The component improvement of the SPring-8 linac

In FY2013, the total operation time of SPring-8 injector linac were 4328.3 hours. The total downtime was 0.13% (The frequency of fault was 0.22 times per day) and as stable as the last few years. We modified the timing system of linac and NS to change the beam routes every 0.5 seconds. NS timing system was changed to synchronize with that of Sy and gun trigger signals were modified to get time-shared for Sy and NS. These modifications were completed successfully in 2013 and realized no wait injection of SR and NS. A pressurized SF6 waveguide system was replaced with a vacuum waveguide system including newly developed S-band vacuum circulators and isolators in the 2013 fiscal year. (author)