Speaker
Description
Steady-state microbunching (SSMB) is a promising mechanism for generating high-average-power coherent radiation by maintaining microbunches in a storage ring. In an SSMB laser modulator (LM), the interaction between electron bunches and the recirculating coherent undulator radiation can drive longitudinal beam instabilities, which may limit the overall performance. In this work, we investigate the longitudinal single-bunch multi-turn instability using a cavity mode decomposition approach. The evolution of the longitudinal wakefield is derived by expanding the radiation into a complete set of cavity eigenmodes, accurately capturing the optical evolution of the field over multiple turns. The longitudinal beam dynamics equations are formulated to analyze the instability growth rates. Numerical simulations show excellent agreement with the theoretical model, validating the mode decomposition technique. These findings provide critical insights into the instability characteristics and suggest effective mitigation strategies for the design and operation of SSMB storage rings.
Funding Agency
National Key Research and Development Program of China (No. 2022YFA1603403),
National Natural Science Foundation of China (No. 12522512, 124B2104)
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