Neutral particle transport in a tokamak toroidal belt pump limiter

Journal Article · Tue May 01 00:00:00 EDT 1990 · Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA)

DOI:https://doi.org/10.1116/1.576846· OSTI ID:6764714

Corbett, W J; Conn, R W ^[1]; Reiter, D; Dippel, K H; Finken, K H ^[2]

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1. Institute of Plasma and Fusion Research, University of California, Los Angeles, CA (USA)
2. Kernforschungsanlage Juelich, GmbH, Postfach D-5170 (Federal Republic of Germany)

The Advanced Limiter Test-II (ALT-II) is an experimental toroidal belt pump limiter in the TEXTOR tokamak. This configuration is designed to study power and particle removal capabilities of the toroidal limiter during the long pulse (4 s), high power (7 MW) tokamak discharges. Probe measurements of plasma parameters in the limiter shadow are used to calibrate the incident ion flux. Neutral gas pressure and particle throughput to the pumps are measured with Bayard--Alpert gauges. In the ohmic phase, the plasma density in the limiter scoops is 3 to 8{times}10{sup 11} cm{sup {minus}3}, electron temperatures are 8 to 12 eV, and the neutral pressure can reach 0.5 mTorr. Numerical calculations show that the background plasma influences atomic and molecular gas transport in the scoops, and the estimated particle removal rates agree with experimental measurements under ohmic (0.1--0.2 Torr l/s) and high flux conditions with neutral beam injection (NBI) ({gt}1.0 Torr l/s).

• DOE Contract Number: FG03-85ER51069
• OSTI ID: 6764714
• Journal Information: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA), Journal Name: Journal of Vacuum Science and Technology, A (Vacuum, Surfaces and Films); (USA) Journal Issue: 3 Vol. 8:3; ISSN JVTAD; ISSN 0734-2101
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700209* -- Fusion Power Plant Technology-- Component Development & Materials Testing
CLOSED PLASMA DEVICES
ELECTRON TEMPERATURE
LIMITERS
NEUTRAL-PARTICLE TRANSPORT
PLASMA DENSITY
PLASMA DIAGNOSTICS
PUMPED LIMITERS
RADIATION TRANSPORT
REMOVAL
TEXTOR TOKAMAK
THERMONUCLEAR DEVICES
TOKAMAK DEVICES