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

Volume

3

fYear

1995

fDate

1-5 May 1995

Firstpage

1738

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1995., Proceedings of the 1995

Conference_Location

Dallas, TX

Print_ISBN

0-7803-2934-1

Type

conf

DOI

10.1109/PAC.1995.505345

Filename

505345