Cryosorption vacuum pumping under fusion reactor conditions [electronic resource].
- Oak Ridge, Tenn. : Oak Ridge National Laboratory, 1977.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
- Physical Description:
- Pages: 5 : digital, PDF file
- Additional Creators:
- Oak Ridge National Laboratory
United States. Department of Energy. Office of Scientific and Technical Information
- Experiments are in progress on cryosorption pumping using a double-chevron pump with a molecular sieve pumping surface. Studies have been made with hydrogen, deuterium, helium, and deuterium-helium at 10/sup -7/ to 3 x 10/sup -3/ torr. Steady pumping speeds were observed for deuterium; above 10/sup -4/ torr the speed increased with pressure until runaway occurred. At less than 10/sup -6/ torr and low panel loading, hydrogen pumping speeds resemble those for deuterium. At higher pressures, the pump can function by condensation or sorption, and unsteady speeds are observed. Helium pumping is always by sorption, but regions of instability have been observed and defined. Deuterium-helium pumping tests showed that deuterium condensation on the panels prevents cryosorption of helium; however, compound pumps with separate panels for helium and hydrogen will be satisfactory.
- Published through SciTech Connect.
7. international Vac. congress and 3. international conference on solid surfaces, Vienna, Austria, 12 Sep 1977.
Watson, J.S.; Fisher, P.W.
- Funding Information:
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