Design, Analysis and R&D of the EAST In-Vessel Components

In-vessel components are important parts of the EAST superconducting tokamak.They include the plasma facing components,passive plates,cryo-pumps,in-vessel coils,etc.Thestructural design,analysis and related R&D have been completed.The divertor is designed inan up-down symmetric configuration to accommodate both double null and single null plasmaoperation.Passive plates are used for plasma movement control.In-vessel coils are used forthe active control of plasma vertical movements.Each cryo-pump can provide an approximately45 m;/s pumping rate at a pressure of 10;Pa for particle exhaust.Analysis shows that,when aplasma current of 1 MA disrupts in 3 ms,the EM loads caused by the eddy current and the halocurrent in a vertical displacement event （VDE） will not generate an unacceptable stress on thedivertor structure.The bolted divertor thermal structure with an active cooling system can sustaina load of 2 MW/m;up to a 60 s operation if the plasma facing surface temperature is limited to1500 ℃.Thermal testing and structural optimization testing were conducted to demonstrate theanalysis results.