Development of Cryosorption Panels for Cryopumps
Liquid-helium cooled cryosorption panels have been developed in Karlsruhe for plasma exhaust pumping in tokamaks. A variety of material combinations (sorbent/bonding/substrate) and various coating techniques have been compared in an extensive testing programme. A technology suitable for machine coating of large surfaces has been developed applying injector nozzles for spraying of bonding and sorbent materials. Inorganic cements have been selected for bonding activated carbon or molecular sieve particles, 10µm to 2 mm grain size, to metal substrates. The cryosorption panels prepared in this way are capable of pumping simulated tokamak exhaust gas mixtures including deuterium, helium and impurities at pumping speeds of up to 8 L/(s cm2) and pumping pressures < 10-2 mbar. In this paper the development of the coating technology and some results of panel testing are described.
KeywordsQuartz Dust Argon Helium Titan
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