Title :
RF characteristics of ARES cold models
Author :
Akasaka, N. ; Akai, K. ; Kageyama, T. ; Shintake, T. ; Yamazaki, Yasuyuki
Author_Institution :
Nat. Lab. for High Energy Phys., Ibaraki, Japan
Abstract :
RF characteristics were measured for aluminum 1/5 scale cold models of accelerator resonantly-coupled with an energy storage (ARES) for KEKB. The main purpose of ARES is to reduce the frequency shift due to the detuning of the accelerating cavity. Measurement has shown that the frequency shift of the accelerating (π/2) mode was substantially reduced compared to that of the accelerating cavity itself. Two parasitic modes (0 and π) of ARES have to be damped so that they should not cause longitudinal coupled bunch instability. The coupling waveguides attached at the coupling cavity sufficiently damped these parasitic modes, while having negligible effect on the Q value of the π/2-mode
Keywords :
accelerator RF systems; accelerator cavities; colliding beam accelerators; electron accelerators; particle beam stability; storage rings; tuning; waveguide couplers; 1/5 scale cold models; ARES cold models; KEKB; Q value; RF characteristics; accelerating cavity; coupling cavity; coupling waveguides; detuning; electron storage ring; energy storage; frequency shift; longitudinal coupled bunch instability; parasitic modes; resonantly-coupled accelerator; Acceleration; Aluminum; Damping; Energy storage; Optical coupling; Radio frequency; Resonance; Shock absorbers; Testing; Tuners;
Conference_Titel :
Particle Accelerator Conference, 1995., Proceedings of the 1995
Conference_Location :
Dallas, TX
Print_ISBN :
0-7803-2934-1
DOI :
10.1109/PAC.1995.505345
