<PLENARY SESSION>ITER VACUUM PUMPING SYSTEM

概要

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Providing the required vacuum conditions and adequate impurity removal from the plasma chamber is crucial to the successful operation of the International Thermonuclear Experimental Reactor (ITER). Recent U.S. efforts on ITER-like devices such as TIBER have examined several design approaches to the vacuum pumping system. For the compact TIBER configuration, which has a fusion power of only about 300 MW, it is possible to design a tritium compatible vacuum system which is all-metal and operates in a throughput, as opposed to hold-up, fashion using existing commercial equipment. Removal of the plasma exhaust during the fusion burn period is the most stringent performance requirement for this system which has a net D-T pumping speed of 25 m^3/s. The TIBER vacuum system design includes 32-turbomolecular pumps which are backed by oil-free, mechanical scroll pumps. Although the ITER vacuum system requirements are not yet fully defined, it appears that the required net pumping speed will be much greater than for TIBER. The TIBER vacuum system design cannot be simply scaled up to a device with a fusion power in the range of 1000 MW since a prohibitively large number of tubomolecular pumps would be required. Therefore, efforts are required to develop hi-speed, regenerable, compound cryopumps and large diameter, all-metal, high vacuum valves for ITER.
核融合科学研究所の論文