RF system for the STA SR ring

Author

Kusaka, T. ; Yoshiyuki, T. ; Miura, A. ; Hara, M.

Author_Institution

RIKEN-JAERI Synchrotron Radiat. Facility Design Team, Tokyo, Japan

fYear

1989

fDate

20-23 Mar 1989

Firstpage

180

Abstract

The RF system for the STA (Science and Technology Agency of Japan) 8-GeV storage ring consists of four 1-Mw klystrons and 508-MHz cavities, which are located in four 6.5-m straight sections with low betatron functions. The accelerating voltage amounts to 12 MV to compensate for the energy loss due to synchrotron radiation in bending magnets (8.3 MeV) and in insertion devices (3.2 MeV) and parasitic energy loss (0.5 MeV). An overvoltage ratio of 1.33 gives a sufficient quantum lifetime. Since 32 single-cell cavities or 14 three-cell cavities are used in this RF system, a single-cell cavity and a three-cell cavity, in which each cell is coupled with off-axis slots, were studied. The RF characteristics were calculated with the computer codes developed in RIKEN and were measured by using model cavities. Methods to overcome the coupled-bunch instabilities are taken for a beam current of 100 mA

Keywords

beam handling equipment; physics computing; storage rings; RF system; RIKEN; STA SR ring; accelerating voltage; bending magnets; computer codes; coupled-bunch instabilities; energy loss; insertion devices; klystrons; off-axis slots; overvoltage ratio; parasitic energy loss; quantum lifetime; single-cell cavities; storage ring; straight sections; synchrotron radiation; three-cell cavities; Acceleration; Energy loss; Klystrons; Magnets; Optical coupling; Radio frequency; Storage rings; Strontium; Synchrotron radiation; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1989. Accelerator Science and Technology., Proceedings of the 1989 IEEE

Conference_Location

Chicago, IL

Type

conf

DOI

10.1109/PAC.1989.73114

Filename

73114