Title :
Vacuum conditioning and beam lifetime of the SPring-8 storage ring
Author :
Kumagai, N. ; Noda, T. ; Ohkuma, H. ; Oishi, M. ; Saeki, H. ; Soutome, K. ; Suzuki, Y. ; Takao, M. ; Tanaka, H. ; Taniuchi, Y. ; Watanabe, K.
Author_Institution :
JASRI, Hyogo, Japan
Abstract :
The installation of the vacuum system of the SPring-8 storage ring was completed during 1996. Most of the vacuum chambers are made of aluminum alloy. The main pumping system is a mixed one consisting of NEG strips, DIP, SIP, and LNP. In addition to the standard treatments for ultrahigh vacuum components, a dust-controlled procedure was adopted in the manufacturing and the installation processes. Beam commissioning of the SPring-8 storage ring started in March 1997. Since then an integrated beam dose of 190 Ah has been achieved up to now, and correspondingly, the dynamic pressure rise per stored beam current (P/I) decreased by two orders of magnitude. In the multi-bunch mode a lifetime of 65 hours at 70 mA were achieved after two years´ operation
Keywords :
electron accelerators; particle beam bunching; particle beam stability; storage rings; vacuum pumps; 2 y; 65 h; 70 mA; SPring-8 storage ring; beam commissioning; beam lifetime; dust-controlled procedure; multibunch mode; pumping system; ultrahigh vacuum components; vacuum chambers; vacuum conditioning; vacuum system; Aluminum alloys; Electronics packaging; Electrons; Laser excitation; Storage rings; Strips; Strontium; Thermal conductivity; Vacuum systems; Valves;
Conference_Titel :
Particle Accelerator Conference, 1999. Proceedings of the 1999
Conference_Location :
New York, NY
Print_ISBN :
0-7803-5573-3
DOI :
10.1109/PAC.1999.792688
