Speaker
Description
The Main Linac of the Super Tau-Charm Facility (STCF) injector comprises 36 series-connected constant-gradient traveling-wave accelerating structures. Variations in injection timing induce complex coupling between the independent RF transient filling and transient beam loading effects, systematically altering the beam energy spread. As a bunch traverses successive structures, these localized coupled perturbations propagate, accumulate, and superimpose. This cascading impact severely restricts the overall energy stability and beam quality. This paper systematically investigates the dual-transient coupling mechanism in a single structure, perturbation differences under varying injection timings, and the cumulative amplification characteristics across the multi-stage configuration. The findings provide a vital theoretical foundation for RF timing co-regulation and transient perturbation suppression, effectively enhancing beam quality stability for the STCF.
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