanied by the generation of other isotopes of actinium, especially the long-lived Ac-227, which challenges the purification process. This work establishes a precise parameterized model that correlates beam energy, target thickness, and cooling time with each other for optimizing Ac-225 production while minimizing Ac-227 impurity levels and target material consumption. We determine the optimal parameters, which effectively maximize Ac-225 yield while controlling impurity levels and target material consumption. This method provides a valuable reference for the efficient production of Ac-225
Paper: MOP8615
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP8615
About: Received: 11 May 2026 — Revised: 16 May 2026 — Issue date: 22 May 2026
MOP8617
Accelerator-driven radiation studies of YSZ-MgO composites for nuclear applications
1156
YSZ and YSZ-MgO thin films were deposited on Si (100) substrates using RF sputtering and RF-DC co-sputtering techniques and studied under low-energy heavy-ion irradiation. Two sets of films were prepared: YSZ sputtered in argon environment and YSZ and Mg co-sputtered in argon and oxygen environment. Irradiation studies show enhanced crystallinity in single-component YSZ and significant degradation of YSZ crystallinity in YSZ-MgO films. These results indicate a strong dependence of radiation response on composition of the material.
Paper: MOP8617
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-MOP8617
About: Received: 18 May 2026 — Revised: 20 May 2026 — Issue date: 22 May 2026
TUI4M01
Status and comparison of world-wide in-flight fragment separators
1240
Generation of rare isotope beams by means of in-flight separation of nuclear fragments and fission products requires complex optical structures usually comprising multiple separator stages. Large apertur magnets providing maximum acceptance, radiation hard and superconducting are used to separate the reference isotope from the bulk of the primary and secondary heayv ion beam. The pre-separator stages are designed to dump a majority of the secondary beam in a controlled way and are therefore often a challenge for radioprotection, shielding and beam catchers. The complex optics of fragment separators makes use of energy degraders, intermediate focal- and image planes to minimie contamination of the desired isotopes. A comparison of optical designs and magnet technologies will be presented.
Paper: TUI4M01
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUI4M01
About: Received: 21 May 2026 — Revised: 22 May 2026 — Accepted: 22 May 2026 — Issue date: 22 May 2026
TUP2331
First degraded beams in the CEBAF injector
1310
The electron beam degrader in the Continuous Electron Beam Accelerator Facility (CEBAF) injector at Jefferson Lab serves to generate electron beams with transverse emittance over 10x the nominal values, with the ultimate goal of using degraded electron beams to measure machine acceptance. Electron beams are degraded through multiple scattering in thin carbon foils, and maximum transverse emittance is defined through two collimating apertures. The degrader device was installed in late 2024, with commissioning and first beams on degrader targets during the 2025 physics run. We report on first operation of the degrader device.
Paper: TUP2331
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP2331
About: Received: 13 May 2026 — Revised: 18 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
TUP2335
Ultraviolet transverse shaping with structured-stochastic phase-plates for photocathode applications
1320
Low-loss ultraviolet (UV) transverse shaping has emerged as a critical enabling technology for modern photoinjectors, with fused-silica phase-plates offering a robust alternative to conventional shaping methods. Building on our NAPAC2025 work, we introduce a new generation of enhanced UV phase-plates that use genetically seeded structured-stochastic designs and multi-level nanofabrication. These designs are initialized using spiral-zone-plate phase patterns and yield smoother transverse profiles at the photocathode while further reducing normalized emittance. At LCLS-I, these phase-plates achieve a 25% emittance reduction (0.6 um to 0.45 um); beating expectations of 20% reduction predicted by Impact-T simulations. For AWA, we fabricated 2-inch fused-silica masks compatible with the upgraded gun and beamline optics. Leveraging multi-level nanofabrication capabilities at the Center for Nanoscale Materials, we produced plates with reduced phase quantization error, enabling high-quality shaping. These results broaden the design space for low-emittance, jitter controlled photoinjector operation demonstrating the maturation of passive UV beam shaping into a facility-ready technology.
Paper: TUP2335
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP2335
About: Received: 13 May 2026 — Revised: 18 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
TUP2626
Dynamic aperture prediction based on machine learning
1406
The dynamic aperture(DA) is one of the most important parameters of nonlinear beam dynamics in storage rings. It describes the transverse phase space region where the motion of a particle can remain stable. In the design and optimization of storage rings, long-term particle tracking is usually required to ensure an sufficient DA. However this process is very time consuming. This study explores the possibility of using machine learning methods for DA prediction. Firstly, several regression models from magnet strengths to resonance driving terms are constructed using different machine learning methods, showing that the use of machine learning can be applied to the nonlinear performance analysis of storage ring lattice. Then predictive regression models from magnet strength to DA are constructed, and the results show that artificial neural network have better prediction accuracy. The method will be further developed for nonlinear analysis and optimization of storage ring.
Paper: TUP2626
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP2626
About: Received: 15 Apr 2026 — Revised: 19 May 2026 — Accepted: 20 May 2026 — Issue date: 22 May 2026
TUP2676
Beam based alignment for bending magnets with transverse gradient
1481
For storage rings, bending magnets with transverse gradient are commonly adopted to reduce the natural emittance. These magnets are typically offset quadrupoles, which generate combined dipole and quadrupole fields. Therefore, it is crucial to ensure that the beam travels at the designed off-axis position within the target magnets. Otherwise, particles would experience an additional dipole field due to the magnetic field feed-down effect, which could influence the beam dynamics. To determine the beam position in the bending magnets with transverse gradient, a beam-based alignment method is presented in this paper.
Paper: TUP2676
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP2676
About: Received: 15 Apr 2026 — Revised: 28 Apr 2026 — Accepted: 22 May 2026 — Issue date: 22 May 2026
TUP2688
A novel method for measuring the energy spectrum of an inverse Compton scattering source based on nuclear resonance fluorescence
1509
We proposed a novel method of using nuclear resonance fluorescence (NRF) as a probe for spectrum measurements. By utilizing the continuous tunability of an ICS source, NRF photons can be excited at different points across the spectrum. The shape of the energy spectrum can then be effectively scanned and reconstructed by recording the relative NRF yields at different energy points. The feasibility of the proposed method was validated by Geant4 simulations of measuring NRF photon emission from 56Fe irradiated by an ICS source. The simulation results showed high precision for quasi-monochromatic gamma ray spectrum measurements, with a normalized root mean square error (NRMSE) of less than 5%. To maintain a sufficient signal-to-noise ratio (SNR) during the measurement, the energy resolution of detectors is suggested to be less than 1% of the energy being measured. Given an energy tuning precision of Delta E, the minimum measurable width of the energy spectrum, in terms of standard deviation, can reach 0.85 Delta E.
Paper: TUP2688
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP2688
About: Received: 13 Apr 2026 — Revised: 17 May 2026 — Accepted: 20 May 2026 — Issue date: 22 May 2026
TUP3078
Laser wakefield acceleration in carbon nanotube bundles
1674
Laser wakefield acceleration (LWFA) can produce accelerating fields of several hundred GV/m, greatly reducing accelerator size and cost. Carbon nanotube (CNT) bundles, featuring high plasma density (>10$^{19}$ cm$^{-3}$), tunable effective density, excellent thermal properties, and empty channels that enable laser propagation, have attracted interest as solid-state plasma sources. Previous studies suggested that CNT-based structures can increase the acceleration field to the TV/m range, making them promising for compact radiation sources and radiotherapy. However, the insufficient beam quality still limits their broader application. In this work, we model a hollow solid-state plasma channel composed of CNT bundles. A 2 PW laser from the ELI-ALPS High-Field Laser facility is injected into the channel, where self-injected electrons at the nC-scale are trapped and accelerated in a TV/m field, as shown by particle-in-cell simulations with WarpX. Comparing with previous LWFA results using solid-state targets, we obtain an electron beam with > 2 nC charge and > 100 MeV mean energy, while achieving an unprecedented energy spread < 5%, by tuning the filling factor, bundle diameter, and gap size. We clarify that the large energy spread in the overdense plasma arises from the laser-plasma instability. In addition, we observe strong scattering within the overdense bundle walls. We further aim to investigate how the scattering affects the laser field and, consequently, the beam quality.
Paper: TUP3078
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP3078
About: Received: 11 May 2026 — Revised: 20 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
TUP3079
High current accelerator-driven neutron source platform overview
1678
ESS-Bilbao, JCNS, and LLB joined forces to develop Europe’s first HICANS Platform (HiCANS stands for "High Current Accelerator-driven Neutron Source"). This project aims to integrate the high current proton accelerator system, currently under construction at ESS Bilbao, with the target-moderator-reflector unit that has been successfully built and operated at Forschungszentrum Jülich, and the HERMES reflectometer and Be target owned by LLB. This facility intends to validate and demonstrate the technological developments that will take part of these medium-flux neutron sources. In this demonstrator, the first stage of the ARGITU source will be used to produce a pulsed proton beam with an energy of 3 MeV and a period of 30 Hz to hit a Lithium target, generating neutrons that are moderated at the desired thermal and cold energy ranges that will be utilized by the HERMES neutron reflectometer. The instrument has undergone upgrades and improvements, since it was first installed in the COSY platform, such as the installation of a methane moderator, which has increased the reflectivity signal by a factor of two. The installation of the instrument in ESS-Bilbao premises will help to continue its experimental program, as well as paving the way to future integration of neutron scattering and imaging instruments at higher accelerator power.
Paper: TUP3079
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP3079
About: Received: 12 May 2026 — Revised: 16 May 2026 — Accepted: 17 May 2026 — Issue date: 22 May 2026
TUP3081
Shielding calculations and activation studies for the PSI Positron Production experiment
1681
The Future Circular Electron-Positron Collider (FCC-ee) is a proposed next-generation particle accelerator, planned as the first stage of the larger Future Circular Collider project at CERN. It is an electron-positron collider designed to be a precision instrument for studying fundamental physics. The PSI Positron Production (P$^{3}$) is the planned proof-of-principle experiment for the FCC-ee positron source. The main goal of this experiment is to test new technology and validate the envisioned positron production scheme. To this end, a prototype of the FCC-ee positron source will be hosted at the SwissFEL facility at the Paul Scherrer Institute in Switzerland. A dedicated bunker has been built inside the SwissFEL tunnel, and the experimental components are being installed. Simulations have been performed with the FLUKA.CERN Monte Carlo code to dimension the P$^{3}$ bunker and local shielding elements. Calculations have been repeated for various target models since different target options will be tested. This contribution briefly describes the ingredients of the P$^{3}$ experiment and details the dedicated bunker and the local shielding. It shows the expected dose rate distribution outside the P$^{3}$ bunker. The foreseen activation is also discussed.
Paper: TUP3081
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP3081
About: Received: 12 May 2026 — Revised: 14 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
TUP7356
ARIEL radioactive gas management system
1775
The ARIEL facility expands TRIUMF’s isotope production by adding two new target stations operating in parallel with the existing infrastructure, enabling high-intensity Radioactive Ion Beam (RIB) production. At the core of this facility, a complex vacuum system is designed to maintain the conditions required for RIB production while safely managing radioactive gases generated during beam-material interactions. The activated gases from the target and RIB modules are continuously evacuated and transferred via a radioactive gas management system to storage tanks for controlled decay. The radioactive gas management system is designed to support parallel and independent target station operation, prevent cross-contamination between exhaust streams, enable future scalability, and provide fault tolerance to ensure uninterrupted operation in the event of equipment failure. This system incorporates controlled gas recirculation and sampling capabilities to ensure the collection of a uniform sample for radiological assessment prior to release to the nuclear ventilation system. In addition, this system is operated and controlled remotely, enabling remote control of devices, data archiving, and implementation of interlocks for machine protection. Overall, this system offers a robust solution for radioactive gas management in modern accelerator facilities. This work presents the key design features and operational principles of the ARIEL radioactive gas management system.
Paper: TUP7356
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP7356
About: Received: 19 May 2026 — Revised: 20 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
TUP7626
Design and construction of a HOM-damped TM020 type harmonic cavity for luminosity enhancement in RI-electron scattering
1834
The RIKEN SCRIT facility that involves an electron storage ring (SR2) is a dedicated RI-electron scattering experiment. In the SCRIT system, the target RI ions are confined at high density on the beam axis by the focusing force provided by the electron beam itself. Therefore, electron beam stability is essential to increase the luminosity and maintain it for a sufficient time during scattering experiments. Since the current RF cavity induces beam instabilities due to higher order modes (HOM), a new HOM damped cavity is being designed and constructed and will soon be replaced. Here, we adopted the TM020 type harmonic cavity, which has recently been developed and first practically used at the NanoTerasu synchrotron light source. The cavity has coaxial slots at both the front and rear ends with ferrite absorbers inside. It is a very simple and compact design, yet it efficiently damps most resonant modes except for the TM020 mode. The design frequency of the TM020 is 956.220 MHz, which is the fifth harmonic of the current drive frequency 191.244 MHz, and accordingly the harmonic number in SR2 is changed from 14 to 70. As revealing from simulation studies, an increase in the harmonic number makes the trapping lifetime of the target RI ions longer, and this effect, coupled with the stabilization due to the disappearance of HOMs, is expected to significantly improve the luminosity performance in RI electron scattering.
Paper: TUP7626
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP7626
About: Received: 13 May 2026 — Revised: 18 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
TUP7627
Beam test of C-band Compact accelerating structure made of longitudinally-split two halves
1838
Our 6 MeV medical C-band accelerating structure is assembles using the disk-stacked method, where multiple oxygen-free copper components are stacked along the beam axis. The design incorporates the side-coupled (SC) structure and the re-entrant structure with an accelerating gap at the center of the cavity. Due to the complex shape and the large number of components, there are difficulties in manufacturing efficiency. On the other hand, the longitudinally-split method divides the structure along a plane including the beam axis, independent of the number of cells, typically into only two halves or four quadrants, which significantly reduces the number of components. Building on the development experience of the quadrant-type X-band accelerating structure in the CLIC project, we have been working on the development of a compact, high-gradient, high-shunt impedance, SC-type C-band accelerating structure based on this configuration. We had reported previous work, fabrication of the full-scale structure, low-power RF test result, and preliminary first beam acceleration test at an energy level limited by the testing facility. In this presentation, we will report the progress of our work, RF conditioning and a high-power beam test in the actual operating conditions.
Paper: TUP7627
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP7627
About: Received: 08 May 2026 — Revised: 19 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
TUP7630
Fabrication and Radio-Frequency tests of a 1.3 GHz 9-Cell copper cavity at room temperature as a process qualification step for Niobium superconducting cavity production
1849
The KU–KEK–KAT collaboration produced a 1.3 GHz copper 9-cell cavity with the goal of establishing a domestic Nb cavity fabrication flow in Korea, and performed pre-process verification under the same conditions as the Nb fabrication procedure. Prior to fabrication, the reliability of the actual manufacturing was enhanced through EM simulations and engineering simulations using CST, and the fabricated cavity was evaluated by measuring the resonance frequency with a network analyzer and tuning the frequency using a tuner. For this purpose, we construct new antenna by redesigning and simulating 1-cell measurement antenna to 9-cell antenna for room-temperature measurement, and all measurements were measured with this antenna. In the initial π-mode after fabrication, the resonance frequency was measured to be 1.275 GHz, which corresponds to about 90% of the design frequency of 1.3 GHz
Paper: TUP7630
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP7630
About: Received: 13 May 2026 — Revised: 15 May 2026 — Accepted: 19 May 2026 — Issue date: 22 May 2026
TUP7651
Magnet Measurements of the HALF Magnets
1885
The Hefei Advanced Light Facility (HALF), a fourth-generation light source based on a multi-bend achromat (MBA) lattice, is currently under construction. The storage ring consists of 20 cells and requires over 800 magnets. To assess the magnetic field quality and perform magnet fiducialization, several dedicated measurement systems have been developed. These include rotating-coil, stretched-wire, and Hall-probe systems. The field quality of multipole magnets is characterized using the rotating-coil system, while their magnetic centers are determined through single stretched-wire measurements. This paper presents the design of the measurement benches, outlines the corresponding measurement procedures, and reports measurement results.
Paper: TUP7651
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP7651
About: Received: 11 May 2026 — Revised: 21 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
TUP7666
Development of a Fast-feedback Deflector Magnet Power Supply for The Next Generation Heavy Ion Therapy
1916
Application of a 10 Hz fast-cycling induction synchrotron (IS) to the next generation of heavy ion therapy called Energy Sweep Compact Rapid Cycling Hadron Therapy (ESCORT), where the ion beam with energy sweeping is delivered tracking a tumor target in a deformed and moving organ and monitoring the irradiation dose profile in a real-time during irradiation, is under investigation* ** in the collaboration of KEK and SAMEER. To enable precise targeting, this power supply must allow the deflector magnet to shift the beam irradiation position accurately by varying the peak current value for each pulse with the excitation pattern of the main magnet system. This paper describes the initial experimental results obtained by combining a prototype power supply with a steering magnet.
Paper: TUP7666
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP7666
About: Received: 11 May 2026 — Revised: 19 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
TUP7668
Development of a Modular Magnet Power Supply with Parallel Operation for the Korea-4GSR Storage Ring
1920
The storage ring of the Korea-4GSR (Korea 4th Generation Synchrotron Radiation) facility currently under construction consists of a total of 1184 magnets, of which 792 are large-capacity magnets requiring rated currents of 140A or 280A. To drive these large-capacity magnets, magnet power supplies (MPSs) are required to support parallel operation in order to minimize the number of MPS types, thereby improving maintenance efficiency and reducing manufacturing costs. In addition, to ensure beam stability and low-emittance beam performance, current stability of less than 10 ppm and accuracy of less than 100 ppm under long-term operation are required during the prototype development. This paper presents a storage ring modular magnet power supply (SR Modular MPS) rated at 140A, which is designed in a modular form with master–slave-based parallel operation capability, allowing the rated output current to be expanded up to 280A through two-unit parallel operation. The proposed MPS can supply both 140A and 280A rated currents to large-capacity magnets using a single MPS type, and satisfies the MPS performance requirements over the entire operating range through a compensation method applied based on operating-condition-dependent characteristics. Experimental results demonstrate that the developed SR Modular MPS achieves a stability of 2.28 ppm and an accuracy of 45.79 ppm in single-unit operation, and a stability of 5.1 ppm and an accuracy of 45.88 ppm in parallel operation.
Paper: TUP7668
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP7668
About: Received: 18 May 2026 — Revised: 18 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
TUP7683
Study on the vacuum properties of Pd/Ti bilayer thin films
1943
Non-evaporable getter (NEG) thin films are essential for achieving ultra-high vacuum in the narrow-bore chambers. Pd/Ti bilayer NEG thin films were deposited on oxygen-free copper and silicon substrates by DC magnetron sputtering. The microstructure and elemental distribution were characterized by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The films exhibit a cauliflower-like surface morphology and a columnar cross-sectional structure, providing a high specific surface area and effective pathways for gas diffusion. The pumping speed for H$_2$ was evaluated using the constant-pressure dynamic flow method after activation at 150 °C for 12 h. The pumping speed decreases from 0.13 to 0.02 L s$^{-1}$ within a pumped quantity range of $1 \times 10^{-5}$ - $6.5 \times 10^{-3}$ Pa L. A non-monotonic variation in pumping speed was observed, which is attributed to hydrogen adsorption, dissociation on the Pd surface, and subsequent diffusion into the Ti layer for hydride formation. The results demonstrate that the Pd overlayer effectively enables low-temperature activation and enhances hydrogen sorption behavior, indicating that Pd/Ti NEG thin films are promising candidates for ultra-high vacuum applications in accelerator systems.
Paper: TUP7683
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP7683
About: Received: 15 Apr 2026 — Revised: 16 May 2026 — Accepted: 17 May 2026 — Issue date: 22 May 2026
TUP7711
Evaluation and Mitigation of Residual Magnetic Field from the High-Voltage Pulse Power Supply for the Beam Kicker in the Muon g-2/EDM Experiment
1992
In the J-PARC muon g-2/EDM experiment, precise control of the muon beam is essential to achieve the required measurement accuracy. For this purpose, the development of a new high-voltage and high-current pulse power supply(kicker power supply) is indispensable. Because the accuracy of the g-2 measurement strongly depends on the uniformity of the magnetic field, and the muon beam must remain confined within a region of 10 cm in height and a radius of 33.3 cm, any residual magnetic field leads to a degradation of the precision. While the design of the static magnetic field is being developed to meet the experimental requirements, the residual dynamic magnetic field remains a challenge. In this study, aiming to develop a power supply that satisfies the required precision, we evaluated the impact of the residual magnetic field caused by the kicker power supply on the measurement accuracy. This presentation will report the results of the evaluation and our efforts to reduce the residual magnetic field.
Paper: TUP7711
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP7711
About: Received: 16 Apr 2026 — Revised: 17 May 2026 — Accepted: 20 May 2026 — Issue date: 22 May 2026
TUP7731
Enhanced superconducting properties of Nb films via a high-power impulse magnetron re-sputtering/sputtering approach for Nb–Cu 1.3 GHz RF cavities
2025
Conformal deposition of high-performance superconducting films on complex cavity geometries, particularly ensuring robust film-substrate adhesion, remains a fundamental challenge. We address this by introducing a novel high-power impulse magnetron re-sputtering and sputtering (HiPIMRS) system designed for uniform niobium (Nb) film deposition on the interior surfaces of 1.3 GHz copper cavities. A key innovation is an in-situ copper substrate re-sputtering step prior to Nb deposition, which eliminates interfacial oxides and degradation, ensuring atomic-scale interfacial integrity. Through in-situ re-sputtering prior to deposition, we achieve oxide-free Nb/Cu interfaces with atomic-scale integrity. Crucially, electrical transport measurements demonstrate a significant enhancement in the superconducting transition temperature from 8.5 K to 9.3 K for HiPIMRS films, along with smooth surfaces (Rₐ < 20 nm) and a preferred (110) orientation. This work establishes HiPIMRS as a viable pathway for next-generation superconducting radiofrequency (SRF) cavity production, with its interfacial engineering protocols offering significant advancements in film conformity and superconducting properties.
Paper: TUP7731
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP7731
About: Received: 01 Apr 2026 — Revised: 15 May 2026 — Accepted: 16 May 2026 — Issue date: 22 May 2026
TUP8027
Estimation of Radiation Field for BDF/SHiP at CERN
2072
The Beam Dump Facility (BDF) will host the Search for Hidden Particles (SHiP) experiment at CERN’s Super Proton Synchrotron. BDF/SHiP is designed to search for feebly interacting particles in a region of mass and coupling accessible only with a dedicated beam-dump configuration*. With a beam intensity of 4E19 POT per year at 400 GeV, the High-Intensity ECN3 (HI-ECN3) Project will enable the search for feebly interacting particles, but the radation field created has the potential to be used parasitically to broaden the physics programme to nuclear astrophysics, materials science, and radiation-to-electronics research. High-momentum protons impinging on a tungsten target generate an intense radiation field leading to cumulative and single-event effects. In this work, the radiation environment and its impact on electronics of the detectors and associated infrastructure were evaluated through simulations performed with FLUKA Monte Carlo code. The results show that proposed optimisation solutions for shielding reduce radiation levels, keeping most effects within acceptable limits. It is also observed that modifications made to the magnetic field and geometry of the muon shield—which controls the deflection of muons produced in the beam dump to reduce flux reaching the detector—influence muon and neutrino backgrounds.
Paper: TUP8027
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP8027
About: Received: 13 May 2026 — Revised: 18 May 2026 — Accepted: 22 May 2026 — Issue date: 22 May 2026
TUP8032
Towards a Community of Practice in Project Management of Particle Accelerator and Big-Science Projects: The AcceleratePM Initiative
2083
Across Europe, several large-scale particle accelerator and big-science projects — each exceeding hundreds of millions of euros and extending over a decade — are under design or construction, with comparable initiatives underway in the US and China. Despite remarkable scientific achievements, many of them face cost and schedule drift, even when scientific performance targets haven’t been scaled down to maintain cost and timeline. Managing these complex, R&D-driven scientific facility projects requires approaches distinct from even the largest conventional infrastructure undertakings. Recognizing this need, a group of project management (PM) professionals active in particle accelerator initiatives has launched AcceleratePM*, the first international workshop dedicated to PM for accelerator and big-science projects. The first workshop, to be held at CERN in January 2026, will gather all major laboratories and projects to exchange methods, identify common challenges, and define best practices. This contribution presents the workshop scheme, themes, key-findings and planned outcomes, showcasing the largest recent projects – amongst which HL-LHC, ESS, FAIR, F4E – and aiming at informing the management of next-generation initiatives such as the Future Circular Collider (FCC). By building on common issues and most effective solutions, AcceleratePM intends to establish a lasting community of practice, shaping how large scientific projects are conceived, planned, and delivered.
Paper: TUP8032
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUP8032
About: Received: 12 May 2026 — Revised: 19 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
TUV8003
CERN Innovation Programme on Environmental Applications (CIPEA): leveraging accelerator technologies for environmental impact
2126
The CERN Innovation Programme on Environmental Applications (CIPEA) was launched in 2022 as a call for ideas to stimulate novel environmental applications based on CERN’s technologies, scientific expertise and unique research infrastructure. CIPEA has since evolved into an integrated framework encompassing many CERN initiatives aimed at generating environmental impact beyond the Organization’s own operational footprint. More than 25 projects are currently being developed with external partners, primarily from industry, drawing on competences integral to accelerator science, including superconductivity, high-field magnets, materials, cryogenics, vacuum systems, radiofrequency technologies, cooling and ventilation, and laser beams. Activities are structured around four key application areas: renewable and low-carbon energy; clean transportation and future mobility; climate-change mitigation and pollution control; and sustainability and green science. CIPEA is largely externally funded, with over 80% of its resources contributed by partner organizations. This paper outlines the programme’s overall strategy, describes the priority development axes within each application area, provides an overview of ongoing efforts and highlights selected flagship projects that exemplify CIPEA’s innovation potential.
Paper: TUV8003
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-TUV8003
About: Received: 13 May 2026 — Revised: 19 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
WEO6M01
AI and machine learning techniques for LNL accelerators
2193
The application of Artificial Intelligence (AI) and Machine Learning (ML) to particle accelerator systems has emerged as an effective strategy for managing complex operations and enhancing performance. At INFN-Legnaro National Laboratories (INFN-LNL), both offline and online AI/ML-driven approaches have been developed to improve beam dynamics, reduce setup times, and increase overall accelerator efficiency. Offline efforts focus on surrogate modeling of complex facilities such as ANTHEM BNCT, as well as on virtual diagnostics implemented using supervised neural operators. By combining these tools with AI/ML optimization algorithms, new design and commissioning strategies are being explored to further enhance beam quality and operational performance. In parallel, online real-time optimization strategies based on Bayesian Optimization (BO) has delivered promising results. Notably, at the PIAVE-ALPI superconducting accelerator, the application of BO improved beam transmission up to 85%, a significant increase compared to the typical operational average of 35%. These advances demonstrate the growing impact and future potential of AI/ML technologies in accelerator science and operations.
Paper: WEO6M01
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEO6M01
About: Received: 11 May 2026 — Revised: 18 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
WEP1012
FLUKA studies of spent beam extraction in the muon collider target system
2223
A multi-TeV muon collider relies on a particle souce based on a megawatt-scale proton beam striking a target to produce muons and pions immersed in a 20 T solenoid, followed by a tapering region and a chicane in solenoid magnets to capture and guide the pions and then muons toward cooling sections. For the characteristic target lengths that maximise the pion yield, a fraction of the proton beam is expected to exit the target without inelastic collisions. These protons carry high power in a highly collimated phase space, requiring a dedicated extraction scheme downstream of the target. Within the International Muon Collider Collaboration, simulations have been performed with the FLUKA Monte Carlo code to evaluate potential extraction strategies in both the target region and the downstream chicane. These studies assess power deposition, dose, and atomic displacements in the target and downstream areas and analyse shielding options to protect sensitive elements. The work defines the main radiation-driven design constraints and compares the main benefits and shortcomings of each option.
Paper: WEP1012
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP1012
About: Received: 13 May 2026 — Revised: 21 May 2026 — Accepted: 22 May 2026 — Issue date: 22 May 2026
WEP1301
RHIC Au-Au Operation at 100 GeV in Run 25
2239
The Relativistic Heavy Ion Collider (RHIC) Run 25 operations consisted of collisions of 100 GeV/u Au beams and a short 100 GeV polarized proton run for the STAR and sPHENIX experiments. A magnet wiring short resulting from the Run 23 failure repair resulted in a 2 month delay to the start of the run. Machine optimizations produced the highest ion performance in the history of the complex but the run was interrupted by a pair of two-week failure periods. This paper will discuss the progress made by each experiment and the failures and successes of the final year of the operation of the RHIC accelerators.
Paper: WEP1301
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP1301
About: Received: 10 May 2026 — Revised: 19 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
WEP1345
Dispersion suppression for wedge-based final cooling at a 10 TeV Muon Collider
2303
Reaching $10^{34}$ $\rm{cm}^{-2}s^{-1}$ luminosity range in a $10$ TeV Muon Collider within the short lifetime of the muon requires the reduction of the 6D emittance of the muon beam in a process described as muon ionization cooling. In the final cooling stage, the transverse emittance must be reduced to $22 \mu$m, typically by allowing longitudinal emittance growth up to downstream acceptance limits. While the current International Muon Collider Collaboration designs additionally involve $40$ T solenoids to reach the transverse emittance target, such high-field solenoids come with a number of disadvantages, including mechanical stress management, quench protection, and potential limitations in relying on High Temperature Superconductor technology. Designed as an alternative to using such solenoids while simultaneously reaching target transverse emittance, the previously proposed wedge-based, reverse emittance-exchange cooling scheme requires excellent dispersion suppression. In this study, we design and simulate a dispersion suppressor channel for the wedge-based final cooling design that reduces dispersion in the target direction to a target value of $D_x = 0.0036$ m.
Paper: WEP1345
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP1345
About: Received: 01 Apr 2026 — Revised: 15 May 2026 — Accepted: 17 May 2026 — Issue date: 22 May 2026
WEP1347
FLUKA-Based Optimization of Pion Production for a Muon Collider Demonstrator
2307
This study uses FLUKA simulations to investigate pion production from proton interactions with a graphite target for muon collider applications. A 40 cm target is struck with 0.8 GeV and 8 GeV/c proton beams, and pion yields are evaluated in terms of angular and energy distributions. The dependence of pion yield on target length is also examined, showing saturation near one interaction length for the 0.8 GeV beam, and saturation near two interaction lengths for the 8 GeV/c beam due to secondary interactions. In addition to total production, a subset of “acceptable” pions is defined based on capture constraints (kinetic energy <400 MeV, forward-going, and escaping the target). The results show that while the 8 GeV/c beam produces higher overall yields, the 0.8 GeV beam provides a larger fraction of pions within the desired constraints. Charge asymmetry is also observed in pion production, with implications for muon beam balance and collider luminosity.
Paper: WEP1347
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP1347
About: Received: 16 Apr 2026 — Revised: 19 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
WEP4311
Progress on Implementation of a Variable Wedge for FRIB ARIS
2403
A variable wedge system is being developed for the FRIB-Advanced Rare Isotope Separator (ARIS) facility to provide flexible control of beam energy loss. This research evaluates two parallel strategies: a multi-material six-piece solid wedge system and a liquid-filled wedge system. For the solid wedge, the control model and optimization algorithms have been developed and verified, with systematic testing confirming automated control across a 1–20 mrad range. Current efforts focus on exploring sub-mrad regimes (<1 mrad). To address fabrication limitations associated with very thin wedges, a multi-material method was developed in which materials with different densities are selected while maintaining constant areal density. This approach scales the effective thickness range by the density ratio, improving achievable thickness resolution and reducing deviations between calculated and experimentally achievable equivalent wedge configurations. Computational efficiency was further improved by using an L_∞trajectory solver to minimize total actuator displacement. This framework is currently being integrated into the fragment separator simulation code LISE++. In parallel, a liquid-filled wedge model was developed, utilizing a bellows-integrated cylindrical housing to enable continuous density tuning alongside adjustable wedge geometry. Together, these developments provide a robust basis for enhancing rare isotope beam delivery at FRIB.
Paper: WEP4311
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP4311
About: Received: 12 May 2026 — Revised: 18 May 2026 — Accepted: 20 May 2026 — Issue date: 22 May 2026
WEP4332
The LANSCE Accelerator Modernization Project front-end physics design and model
2446
The Los Alamos Neutron Science Center (LANSCE) accelerator at Los Alamos National Laboratory delivers different beams to multiple experimental stations simultaneously. These beams have different intensity and time structure. The LANSCE Accelerator Modernization Project (LAMP) seeks to upgrade the technology in the front-end while preserving the unique capabilities of LANSCE. LAMP seeks to replace the two 750-keV Cockroft-Waltons with a single RFQ, and a new 100-MeV DTL. New low-energy and medium-energy beam transport lines are necessary to produce the required LANSCE beam patterns. This contribution describes design process and the current state of the LAMP front-end physics model.
Paper: WEP4332
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP4332
About: Received: 08 May 2026 — Revised: 17 May 2026 — Accepted: 17 May 2026 — Issue date: 22 May 2026
WEP4608
Scenario of Beam-based Alignment with New BPM System for Future Beam Commissioning of 1.3-MW Operation at the J-PARC Main Ring
2494
In the main ring (MR) at the Japan proton accelerator research complex (J-PARC), beam-based alignment (BBA) is essential for precise calibration of beam position monitors relative to quadrupole magnet centers. With the upgrade of the beam position monitor (BPM) system for better precision scheduled in this summer, frequent and accurate BBA will become increasingly important to optics and orbit correction for realizing less beam loss and stable operation. In this study, a fast BBA method is experimentally investigated and compared with conventional approaches. The fast method uses orbit modulation within a single measurement to efficiently extract offset information. Experimental results show that the fast approach achieves alignment accuracy comparable to the conventional method while significantly reducing the required measurement time. These results demonstrate the feasibility of regular beam-based alignment measurements and provide a path toward more precise optics correction in the MR.
Paper: WEP4608
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP4608
About: Received: 13 May 2026 — Revised: 18 May 2026 — Issue date: 22 May 2026
WEP4648
Empirical Orbit Correction for 3-GeV Proton Beam Transport in Fringe Field from Front Solenoid of Secondary Beamline
2552
A 3-GeV proton beam from a rapid cycling synchrotron (RCS) is provided to muon and neutron production targets at Materials and Life Science Experimental Facility by a 3-GeV RCS to Neutron facility Beam Transport (3NBT) line in J-PARC. In the 3NBT line, the 3-GeV proton beam is deflected in the vertical direction due to fringe field of a large aperture solenoid for capturing secondary particles from the muon production target located approximately 30 m upstream of the neutron production target. For correcting the orbit deflection and eventually the vertical beam position on the neutron production target, the beam position was measured as function of excitation currents for the coils of the solenoid. In this presentation, we report results of the measurement analysis and the orbit correction based on the empirical analysis.
Paper: WEP4648
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP4648
About: Received: 13 May 2026 — Revised: 20 May 2026 — Accepted: 20 May 2026 — Issue date: 22 May 2026
WEP5007
Accumulator-to-Target Beam Transfer Line for ESSnuSB+
2587
The ESSnuSB project aims to generate an intense neutrino beam and the associated muon flux, using a 5 MW high-power proton driver, requiring precise and reliable transport of the accumulated beam to the target station. To achieve this, a dedicated transfer line guides the extracted protons from the accumulator toward the neutrino beam direction while meeting strict geometric constraints. The beam transfer line accommodates horizontal and vertical angular offsets of 16.8° and 2.29° using a compact sequence of horizontal and vertical dipoles, with quadrupoles ensuring controlled beam size and minimal losses. Simulations show that a lattice just over one hundred meters long successfully preserves beam quality and aligns the beam with the required neutrino direction. This guarantees stable, low-loss delivery of the beam to the downstream target system.
Paper: WEP5007
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP5007
About: Received: 07 May 2026 — Revised: 16 May 2026 — Accepted: 17 May 2026 — Issue date: 22 May 2026
WEP5023
Improving Energy Spread of MESA Beam in ERL Operation
2614
MESA, the Mainz Energy-Recovery Superconducting Accelerator, currently under commissioning at Johannes Gutenberg University Mainz, is designed to operate in two modes: external beam (EB) mode, with 150 μA polarized electrons at 155 MeV serving the P2 experiment, and energy-recovery linac (ERL) mode, with an unpolarized beam of 1–10 mA at up to 105 MeV for the MAGIX experiment. The latter requires precise control of the energy spread and the bunch length across various beam energies of 30, 55, 80, and 105 MeV. Comprehensive simulations were conducted using the tracking code ELEGANT; starting with a 4-ps bunch length, the full acceleration and deceleration process in ERL mode was modeled by optimizing the RF phase and the accelerating gradient field in off-crest operation, which results in the desired energy gain in each linac section. To reach the lowest energy spread, an appropriately selected longitudinal dispersion in the recirculation arcs is required. Since the beam is more sensitive to RF curvature and space-charge effects at low energies, reducing the bunch length by 50 % results in a small energy spread. Consequently, the injection arc lattice is optimized by adjusting the arc momentum compaction R56 as the primary tuning parameter. The integration of a chirp and R56 tuning enables efficient, controlled bunch compression and thereby enhances the overall beam quality.
Paper: WEP5023
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP5023
About: Received: 15 Apr 2026 — Revised: 17 May 2026 — Accepted: 17 May 2026 — Issue date: 22 May 2026
WEP5043
Cleaning turn-by-turn data from the LHC with autoencoders
2668
Turn-by-turn (TBT) BPM data in the LHC is often affected by noise, limiting the extraction of resonant driving terms (RDTs) and reducing the precision of nonlinear optics studies. We developed a denoising autoencoder trained on simulated tracking data to reconstruct clean transverse oscillations and suppress noise directly in the time domain. The method produces cleaner frequency spectra and significantly improves RDT visibility compared to established methods such as singular value decomposition, even when trained on fewer turns. In its current form, the autoencoder performs well on data that resemble the training set. However, when applied to new conditions—different noise levels, excitation amplitudes, tunes, or beam configurations—its ability to generalise decreases. These results demonstrate that autoencoders can substantially improve TBT data quality. Establishing broader and more diverse training datasets is a promising next step toward applying this technique to real LHC measurements.
Paper: WEP5043
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP5043
About: Received: 13 May 2026 — Revised: 19 May 2026 — Issue date: 22 May 2026
WEP5056
Analysis and Compensation of Crosstalk Effects for the Diamond-II Bending Magnets
2696
The close proximity of the magnets on the Diamond-II girders leads to significant crosstalk effects. This is of particular concern for the dipole component of the bending magnets, as the truncation of the fringe fields reduces the integrated strength and distorts the closed orbit. Tuning of the field strength and accurate alignment of the magnets is required to recover the target bend angles. A similar effect is seen on the quadrupole fields, and adjustment of the nominal gradients is required to restore the design optics. In this paper we present an overview of the modelling methods and latest results from these studies.
Paper: WEP5056
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP5056
About: Received: 11 May 2026 — Revised: 17 May 2026 — Issue date: 22 May 2026
WEP5072
Extrapolated optics measurement from BPM to instrumentation in LHC commissioning
2712
Segment-by-Segment (SbS) analysis is employed in accelerators for the determination of lattice errors and corrections, by identifying deviations between optics functions propagated through a modelled lattice segment and measured values. For the Large Hadron Collider (LHC), this method is routinely used during optics commissioning for the compensation of strong local errors in the experimental insertions and arcs. Beyond the determination of corrections however, the SbS approach is also of interest to propagate optics functions measured at the BPMs, to key instrumentation in other locations in the ring, for example to improve emittance measurements by providing more accurate estimates of the optics functions at relevant devices. The SbS tools used in the LHC have been further developed to support the propagation of measurement to lattice target locations distinct from the BPMs, leading to new possible applications. In this paper the analysis methods and results from recent LHC commissioning are presented.
Paper: WEP5072
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP5072
About: Received: 11 May 2026 — Revised: 18 May 2026 — Issue date: 22 May 2026
WEP6002
Transfer Learning for Generalizing a Hybrid Autoencoder-Isolation Forest Model for Time Series Anomaly Detection in ARRONAX Cyclotron Operational Data
2929
In the context of the operational monitoring of the ARRONAX C70XP cyclotron, our previous work addressed the limitations of the Isolation Forest (IF) algorithm in detecting local anomalies, particularly those occurring near the mean of normal data, due to its reliance on axis-parallel splits. To overcome this issue, we developed and validated a hybrid model combining an autoencoder and IF, using time series data from the proton beam intensity on target. This approach significantly improved the detection of both global and local anomalies, with no false alarms observed during evaluation. Building on these results, the present study investigates the use of transfer learning to generalize the hybrid model to other process variables originating from different subsystems, including the source, injector, and cyclotron core. Results suggest that the model can effectively label large volumes of multivariate operational data, supporting the development of a more scalable and integrated anomaly detection framework for the C70XP.
Paper: WEP6002
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP6002
About: Received: 17 Apr 2026 — Revised: 15 May 2026 — Accepted: 16 May 2026 — Issue date: 22 May 2026
WEP6016
Data-Driven Optimization of Open Loop Control Functions at the CERN Super Proton Synchrotron
2961
To minimize beam intensity loss during a cycle in the CERN Super Proton Synchrotron (SPS), several machine parameters must be adjusted as functions of cycle time, spanning injection, injection plateau, acceleration, and extraction plateau. Today, these functions are typically tuned manually – a cumbersome procedure that can require hours of operator effort. This paper presents the progress towards automatically tuning time-dependent parameter functions. Using Bayesian optimization (BO), we aim to minimize intensity loss throughout the cycle with intensity measurements as the primary feedback signal. We report results from applying this method to an intentionally detuned machine development beam in the SPS, as a step towards deployment on the operational fixed-target beams. The approach is generic and applicable to time-dependent parameter optimization problems in other machines.
Paper: WEP6016
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP6016
About: Received: 13 May 2026 — Revised: 17 May 2026 — Accepted: 17 May 2026 — Issue date: 22 May 2026
WEP6017
Towards Fully Automated Transfer Line Commissioning at the CERN Super Proton Synchrotron
2965
Beam commissioning of slow extracted beams from the CERN Super Proton Synchrotron (SPS) to the North Area experimental targets requires trajectory control through multiple transfer lines using corrector magnets—a process that traditionally demands significant expert intervention. Previous work demonstrated the feasibility of applying reinforcement learning (RL) for automated trajectory correction based on secondary emission monitor (SEM) split-foil intensity measurements, successfully centering the beam on target under nominal conditions. However, this approach fails when the beam is lost or its position exceeds the SEM's active surface, and when the corrector magnets' polarities are not known; common sources of uncertainty during commissioning. We present an extended multi-stage optimization scheme that addresses these critical limitations by automating beam threading when the trajectory exceeds the SEMs' acceptance, systematically identifying corrector magnet polarity configurations, and optimizing the impact angle to maximize beam intensity at the fixed-target stations, measured by scintillators arranged around the target. The threading algorithm employs quasi-random search combined with Bayesian optimization (BO) to center the beam in the SEMs, before handing over to the RL controller. The automated polarity determination uses online system identification to resolve sign ambiguities in the correctors, eliminating a common source of commissioning delays when using RL or other dedicated steering algorithms. Finally, BO is used to optimize the position of the movable SEM monitors at the targets' locations, maximizing target intensity.
Paper: WEP6017
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP6017
About: Received: 13 May 2026 — Revised: 18 May 2026 — Accepted: 20 May 2026 — Issue date: 22 May 2026
WEP6024
Localized Response Basis for Data-Efficient Transverse Beam Distribution Reconstruction Using a Multimode Fiber Relay
2985
Transverse beam imaging in radiation areas can be supported by relaying scintillation light through a multimode fiber (MMF) to a camera placed in a shielded area. However, the MMF scrambles the input, so a trained model is required to recover the beam distribution. This work studies a data efficient calibration method in which measured input and MMF output basis pairs are used as building blocks to synthesize training data for the reconstruction model. After an initial digital micromirror device based validation, the method was assessed using real beam data from CERN CLEAR, where data synthesized from a raster scan basis were used to train a convolutional autoencoder. The best model using this strategy achieved 7.37% mean normalized root mean square error (RMSE) across four transverse beam parameters, compared with 6.02% for a random scan reference model using roughly twice as many fully paired random scan samples. These results suggest that basis-based synthesis training, when combined with suitable beam image priors, can reduce reliance on large random scan MMF calibration datasets by replacing part of the calibration with a controlled scan of fixed size.
Paper: WEP6024
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP6024
About: Received: 13 May 2026 — Revised: 19 May 2026 — Accepted: 19 May 2026 — Issue date: 22 May 2026
WEP6074
IFMIF-DONES Beam on Target Diagnostics based on Optical Methods: OTR and Fluorescence
3076
The IFMIF-DONES facility located at Escúzar in Spain will consist of an accelerator delivering 125 mA of 40 MeV deuterons onto a liquid lithium target. The beam profile at the target will have a rectangular footprint with two side peaks to satisfy the irradiation requirements. The environment conditions are characterized by a high radiation background and the presence of lithium vapor. Additionally, deuteron scattering with residual gas and secondary-electron production occur. To measure the footprint under these conditions optical methods are designed based either on measuring Optical Transition Radiation (OTR) of the beam passing through the liquid lithium or on the Beam Induced Fluorescence (BIF) of the residual gas in the proximity of the liquid lithium. Both alternatives have its advantages and drawbacks. In this paper it is described the pros and cons of both alternatives. Furthermore, an experiment to better characterise the OTR response in liquid lithium is also presented.
Paper: WEP6074
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP6074
About: Received: 11 May 2026 — Revised: 18 May 2026 — Accepted: 19 May 2026 — Issue date: 22 May 2026
WEP6081
Advancing beam quality control in the CERN Proton Synchrotron
3104
Over the past years, the beam quality delivered by the CERN Proton Synchrotron (PS) has significantly improved, driven by major upgrades to both the accelerator and its controls infrastructure. As a result, user requirements have become increasingly demanding, particularly for high-brightness beams for the LHC, but also for fixed-target beams. The PS, known for its versatility in supplying beams with widely varying characteristics to multiple facilities, must now meet tighter performance specifications while maintaining reliability and operational efficiency. To address these challenges, a new beam quality monitoring framework has been developed, building on recent enhancements in data acquisition and online analysis capabilities. The system defines key beam quality metrics in real time, enabling early detection of drifts, root-cause fault analysis, and provides the foundation for automated corrections and machine learning–based optimisation. Complementing this analytical layer, a dedicated graphical interface provides operators with live observability of key parameters and short-term trends, facilitating rapid decision-making in the control room. This new approach represents a step change in the way beam quality is monitored and maintained in the PS, from reactive diagnostics to proactive control, supporting both operational stability and the increasingly stringent demands of CERN’s experimental program
Paper: WEP6081
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP6081
About: Received: 12 May 2026 — Revised: 17 May 2026 — Issue date: 22 May 2026
WEP6172
Dilution Monitoring for the BDF-SHiP Target
3308
The BDF/SHiP experiment requires precise monitoring of the beam dilution pattern on the high-power target absorbing up to 350kW (avg.). This paper presents the conceptual design of a dedicated Beam Dilution Monitor (BDM), which will enable observation of the circular beam sweep pattern during 400GeV/c proton operation. The proposed system is based on Secondary-Emission Monitor (SEM) grids comprising 12μm-thick titanium bands. Detailed simulations were performed to evaluate signal formation, thermal response, secondary-electron collection, and the detectability of dilution magnet failure scenarios. Different detector geometries and interlock strategies were also investigated, demonstrating that the proposed BDM concept can provide sufficiently fast and reliable detection of dilution failures.
Paper: WEP6172
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP6172
About: Received: 13 May 2026 — Revised: 19 May 2026 — Issue date: 22 May 2026
WEP6303
Efficient Five-dimensional Beam Sigma Matrix Determination Using Differentiable Simulation
3312
Precise reconstruction of the beam sigma matrix is critical for transport-line modeling and injection optimization. Our earlier work demonstrated that the differentiable simulation framework Cheetah enables gradient-based recovery of the 5×5 transverse sigma matrix at the APS-U BTS transport line using quadrupole scans. In this paper, we extend the method to improve efficiency and robustness. We introduce a generalized formulation that incorporates multi-screen measurements, providing increased stability in realistic lattice configurations. The differentiable-tracking approach yields physically consistent reconstructions while remaining computationally scalable. These developments form a practical framework for sigma-matrix determination in complex transport lines and support future real-time model calibration and tuning at the APS-U and similar facilities.
Paper: WEP6303
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEP6303
About: Received: 13 May 2026 — Revised: 17 May 2026 — Accepted: 17 May 2026 — Issue date: 22 May 2026
WEV6001
Overview of the RF based beam diagnostic monitors of HIPA at PSI
3373
The High Intensity Proton Accelerator (HIPA) at the Paul Scherrer Institute (PSI) delivers a continuous-wave (CW) proton beam at a frequency of 50.63 MHz, with currents up to 2.2 mA and a maximum energy of 590 MeV. The beam is successively directed to two meson production targets before reaching the spallation target. To monitor key beam parameters, various diagnostics based on the RF beam signal detection have been implemented. For beam intensity measurements, 11 resonators tuned at the second harmonic (101.26 MHz) have been deployed on the different beam lines. Capacitive probes in the cyclotrons provide the phase measurements; to improve the signal-to-noise ratio, the beam phase measurements are performed at the sixth harmonic. Beam energy is determined by extracting phase information from signals obtained via beam current monitors positioned along the beamline. In additional, a cross-correlation technique applied to phase pick-up signals at the entry and exit points of the cyclotron, enables a precise determination of the number of turns completed by the beam. Beam alignment on a rotating target is monitored using a novel fin-and-groove structure engraved on the target surface. The resulting intensity modulation, measured with a downstream beam current monitor, is analyzed in the frequency domain to directly infer the beam offset on target. Details of each diagnostic system, their implementation, and performance will be presented.
Paper: WEV6001
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-WEV6001
About: Received: 30 Apr 2026 — Revised: 07 May 2026 — Accepted: 17 May 2026 — Issue date: 22 May 2026
THO4M01
Update on the FAIR machine installation status
3401
The accelerator complex for the Facility for Antiproton and Ion Research (FAIR) is currently being built in Darmstadt, Germany. After the arrival of the cold box for the central cryogenic facility (CRYO2) in winter 2023, the installation of the accelerator components in the machine and supply tunnels started early 2024. Meanwhile the installation has moved forward. CRYO2 has been handed over to the commissioning team and the commissioning is in progress. The accelerator installation is ongoing in all parts of the beamlines of the High Energy Beam Transfer Lines (HEBT), the Super Fragment Separator (SFRS) and the Heavy Ion Synchrotron (SIS100). In parallel, the installation plans for the experiments (NUSTAR and CBM) are being developed and installation preparations are taking place. In this paper the status and challenges of the machine installation in those areas are presented and an outlook for the next steps towards realisation of the project phases for Early and First Science is given.
Paper: THO4M01
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-THO4M01
About: Received: 13 May 2026 — Revised: 20 May 2026 — Issue date: 22 May 2026
THO4M02
Beam commissioning and upgrade progress for the CSNS-II RCS
3406
For the China Spallation Neutron Source (CSNS), the rapid cycling synchrotron (RCS) accumulates and accelerates the injection beam to the design energy of 1.6 GeV and then extracts the high energy beam to the target. In this paper, firstly, the beam commissioning of the RCS have been comprehensively studied, including new injection system commissioning, longitudinal dynamics optimization, beam instability mitigation, tune optimization, closed orbit correction, beam loss optimization, bayesian optimization and so on. In order to meet the requirements of beam power increase and stable operation of the CSNS accelerator, the RCS beam losses from different sources are studied and optimized. With the aid of weekly radiation dose measurement, the hot spots of the RCS are studied in depth to explore the causes and find the solutions. Secondly, as the second phase of the CSNS, CSNS-II will achieve a beam power on the target of 500 kW. The injection energy of CSNS-II will be increased from 80 MeV to 300 MeV and the injection beam power will be increased about 20 times. In this paper, the challenges and solutions of the CSNS-II RCS will be introduced and the upgrade of the RCS will be studied. Based on the detailed simulation results and beam experimental results, the upgrade schemes of the critical systems for the CSNS RCS has been proven feasible.
Paper: THO4M02
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-THO4M02
About: Received: 13 May 2026 — Revised: 22 May 2026 — Issue date: 22 May 2026
THP2017
Comparison of numerical methods to determine quadrupole centres for beam based alignment
3456
A beam-based alignment procedure is used to realign the beamt to the centres of the quadrupoles, enabling calibration of BPM offsets. Accurately determining these quadrupole centres is an important step that requires analyzing BPM data collected while modulating the nearby quadrupole and one or more corrector magnets in the ring. In this paper, several numerical methods to extract the quadrupole centres, with or without error analysis, are presented and their results are compared. This study is based on online experiments performed at Diamond.
Paper: THP2017
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-THP2017
About: Received: 11 May 2026 — Revised: 18 May 2026 — Accepted: 19 May 2026 — Issue date: 22 May 2026
THP4012
Beam performance reach at CERN PSB for the ISOLDE facility
3877
The Proton Synchrotron Booster (PSB) at CERN is the first synchrotron of the proton accelerator chain and provides beam not only to the LHC and the rest of the injector complex, but also serves directly ISOLDE. This facility is one of the most demanding users in terms of beam intensity, receiving more than 60% of the overall protons produced at CERN. To further optimize beam delivery while accommodating new beam users at CERN, systematic studies are conducted to identify the performance reach. Current efforts focus on maximizing the achievable intensity in the PSB and assessing the impact on the isotope production at the facility.
Paper: THP4012
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-THP4012
About: Received: 13 May 2026 — Revised: 20 May 2026 — Issue date: 22 May 2026
THP4022
Accelerator development for the High Brilliance Neutron Source (HBS-I)
3911
Neutrons are an indispensable tool for science and industry to study the structure and dynamics of matter from the meso to the pico scale and from seconds to femtoseconds. An attractive way to provide urgently needed neutrons in the near future is to build efficient high-current, accelerator-based neutron sources (HiCANS) using pulsed proton beams. A new national research infrastructure that benefits significantly from these developments will be the High Brilliance Neutron Source (HBS-I), which was recently shortlisted by the Federal Ministry of Research, Technology, and Space (BMFRT). HBS-I uses pulsed 100 mA high-current proton beams to generate neutrons through a low-energy nuclear reaction at 20 MeV in a target material, which requires less radiation shielding and moderator cooling compared to conventional neutron sources. The facility is designed to produce small-diameter neutron beams, enabling experiments with smaller sample volumes. This will support research in materials and life sciences, including materials for energy conversion and storage, nanomaterials, quantum materials, protein structures, and biomaterials. The facility is intended for use by a multidisciplinary community of universities, research institutions, and industry. The basic concept and its realization will be presented.
Paper: THP4022
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-THP4022
About: Received: 11 May 2026 — Revised: 21 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
THP4030
ARGITU RFQ bead-pull tuning and RF tests at ESS-Bilbao
3926
In this paper we describe the static tuning procedure of the ARGITU/HiCANS-platform RFQ at ESS-Bilbao. The machining and assembly of the RFQ were finished during 2025. The cavity is a 3.1 meters long, 4-vane cavity operating at 352.2 MHz. It will accelerate a 40 mA (designed up to 65 mA) proton beam from 45 keV to 3.0 MeV. The RFQ will operate at 1% duty cycle in the first stages of the ARGITU HICANS platform, and later as the injector of the linac at a maximum duty cycle of 5%. The static tuning of the cavity has been carried out combining the field profiles measured by a bead-pull technique with the aid of both a conventional "SVD" algorithm and a novel genetic algorithm that was required due to the available tuners range at the operational frequency. The whole procedure and the results are described in this paper, as well as other tests at low power RF and with the cooling water in operation. The stability of the field profiles and the cavity frequency with respect to the cooling water temperature are also investigated.
Paper: THP4030
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-THP4030
About: Received: 12 May 2026 — Revised: 20 May 2026 — Accepted: 20 May 2026 — Issue date: 22 May 2026
THP4033
Outcomes of the DONES consolidation project activities
3936
IFMIF-DONES is an ESFRI facility based on a 40 MeV, 5 MW beam power deuteron accelerator and a liquid lithium target currently under construction in Granada (Spain) as part of the European roadmap to fusion electricity. Its main goal is to characterize and qualify materials under a neutron field with an induced damage similar to the one expected in a fusion reactor, developing a material database for the future fusion nuclear power plants. Moreover, a number of medium neutron flux experiments in other irradiation areas for fusion and non-fusion applications have been proposed and are under analysis. Although the construction phase is ramping up, the European EURATOM Project DONES-ConP1 has been directed at the preparation of the key documentation and to consolidate contributions from the parties. In this contribution, the main outcomes of the project, such as the first proposal of the DONES Experimental Programme, consolidation of the DONES users community, users and machine interfaces, the evolution of the ideas for the complementary experiments, organization and project documentation for safety licensing will be presented and described.
Paper: THP4033
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-THP4033
About: Received: 13 May 2026 — Revised: 20 May 2026 — Issue date: 22 May 2026
THP4061
The High Intensity ECN3 project and the SPS Beam Dump Facility at CERN
4006
The Search for Hidden Particles (SHiP) fixed-target experiment has been approved to lead the search for dark matter at CERN, which has so far evaded discovery at the Large Hadron Collider. To meet SHiP’s demanding beam and infrastructure requirements, the High-Intensity ECN3 (HI-ECN3) project has been mandated with upgrading CERN’s North Area and equipping its only underground experimental cavern (ECN3) with a new Beam Dump Facility (BDF) capable of exploiting the maximum slow-extracted proton intensity available from the Super Proton Synchrotron (SPS). This contribution summarises the key technical challenges currently being addressed in the HI-ECN3 technical design phase and outlines the schedule, developed in synergy with the ongoing North Area Consolidation project (NA-CONS), to complete the upgrade and deliver first beam to the BDF in 2031, ensuring SHiP data taking before Long Shutdown 4 (LS4).
Paper: THP4061
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-THP4061
About: Received: 28 Apr 2026 — Revised: 19 May 2026 — Accepted: 22 May 2026 — Issue date: 22 May 2026
THP4062
Commissoning of the S3 Spectrometer: advances, challenges and outlook
4010
The linear accelerator of the SPIRAL2 facility at GANIL delivers both light ions to study nuclear reactions with neutrons in the Neutron for Science (NFS) experimental hall, and heavier ions to produce exotic nuclei, like heavy and super heavy nuclei, in the Super Separator Spectrometer (S3). By combining electromagnetic components and thanks to their very large aperture, S3 is a powerful tool to purify most of the elements of interest produced in the target from the primary intense ion beam, and retrieving them up to the focal plane to analyse them. The search for very rare events in nuclear reactions requires advanced technics that are not standard in our laboratories, which in S3 are fulfilled by the 7 superconducting multipoles triplets, the large gap of the electric dipole, the high performance movable beam dump and the fully instrumented target station. This poster will generally give an overview of the on-going technical installation and commissioning of this new scientific facility at GANIL.
Paper: THP4062
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-THP4062
About: Received: 13 May 2026 — Revised: 21 May 2026 — Issue date: 22 May 2026
THP4064
Recent Results of Beam Emittance and Transport at ALTO-LEB Platform IJCLAB
4017
The ALTO research platform at the Laboratoire de physique des 2 infinis Irène Joliot Curie (IJCLab) is dedicated to wide-ranging research in nuclear physics, nuclear astrophysics and interdisciplinary activities such as health physics. ALTO-LEB is the low energy beam area of ALTO where neutrons rich exotic nuclei are studied. This paper focuses on the final analysis of beam emittance measurments made at ALTO-LEB dedicated to the characterisation of the ion source. The obtained results were also used to study beam transport along the low-energy beam line, and the outcomes of this study are also presented. Those results are also directly connected to the reliability of ALTO-LEB beam lines initiated at IJCLab in 2018.
Paper: THP4064
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-THP4064
About: Received: 04 May 2026 — Revised: 20 May 2026 — Accepted: 21 May 2026 — Issue date: 22 May 2026
THP4067
Simulation based machine protection for the Super-FRS
4024
Starting in 2027, the Super-FRS will produce and separate rare isotopes for nuclear physics experiments at the Facility for Antiproton and Ion Research (FAIR). To reach isotopes further toward the nuclear drip line, the separator uses heavy-ion beams of higher energy (>1.5 GeV/u) and intensity (>3*10^11 238U/s) compared to previous facilities. These primary beams, as well as the secondary fragment beams produced in reaction targets, can damage detectors along the beamline and may cause quenches in the superconducting magnets. To prevent such scenarios, it is essential to ensure that all beams are correctly separated and stopped in dedicated beam dumps. For this purpose, a machine protection system is being developed to verify every new machine setting required during diverse experimental campaigns. To avoid slowing down machine operation, the system simulates, in near real time, all (fragment) beams for different magnet settings, targets, degraders, and detectors throughout the entire separator. The planned capabilities of this machine protection system and the currently achieved prototype are presented.
Paper: THP4067
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-THP4067
About: Received: 12 May 2026 — Revised: 19 May 2026 — Accepted: 20 May 2026 — Issue date: 22 May 2026
THP4113
Development and characterization of a neutron beam at the Bonn Isochronous Cyclotron
4135
The Bonn Isochronous Cyclotron provides light ion beams with a charge-to-mass ratio Q/A ≥ 1/2 and kinetic energies ranging from 7 to 14 MeV per nucleon to one of five experimental sites. It is planned to extend the facility’s irradiation and experimentation capabilities by providing a neutron beam at one of the experimental areas in the near future. The neutrons are produced in a thick carbon converter through the deuteron breakup and proton stripping reactions. Protons are stopped in the converter whereas the neutrons’ flux and angular energy distribution is optimized by a subsequent copper/tungsten collimator. Geant4 simulations were done and benchmarked against literature in preparation. The predicted neutron yield is in the order of 1e7 neutrons/s, the beam profile is a circular flat top beam with a FWHM of approx. 4 cm and energy distribution is centered around 10 MeV. The beam profile was measured by using a 2D-Line-Scan with a scintillator with n-gamma discrimination properties. The energy distribution will be measured with activation foils. This contribution gives an overview of the setup and compares the simulated beam profile with experimental measurements.
Paper: THP4113
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-THP4113
About: Received: 13 May 2026 — Revised: 19 May 2026 — Issue date: 22 May 2026
THP5316
Simulation and analysis of high-energy beam transport lines at LANSCE
4203
The Los Alamos Neutron Science Center (LANSCE) target stations require reliable beam quality to carry out experiments under optimal conditions. Maintaining the bunch structure through the beam transport from the 800-MeV Linac to the target stations is crucial. Currently, beam transport tuning is the primary tool to control the beam, although multiple simulation tools are being developed as ones to model the beamlines. The high-energy beamlines (HEBT) are simulated with accelerator physics codes such as Elegant and MAD-X. These models are continuously improved by incorporating key beam characteristics and lattice elements. They are benchmarked against experimental data where diagnostics are available. We are improving these tools to better understand beam optics and conduct studies aimed at optimizing beam performance. In this report, we present the latest simulation results supporting more predictive beam transport downstream of the 800-MeV Linac.
Paper: THP5316
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-THP5316
About: Received: 12 May 2026 — Revised: 19 May 2026 — Issue date: 22 May 2026
THP5319
Beam-based alignment for sextupoles via parallel optimization
4207
We propose a method to perform beam-based alignment measurement for multiple sextupoles simultaneously by minimizing the induced orbit shifts from sextupole modulation through parallel local orbit optimizations. The parallel optimization is made possible by using local orbit bumps as knobs and separating the induced orbit kicks through model-based response matrices. The approach reduces slow, multi-knob optimization problems into multiple fast, single-knob optimization problems. The method is demonstrated in simulation.
Paper: THP5319
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-THP5319
About: Received: 10 May 2026 — Revised: 20 May 2026 — Issue date: 22 May 2026
THP5350
Search for Vlasov-Poisson equilibrium distributions using generative models
4258
This work proposes the use of generative models and differentiable simulations to search for smooth equilibrium phase space distributions in arbitrary external fields. The model parameters are optimized using a two-term loss function: one term suppresses density fluctuations, while a second term pulls the solution toward some target value, for example, to encourage smoothness. As an initial demonstration of this approach, we search for a four-dimensional equilibrium distribution in a linear continuous-focusing lattice.
Paper: THP5350
DOI: reference for this paper: 10.18429/JACoW-IPAC2026-THP5350
About: Received: 13 May 2026 — Revised: 18 May 2026 — Issue date: 22 May 2026