Design, analyses and R and D for EAST in-vessel components

In-vessel components are important parts of EAST superconducting tokamak. It is include plasma facing components, passive plates, cryo-pumps, in-vessel coils, etc. The structure optimized design, analyses and related R and D has been complete. Divertor is up down symmetric to accommodate both double null and single null operation. Passive plates can supply around 100 ms time constant during plasma vertical movements. In-vessel coils are used for plasma vertical movements active control. Each cryo-pumps can supply around 45 m3/s pumping speed for particle exhaust. Analyses shows when 1 MA plasma current disrupt in 3 ms EM loads caused by halo current (Ihalo 25%Ip, TPF=2) will not bring unacceptable stress on divertor structure. Graphite tiles bolted to heat sink. Cooling channel consist of holes on heat sink. The bolted divertor thermal structure can sustain 2 MW/m2 up to 60 s operation if we limited first surface temperature 1500 deg C. Thermal testing and structure optimised testing have been made to demonstrate the analyses result. All the in vessel components are under fabrication and components for first plasma will be complete around July 2006. (author)