Time-resolved impurity fluxes in the TEXTOR plasma edge

Conference · Sun Jan 01 04:00:00 EST 1984

OSTI ID:6332352

Zuhr, R A; Wampler, W R

The internal configuration of the TEXTOR Tokamak at KFA Julich, FRG, has been modified recently to include antennas for ICRH heating of the plasma. Passive deposition probe measurements of edge impurity fluxes were made for typical ohmic discharges with this new liner configuration. The time-resolved behavior of impurities in the edge was determined as a function of radius and limiter position using rotating probe techniques. The dominant metallic impurities were found to be iron and the other components of stainless steel. Average deposited iron fluxes circulating along the field lines were found to be approx. 10/sup 15//cm/sup 2/ s at 5 cm behind the limiter radius. Radial profiles of the impurities demonstrate a characteristic decrease with increasing radius outside the limiters and show an e-folding length of approx. 2.5 cm. The limiting effects of the rf antenna are also evident in the radial profiles. Present results are compared with previous measurements of edge fluxes made prior to the modifications to the plasma-side liner of TEXTOR.

• Research Organization: Oak Ridge National Lab., TN (USA); Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6332352
• Report Number(s): SAND-84-1462C; CONF-841218-4; ON: DE85000414
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700104* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Experimental-- (-1987)
ANTENNAS
BOUNDARY LAYERS
CLOSED PLASMA DEVICES
ELECTRICAL EQUIPMENT
EQUIPMENT
HEATING
HIGH-FREQUENCY HEATING
ICR HEATING
IMPURITIES
LAYERS
PLASMA HEATING
PLASMA SCRAPE-OFF LAYER
PLASMA SHEATH
TEXTOR TOKAMAK
THERMONUCLEAR DEVICES
TOKAMAK DEVICES