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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 4: Beam Dynamics

AKBP 4.1: Talk

Monday, March 9, 2026, 16:45–17:00, SCH/A117

Improving Energy spread of MESA beam in ERL operation — Esraa Khidr and •Florian Hug — Johannes Gutenberg university Mainz

Precise control of longitudinal beam dynamics is crucial at the Mainz Energy-Recovering Superconducting Accelerator (MESA), particularly in support of the MAGIX experiment, which operates in ERL mode. Comprehensive simulations were conducted using the elegant tracking code; starting with 4 ps bunch length, the full acceleration and deceleration process in ERL was modeled by optimizing the RF phase and the accelerating gradient field in off-crest operation, resulting in the desired energy gain in each linac section. At low energies, improved energy spread is required with a short bunch length; therefore, the injection arc was optimized for a 2 ps bunch by adjusting the arc momentum compaction R56 and introducing an energy*position correlation (chirp) downstream of MAMBO. The resulting optimization provides enhanced bunch compression and reduces the longitudinal phase-space width, while preserving longitudinal emittance and thereby enhancing overall beam quality not only at the lowest but also at all energies.