Scaling of edge properties with main plasma parameters in Doublet III discharges

Conference · Tue May 01 04:00:00 EDT 1984

OSTI ID:6756413

Kahn, C; Burrell, K H; Fairbanks, E; Petrie, T; Shimada, M; Washizu, M; Sengoku, S

Langmuir probes have been used extensively in Doublet III to diagnose edge and divertor plasma properties. Previous measurements made by probe and thermocouple arrays in expanded boundary discharges have yielded estimates of neutralizer plate power loading, edge electron temperature and edge ion density. These successful diagnostic measurements have prompted both the extension of the arrays to cover almost the entire poloidal contour of Doublet III, and the installation of a movable, upper axis Langmuir probe. The enhanced system permits the diagnosis of the main plasma scrape-off layer and the plasma at the neutralizer plates. A second movable Langmuir probe has been used to determine the scaling of parameters in the divertor throat. Data from these and other diagnostics are presented. Divertor plate power loading, the effect of fluctuations and the scaling of edge plasma parameters are addressed. Profiles of plasma parameters across the main plasma scrape-off layer, the divertor throat and the divertor plates are also given.

• Research Organization: GA Technologies, Inc., San Diego, CA (USA); Japan Atomic Energy Research Inst., Tokai, Ibaraki
• DOE Contract Number: AT03-84ER51044; AT03-80SF11512
• OSTI ID: 6756413
• Report Number(s): GA-A-17576; CONF-840520-12; ON: DE84013841
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700104* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Experimental-- (-1987)
BOUNDARY LAYERS
DIVERTORS
DOUBLET REACTORS
ELECTRIC PROBES
ELECTRON TEMPERATURE
ION DENSITY
LANGMUIR PROBE
LAYERS
PLASMA DIAGNOSTICS
PLASMA SHEATH
PROBES
SCALING LAWS
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS