Speaker
Dr
Shigeki Sasaki
(JASRI/SPring-8)
Description
The RF system of the booster synchrotorn and of the storage ring at SPring-8 is equipped with 1MW CW klystrons. For the booster two klystrons are used and the phase between the two klystrons are changed accorging to the ramping up of the electron energy from 1 GeV to 8 GeV in order to form the accelerating voltage by the vector sum of the two outputs. The power produced by the 2 klystrons are fed to the 8 five-cell cavities to form the accelerating voltage.
For the storage ring, 32 single cell cavities in total are used to compensate the ca. 12-MeV radiation loss. The power consumed as a radiation loss is 1.2 MW, since the stored current is 100 mA. Four RF power stations are distributed evenly around the storage ring. Each station has 8 single cell cavities. Three stasions out of four are equipped with one klystron and remaining one station has two klystrons. The cavities for the storage ring has bell shaped and the radii of outer boundaries are slightly varied from cavity to cavity for them to have different HOM frequency while maintining the accelerating frequency unchanged to avoid strong instabilities induced by the HOM summing up. Furthre, HOM tuners are attached on all the cavities to obtain the flexible countermeasure against the instabilities.
The configuretions of the RF system will be introduced with the experience of the over 10-year period of operation.
Author
Dr
Hiroyasu Ego
(JASRI/SPring-8)
Co-authors
Dr
Shigeki Sasaki
(JASRI/SPring-8)
Takahiro Watanabe
(JASRI/SPring-8)
Mr
Takeo Takashima
(JASRI/SPring-8)
Tsuyoshi Aoki
(JASRI/SPring-8)
Dr
Yuuji Ohashi
(JASRI/SPring-8)
