Commissioning Status and Plan of SuperKEKB Injector Linac

The SuperKEKB main ring is currently being constructed for aiming at the peak luminosity of 8 x 1035 cm-2s-1. The electron/positron injector linac upgrade is also going on for increasing the intensity of bunch charge with keeping the small emittance. The key upgrade issues are the construction of positron damping ring, a new positron capture system, and a low emittance photocathode rf electron source. The injector linac beam commissioning started in the October of 2013. In this paper, we report the present status and future plan of SuperKEKB injector commissioning.