Metal impurity release in diverted tokamak discharges

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5727586

Staudenmaier, G; Wampler, W R

Plasma materials interaction at the wall of the main plasma chamber of the divertor tokamak ASDEX was investigated by a combined probe, allowing simultaneous measurements of the erosion rate by neutral particles, and the flux and average energy of neutrals. The erosion was measured by collecting part of the released material on a carbon strip. Subsequent surface analysis was performed by electron induced x-ray analysis. Flux and energy of the impinging neutral particles were measured after each single discharge with an energy resolving carbon resistance probe. Such combined measurements yield the erosion yield being characteristic for the erosion process. Data for ohmic discharges in deuterium and helium are compared. It turns out that the carbon resistance probe is a simple but powerful means to study the metal impurity release from the tokamak walls by charge exchange neutrals.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA); Max-Planck-Institut fuer Plasmaphysik, Garching (Germany, F.R.)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5727586
• Report Number(s): SAND-86-0039C; CONF-860522-14; ON: DE86012174
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700104* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Experimental-- (-1987)
ASDEX TOKAMAK
CARBON
CHARGE EXCHANGE
CLOSED PLASMA DEVICES
DIVERTORS
ELEMENTS
EROSION
FIRST WALL
IMPURITIES
NONMETALS
PROBES
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTOR WALLS
TOKAMAK DEVICES