This paper presents the enhancement of photon beam position stability at the Siam Photon Source (SPS) through a real-time feedback control system based on a Sliding Mode Control (SMC) algorithm. The proposed system employs Photon Beam Position Monitor (pBPM) measurements within a global orbit feedback loop to minimize beam position fluctuations. The SMC-based Fault-Tolerant Control (FTC) algorithm enhances system robustness by effectively compensating for disturbances, and actuator faults, thereby maintaining stable beam conditions under various operational scenarios. Experimental results demonstrate that the integration of SMC significantly reduces photon orbit deviations and improves synchrotron radiation quality. By strengthening reliability and adaptability, the developed control system ensures precise beam positioning, making the SPS more dependable for scientific and industrial applications that demand high beam stability.

The Productive Research Environment (PRE) session at IPAC’25 explored practices and challenges in fostering sustainable and motivating research environments in the accelerator community. A preliminary survey of 51 managers and leaders revealed high levels of motivation during the early career stage, but also highlighted concerns regarding staffing shortages, budgetary constraints, and the long-term career prospects of young researchers.　Session presentations addressed career experiences, sustainable institutional models, and survey-based perspectives across different career stages. The subsequent panel discussion engaged additional senior leaders and covered key themes including human resources and diversity, leadership development, mentorship and supervision, and intergenerational collaboration. The session concluded that clear goals, adequate resources, inclusive cultures, structured leadership and mentoring, and effective knowledge transfer are essential for productive research environments. Despite current limitations, the strong motivation of young researchers offers a promising foundation. Building on this, PRE aims to expand its surveys and sustain dialogue at future IPAC meetings to strengthen human resource capacity and foster diversity across the global accelerator community.These findings and perspectives will be reported and further discussed at the conference.

A 280-MeV electron linear accelerator has been designed to expand the research capabilities and applications of high-energy electron beams in Thailand. For commissioning and energy verification, two dedicated beam dumps are positioned downstream of the bending magnet. This work presents the simulation-based design and optimization of these beam dumps using the PHITS Monte Carlo radiation transport code. Different material configurations and geometries were evaluated to reduce prompt radiation and suppress secondary particle leakage. A multilayer structure combining high-Z and low-Z materials was found to provide effective energy absorption while confining photon and neutron secondaries within the shielding volume. The resulting radiation field in the tunnel meets all applicable safety criteria and regulatory limits. These results establish the validated baseline design for the beam dumps and support their transition to detailed engineering and fabrication.

The Siam Photon Source II (SPS-II) booster synchrotron plays a crucial role in delivering high-quality electron beams, enabling efficient injection, and ensuring stable and reliable operation of the fourth-generation storage ring. To improve booster performance and operational robustness, the linear accelerator (Linac) injection energy has been upgraded to 270 MeV. This work presents comprehensive beam dynamics studies of the SPS-II booster during energy ramping from 270 MeV to 3 GeV. Particle-tracking simulations were performed under realistic operating conditions, including synchrotron radiation effects, multi-pole field errors, residual closed-orbit distortions, and aperture constraints. The simulation results demonstrate stable beam acceleration and high transmission efficiency throughout the energy ramping cycle.