Effect of hydrogen glow discharge conditioning on Zr/Al getter pumps
Zr/Al bulk getter pumps are presently being considered for use in the Tokamak Fusion Test Reactor (TFTR) to reduce impurities and limit the recycling of hydrogenic species. It is necessary that these pumps not be adversely affected by the hydrogen glow discharge cleaning (GDC) which is planned as part of the routine TFTR vessel wall conditioning. The GDC procedure involves the use of a dc glow discharge with a 400 V bias voltage. The total fluence of hydrogenic ions given to the affected surfaces during a typical conditioning period is 10/sup 18/ cm/sup -2/. We have investigated the effects of typical GDC runs on a getter-pump module containing 25 g of Zr/Al mounted in a 100 liter test stand. Pumping speed, capacity, and regeneration characteristics have been studied after various exposures to GDC.
- Research Organization:
- Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08544
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 6496749
- Journal Information:
- J. Vac. Sci. Technol.; (United States), Journal Name: J. Vac. Sci. Technol.; (United States) Vol. 18:3; ISSN JVSTA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing
ALLOYS
ELECTRIC DISCHARGES
ELEMENTS
EQUIPMENT
GETTERS
GLOW DISCHARGES
HIGH VACUUM
HYDROGEN
LABORATORY EQUIPMENT
NONMETALS
PUMPS
SORPTION
TFTR REACTORS
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
VACUUM PUMPS
ZIRCONIUM ALLOYS