Initial results from the scoop limiter experiment in PDX

Technical Report · Thu Dec 01 04:00:00 EST 1983

DOI:https://doi.org/10.2172/5420173· OSTI ID:5420173

Budny, R; Bell, M; Bol, K; Boyd, D; Buchenauer, D; Cavallo, A; Couture, P; Crowley, T; Darrow, D; Dylla, F

A particle scoop limiter with a graphite face backed by a 50 liter volume for collecting particles was used in PDX. Experiments were performed to test its particle control and power handling capabilities with up to 5 MW of D/sup 0/ power injected into D/sup +/ plasmas. Line average plasma densities up to 8 x 10/sup 13/ cm/sup -3/ and currents up to 450 kA were obtained. Plasma densities in the scoop channels greater than 2 x 10/sup 13/ cm/sup -3/ and neutral densities in the scoop volume greater than 5 x 10/sup 14/ cm/sup -3/ were observed. There is evidence that recycling may have occurred in the scoop channels for several discharges with large line-averaged plasma density. At beam powers up to 2.5 MW, energy confinement times above 40 ms were deduced from magnetics measurements and from transport analysis. Pressures in the vacuum vessel were in the 10/sup -5/ Torr range, and recycling source neutral densities in the central plasma were low.

• Research Organization: Princeton Univ., NJ (USA). Plasma Physics Lab.
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 5420173
• Report Number(s): PPPL-2061; ON: DE84006285
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700104* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Experimental-- (-1987)
CARBON
CLOSED PLASMA DEVICES
CONFINEMENT
ELEMENTAL MINERALS
ELEMENTS
GRAPHITE
LIMITERS
MINERALS
NONMETALS
PDX DEVICES
PERFORMANCE
PLASMA CONFINEMENT
PLASMA DENSITY
RECYCLING
THERMONUCLEAR DEVICES
TOKAMAK DEVICES