Speaker
Description
Intra-beam scattering (IBS) can substantially enhance the slice energy spread of high-brightness electron beams, thereby degrading the performance of free-electron laser (FEL) facilities. This effect is particularly detrimental for advanced operation modes such as self-seeding, which impose stringent requirements on beam longitudinal coherence. Consequently, an accurate evaluation of IBS growth in both the injector and the main linac is essential. SHINE, the first superconducting-linac–based FEL facility in China, has recently completed beam commissioning up to the first bunch compressor (BC1). In this work, we present a theoretical and numerical analysis of IBS-induced slice energy spread growth throughout the SHINE injector and linac. The analytical estimates show good agreement with start-to-end simulations, confirming that IBS leads to a significant increase in slice energy spread already at the injector stage. These results highlight the necessity of incorporating IBS considerations into the beam dynamics design and optimization of high-repetition-rate FEL facilities such as SHINE.
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