Stable top-up operation at SPring-8.
Top-up operation allows SPring-8 to provide highly stable X-ray beams with arbitrary filling patterns. The implementation of top-up operation is described, with a focus on the simultaneous achievement of stability of stored current, beam orbit, purity of an isolated single bunch, and beam injection efficiency. Stored-current fluctuations have been routinely reduced to a level of 10(-3). Stored-beam oscillation on frequent beam injection, which was originally regarded as the most serious problem, has been successfully suppressed to a sufficiently low level that it never perturbs imaging experiments. Current impurities in nominally empty buckets have been reduced to a level of 10(-9) over more than one week of operation, making possible the measurement of time-resolved spectra using high-current bunches. Finally, excellent injection efficiency, higher than 80%, is routinely obtained, even for small undulator gaps, which is critical for preventing radiation damage to insertion-device magnets and to reduce leakage radiation. The process of achieving highly stabilized top-up operation at SPring-8 and its utility for user experiments are described.
Tanaka
Hitoshi
H
Japan Synchrotron Radiation Research Institute/SPring-8, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan. tanaka@spring8.or.jp
Adachi
Masatoshi
M
Aoki
Tsuyoshi
T
Asaka
Takao
T
Baron
Alfred
A
Daté
Shin
S
Fukami
Kenji
K
Furukawa
Yukito
Y
Hanaki
Hirofumi
H
Hosoda
Naoyasu
N
Ishikawa
Tetsuya
T
Kimura
Hiroaki
H
Kobayashi
Kazuo
K
Kobayashi
Toshiaki
T
Kohara
Shinji
S
Kumagai
Noritaka
N
Masaki
Mitsuhiro
M
Masuda
Takemasa
T
Matsui
Sakuo
S
Mizuno
Akihiko
A
Nakamura
Takeshi
T
Nakatani
Takeshi
T
Noda
Takashi
T
Ohata
Toru
T
Ohkuma
Haruo
H
Ohshima
Takashi
T
Oishi
Masaya
M
Sasaki
Sigeki
S
Schimizu
Jun
J
Shoji
Masazumi
M
Soutome
Kouichi
K
Suzuki
Motohiro
M
Suzuki
Shinsuke
S
Suzuki
Yoshio
Y
Takano
Shirou
S
Takao
Masaru
M
Takashima
Takeo
T
Takebe
Hideki
H
Takeuchi
Akihisa
A
Tamura
Kazuhiro
K
Tanaka
Ryotaro
R
Tanaka
Yoshihito
Y
Taniuchi
Tsutomu
T
Taniuchi
Yukiko
Y
Tsumaki
Kouji
K
Yamashita
Akihiro
A
Yanagida
Kenichi
K
Yoda
Yoshitaka
Y
Yonehara
Hiroto
H
Yorita
Tetsuhiko
T
Yoshioka
Masamichi
M
Takata
Masaki
M
D004583:Electrons; D004867:Equipment Design; D006358:Hot Temperature; D008280:Magnetics; D009991:Oscillometry; D010315:Particle Accelerators; D012542:Scattering, Radiation; D012822:Silicon Dioxide; D017356:Synchrotrons; D013696:Temperature; D013997:Time Factors; D014965:X-Rays
D012822:Silicon Dioxide