Vacuum Measuring System on the EAST

The Experimental Advanced Superconducting Tokamak (EAST) is the first whole superconducting divertor tokamak commissioned in the world [1]. The first limiter plasma was obtained in 2006 and the single null and double null divertor plasma in 2007. After the 2nd campaign in 2007 with full metal first walls, the plasma facing components were modified to full doped graphite walls and vacuum system was upgraded to meet the requirement of particles exhaust [23]. The vacuum system is one of the most fundamental and important sub-systems of the EAST. The Vacuum Measuring System (VMS) is required not only for the basic vacuum operation, but also for physics research, such as for wall conditioning, wall retention and divertor physics and so on. The VMS for device and vacuum system operation, wall conditioning and physics research will be introduced, in this paper.