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This paper introduces the development and preliminary testing of a digital bunch-by-bunch feedback system designed to suppress beam oscillations. Coupled-bunch instabilities, which arise under high-current and multi-bunch operation modes, can induce beam oscillations that significantly degrade collision luminosity and reduce beam lifetime. These instabilities necessitate active feedback suppression. Based on a field-programmable gate array (FPGA) as the core processor, this work independently designed a finite impulse response (FIR) digital filter suitable for transverse feedback and developed the corresponding signal processing electronics. Each functional module of the electronics was tested, with results aligning with design expectations. Furthermore, a comparative analysis was conducted between two filter design methods—the time-domain least squares method and the selective filter method—to determine the optimal algorithm and parameters.
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