Title :
Study of bunch by bunch feedback system in TRISTAN-AR
Author :
Tobiyama, M. ; Kikutani, E.
Author_Institution :
Accel. Lab., KEK, Tsukuba, Japan
Abstract :
Beam tests of the KEKB bunch by bunch feedback system prototypes have been performed in the TRISTAN-AR on both longitudinal and transverse planes. A two-tap FIR filter system consisting of hardware logics realized the function of the phase shift by 90 degrees, the suppression of the static component and the delay of up to a few tens of turns in longitudinal plane with 508 MHz of system clock. The transverse systems were purely analog system without any digital signal processing part. More than 100 bunches with maximum current of 376 mA have been accumulated successfully with the bunch spacing of 2 ns. The growth time and the growing modes of the transverse instabilities has also been measured with the memory function of the two-tap FIR filter. It suggests that the bunch-by-bunch feedback system is a powerful tool to explore the source of the instabilities
Keywords :
FIR filters; accelerator control systems; electron accelerators; feedback; particle beam stability; storage rings; KEKB bunch by bunch feedback system prototypes; TRISTAN-AR; hardware logic; longitudinal plane; memory function; phase shift; purely analog system; transverse instabilities; two-tap FIR filter system; Clocks; Delay; Digital signal processing; Feedback; Finite impulse response filter; Hardware; Logic; Performance evaluation; Prototypes; System testing;
Conference_Titel :
Particle Accelerator Conference, 1997. Proceedings of the 1997
Conference_Location :
Vancouver, BC
Print_ISBN :
0-7803-4376-X
DOI :
10.1109/PAC.1997.751200
