Effects of neutral-beam injection and gas puffing on deuterium and impurity levels in the scrapeoff layer of ISX-B

Conference · Thu Oct 01 04:00:00 EDT 1981

OSTI ID:6772925

Zuhr, R A; Roberto, J B; Withrow, S P

Plasma-material interactions in the scrapeoff region of a tokamak have important effects on the overall performance of the machine. In order to prudently select the most-appropriate materials for walls, limiters, and armor plate, it is necessary to characterize the plasma that interacts with these surfaces and to understand what effect different modes of operation of the tokamak have on plasma characteristics. We have made a series of measurements on the ISX tokamak using deposition-probe techniques to identify and quantify the impurities (Z greater than or equal to 8) in the limiter shadow, and to determine the temporal behavior of both impurity and plasma particles in this region. These measurements have been made under a variety of tokamak operating conditions, including both ohmic and neutral-beam heated discharges. The results are interpreted in terms of edge conditions, impurity introduction, gas puffing, and the relative importance of wall and limiter contributions.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6772925
• Report Number(s): CONF-810831-96; ON: DE82020920
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700104* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Experimental-- (-1987)
BEAM INJECTION
BOUNDARY LAYERS
DEUTERIUM
DIVERTORS
EROSION
FIRST WALL
FLUID INJECTION
GAS INJECTION
HYDROGEN ISOTOPES
IMPURITIES
ISOTOPES
ISX TOKAMAK
LAYERS
LIGHT NUCLEI
LIMITERS
NEUTRAL ATOM BEAM INJECTION
NUCLEI
ODD-ODD NUCLEI
PLASMA
SHIELDING
SPUTTERING
STABLE ISOTOPES
SURFACES
THERMONUCLEAR REACTOR WALLS
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS