Initial test of a bunch feedback system with a two-tap FIR filter board
1997; American Institute of Physics; Linguagem: Inglês
10.1063/1.52292
ISSN1935-0465
AutoresM. Tobiyama, E. Kikutani, T. Obina, Y. Minagawa, T. Kasuga,
Tópico(s)Gyrotron and Vacuum Electronics Research
ResumoInitial beam test of the KEKB bunch-by-bunch feedback system prototypes has been performed in the TRISTAN-AR on the longitudinal plane. A simple two-tap finite impulse response (FIR) filter system consisting of hardware logic realizes the function of the phase shift by 90°, the suppression of static components, and the delay of up to a hundred turns. With the prototype filter board and a longitudinal kicker, the feedback loop has been closed successfully. The shunt impedance of the kicker was estimated from the excitation amplitude and measured damping. The damping time of the system has been measured by using the single-bunch Robinson instability. The feedback system stabilized the coupled-bunch instability completely under 8-bunch operation.
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