Control System Upgrade for SuperKEKB Injector Linac

The KEKB project has successfully ended 13 years operation in the June of 2010. The construction of SuperKEKB main ring has almost completed for aiming at the peak luminosity of 8 x 1035 cm-2s-1. The injector linac upgrade is also going on for increasing the intensity of bunched charge with keeping the small emittance. The key upgrade issues are the stable operation of a new positron capture system, a low emittance photo-cathode rf electron source, and the establishment of low emittance preservation. The injector linac beam commissioning started in the October of 2013. The control system performance determines the beam operation efficiency of injector linac, and it eventually has a strong impact on the experimental results of physics. In this decade, the linac control system has been gradually transferred from the inhouse system to the Experimental Physics and Industrial Control System based one for the high availability of beam operation. In this paper, we present the detail of SuperKEKB injector linac control system.