MOP6381

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URL	https://doi.org/10.18429/JACoW-IPAC2026-MOP6381
Title	Exploring causes of Beam Loss at CEBAF
Authors	C. Matthews, B. Terzic Old Dominion University B. Freeman, D. Moser, D. Turner, J. Benesch, J. Samari, K. Price Thomas Jefferson National Accelerator Facility R. Bodenstein Old Dominion University, Thomas Jefferson National Accelerator Facility
Abstract	At Jefferson Lab, the Continuous Electron Beam Accelerator (CEBAF) features a unique design with two linear accelerators and two arc sections allowing for multiple turns of the electron beam, as well as four experimental end stations. This topology leads to increased beam losses, especially in the spreader and recombiner regions connecting the arcs to the LINACs and in the extraction regions connecting the experimental end stations to the accelerator. These losses result in equipment activation and operational interruptions. Recent upgrades to the facility’s diagnostic systems, including the addition of xenon ion chambers, have provided higher-resolution data regarding these loss events. Building on this improved observational capability, we are developing a simulation framework using optics codes and the Geant4-based BDSIM to model beam extinction and halo formation in these regions. This work aims to correlate simulation results with experimental data to isolate the causes of beam loss and inform future machine tuning strategies. We present a summary of conclusions drawn from recent operational studies and outline a plan to model the beam loss and validate the simulations.
Paper	download: MOP6381.pdf
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Conference	17th International Particle Accelerator Conference
Series
Location	Deauville, France
Date	17-22 May 2026
Publisher	JACoW Publishing, Geneva, Switzerland
Editorial Board	Editorial Board
Online ISBN	978-3-95450-252-3
Online ISSN	2673-5350
Received	12 May 2026
Revised	16 May 2026
Accepted
Issued	20 July 2026
DOI	10.18429/JACoW-IPAC2026-MOP6381
Pages	510-513
Copyright	Published by JACoW Publishing under the terms of the Creative Commons Attribution 4.0 license. Any further distribution of this work must maintain attribution to the author(s), the published article's title, publisher, and DOI.