Cryosorption pumping of deuterium by MS-5A at temperatures above 4. 2 K for fusion reactor applications

Conference · Sat Jan 01 04:00:00 EST 1977

OSTI ID:5364642

Fisher, P W; Watson, J S

An Excalibur CVR-1106 cryosorption pump was fitted with a special cooling system to permit measurement of deuterium pumping speeds at temperatures between 6 and 20/sup 0/K. Pumping speeds were found to be a function of feed rate, loading prior to each run, loading during runs, and thermal treatment between runs. At feed rates < 3 x 10/sup -4/ Torr-l s/sup -1/cm/sup -2/, speeds were near 1 l s/sup -1/ cm/sup -2/ initially and declined monotonically with loading. At high feed rates, speeds reached a higher maximum (approx. 3 l s/sup -1/ cm/sup -2/) but also generally declined with loading; however, after 50 to 100 Torr l had accumulated, the pump underwent a spontaneous transition which effected a return to the original (high) pumping speed. This transition was accompanied by pressure spikes in the test chamber and temperature spikes in the sieve panel. Initial speeds for each consecutive run equaled the final speed for the preceding run if the pump was maintained at operating temperature; however, if it was warmed to 77/sup 0/K and recooled, a restoration to the maximum speed was observed at the beginning of the next run.

• Research Organization: Oak Ridge National Lab., Tenn. (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5364642
• Report Number(s): CONF-771110-8
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700209* -- Fusion Power Plant Technology-- Component Development &amp; Materials Testing
BREEDING BLANKETS
CRYOPUMPS
DEUTERIUM
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
HYDROGEN ISOTOPES
ISOTOPES
LABORATORY EQUIPMENT
LIGHT NUCLEI
NEUTRAL BEAM SOURCES
NUCLEI
ODD-ODD NUCLEI
PERFORMANCE
PUMPS
REACTOR COMPONENTS
STABLE ISOTOPES
THERMONUCLEAR REACTORS
VACUUM PUMPS
VACUUM SYSTEMS