Fig. 1. Operational statistics since 1997. 1997 1998 1999 2000 1997 1998 1999 2000 0 6000 5000 4000 3000 2000 1000 Tuning ( Accel. & BL ) Injection Failure User time 1286 4189.6 5051.6 304 1457.6 1624.2 1815 95.2 50 110 70.4 3275 2512 906 3193.4 26 110 57.2 88.7 5167.5 Hours The beam commissioning of the SPring-8 storage ring begun on March 13, 1997. The operation statistics for the last four years are shown in Fig. 1 . In 2000, the SPring-8 storage ring was operated on three- or four- we ek pe ri od fo r on e cy cl e. Th e to ta l op er at io n ti me wa s ap pr ox im at el y 50 00 ho ur s. Ab ou t 67 % of th e operation time was available to the users and the remaining 33% was dedicated for: (i) the machine study, ( ii ) the machine and beamline tuning, ( iii ) the commissioning of the new optics ( Phase-II optics), and ( iv ) the commissioning of new photon beamlines. Three different filling patterns were delivered to the user time; 53.5% in the multi-bunch mode operation, 30.7% in the several bunch mode such as 29 equally spaced 9-, 11- or 15-bunch trains, and the remaining 15.7% in the hybrid filling mode such as a 2/29-partially filled multi-bunch with 26-isolated bunches. For the hybrid filling mode, 1 or 1.5 mA is stored in each isolated bunch, with impurity level of 10 -7 being routinely kept in the user time.
home
- JP
- EN