Title :
Control of coupled-bunch instabilities in high-current storage rings
Author_Institution :
Lawrence Berkeley Lab., California Univ., CA, USA
Abstract :
It is noted that intense particle beams may be subject to coupled-bunch instabilities that would grow at rates greater than the bunch oscillation frequencies. The suppression of this growth requires both reduction of the driving impedances and active feedback of bunch motions. The shunt impedances of high-order cavity resonances can be reduced by passive dampers and the beam impedance within the band of the fundamental resonance can be reduced by RF feedback around the cavity and power amplifier. The feedback of bunch motions composed of numerous coupled-bunch modes requires broadband systems for which the amplifiers are costly. Examples proposed for electron storage rings are presented.<>
Keywords :
beam handling techniques; electron accelerators; storage rings; RF feedback; active feedback; broadband systems; bunch motions; bunch oscillation frequencies; coupled-bunch instabilities; driving impedances; electron storage rings; fundamental resonance; high-order cavity resonances; intense particle beams; passive dampers; shunt impedances; Broadband amplifiers; Damping; Feedback; Frequency; Impedance; Optical coupling; Particle beams; Radiofrequency amplifiers; Resonance; Shock absorbers;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.165022
