Cryopump, neutral-beam compatibility test

Abstract

The design and performance testing plan for a cryopump to be used on the TFTR neutral beams injectors are briefly discussed. The cryopump consists of an outer envelope at liquid nitrogen temperature, and an inner envelope at liquid helium temperature. In the cryopanel-chevron structure to be tested, a deuterium condensation rate of 2.5 x 10/sup 4/ liters/s is predicted. A three phase test plan for performance testing at both LBL and LLL is delineated. (RME