Down Sam 1 led Signal Processin ii for a B Factory ( A / I )

A bunch-by-bunch feedback scheme is studied for damping coupled bunch synchmtron oscillations in the proposed PEP11 B Factory. The quasi-linear feedback system design incorporates a phase detector to provide aquantized measure of bunch phase, digital signal processing to compute an error correction signal and a kicker system to correct the energy of the bunches. A farm -of digital processors, operating in parallel, is proposed to compute correction signals for the 1658 bunches of the B Factory. This paper studies the use of down sampled processing to reduce the computational complexity of the feedback system. We present simulation results showing the effect of down sampling on beam dynamics. Results show that down sampled processing can reduce the scale of the processing task by a factor of 10.