Noble gas pumping by the TFTR graphite limiter

Conference · Wed Jan 01 00:00:00 EST 1992

OSTI ID:5393686

Ramsey, A T; Manos, D M

The TFTR limiter is graphite. It is possible to decrease the amount of D trapped in the limiter by making plasma discharges with gas injected only as a prefill. When the limiter is deuterium depleted well enough by this technique for supershots (with R{sub D} {approximately} 0.5 {minus} 0.6) it pumps noble gases. The effective confinement time {tau}{sub p}* ranges from {le} 1 s for He down to 0.08 s for Kr. These noble gases escape from the limiter slowly after the run. The partial pressure of Ar and Ne decay with time-constants of several hours, and the data for Ar show evidence of two trapping sites.

• Research Organization: Princeton Univ., NJ (United States). Plasma Physics Lab.
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 5393686
• Report Number(s): PPPL-CFP-2605; CONF-920311-4; ON: DE92012669
• Resource Relation: Conference: 10. international conference on plasma-surface interactions in controlled fusion devices, Monterey, CA (United States), 30 Mar - 3 Apr 1992
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DEUTERIUM
PUMPING
PUMPED LIMITERS
DEGASSING
RARE GASES
CONFINEMENT TIME
GRAPHITE
TFTR TOKAMAK
CARBON
CLOSED PLASMA DEVICES
ELEMENTAL MINERALS
ELEMENTS
FLUIDS
GASES
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
LIMITERS
MINERALS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
STABLE ISOTOPES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700420* - Fusion Technology- Plasma-Facing Components- (1992-)