Speaker
Description
In next generation light sources, double RF systems are widely employed to lengthen bunches, thereby enhancing the Touschek lifetime and suppressing IBS effects. However, the harmonic cavity (HC) in such systems can drive various types of longitudinal instabilities, which severely impede effective bunch lengthening. In theory, a low-level feedback (LLRF) system can be used to selectively modify the cavity impedance to suppress these longitudinal instabilities. In this paper, we design a physical model for such a LLRF feedback system and implement its functionality in code. This implementation is subsequently integrated as a module into an existing longitudinal tracking simulation program. Simulation results from the new code show excellent agreement with theoretical impedance analysis, providing strong support for the design of feedback parameters.
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