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Title: Particle Control in the Sustained Spheromak Physics Experiment

Abstract

In this paper we report on density and impurity measurements in the Sustained Spheromak Physics Experiment (SSPX) which has recently started operation. The SSPX spheromak plasma is sustained by coaxial helicity injection for a duration of 2msec with peak toroidal currents of up to 0.5MA. The plasma-facing components consist of tungsten-coated copper to minimize sputtering. The surfaces are conditioned by a combination of baking at 150 C, glow discharge cleaning, Titanium gettering, and pulse-discharge cleaning with helium plasmas. In this way we can achieve density control so that the plasma density ({approx} 1-4 x 10{sup 20}m{sup -3}) matches the gas input. Low-density operation is presently limited by breakdown requirements, but we hope that new gas valves with supersonic nozzles will allow for a further reduction in density. We find that the conditioning reduces the impurity radiation to the point where it is no longer important to the energy balance, and long-lived spheromak plasmas are obtained (decay times of 1.5msec).

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
USDOE Office of Defense Programs (DP) (US)
OSTI Identifier:
791739
Report Number(s):
UCRL-JC-139018
Journal ID: ISSN 0022-3115; TRN: US0301510
DOE Contract Number:  
W-7405-Eng-48
Resource Type:
Conference
Resource Relation:
Journal Volume: 290-293; Conference: 14th International Conference on Plasma Surface Interactions, Rosenheim (DE), 05/22/2000--05/26/2000; Other Information: PBD: 1 May 2000
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; COPPER; ENERGY BALANCE; GETTERING; GLOW DISCHARGES; HELICITY; HELIUM; NOZZLES; PHYSICS; PLASMA DENSITY; RADIATIONS; SPUTTERING; TITANIUM; VALVES

Citation Formats

Wood, R D, Hill, D N, Hooper, E B, Buchenauer, D, McLean, H, Wang, Z, Woodruff, S, and Wurden, G. Particle Control in the Sustained Spheromak Physics Experiment. United States: N. p., 2000. Web. doi:10.1016/S0022-3115(00)00444-X.
Wood, R D, Hill, D N, Hooper, E B, Buchenauer, D, McLean, H, Wang, Z, Woodruff, S, & Wurden, G. Particle Control in the Sustained Spheromak Physics Experiment. United States. doi:10.1016/S0022-3115(00)00444-X.
Wood, R D, Hill, D N, Hooper, E B, Buchenauer, D, McLean, H, Wang, Z, Woodruff, S, and Wurden, G. Mon . "Particle Control in the Sustained Spheromak Physics Experiment". United States. doi:10.1016/S0022-3115(00)00444-X. https://www.osti.gov/servlets/purl/791739.
@article{osti_791739,
title = {Particle Control in the Sustained Spheromak Physics Experiment},
author = {Wood, R D and Hill, D N and Hooper, E B and Buchenauer, D and McLean, H and Wang, Z and Woodruff, S and Wurden, G},
abstractNote = {In this paper we report on density and impurity measurements in the Sustained Spheromak Physics Experiment (SSPX) which has recently started operation. The SSPX spheromak plasma is sustained by coaxial helicity injection for a duration of 2msec with peak toroidal currents of up to 0.5MA. The plasma-facing components consist of tungsten-coated copper to minimize sputtering. The surfaces are conditioned by a combination of baking at 150 C, glow discharge cleaning, Titanium gettering, and pulse-discharge cleaning with helium plasmas. In this way we can achieve density control so that the plasma density ({approx} 1-4 x 10{sup 20}m{sup -3}) matches the gas input. Low-density operation is presently limited by breakdown requirements, but we hope that new gas valves with supersonic nozzles will allow for a further reduction in density. We find that the conditioning reduces the impurity radiation to the point where it is no longer important to the energy balance, and long-lived spheromak plasmas are obtained (decay times of 1.5msec).},
doi = {10.1016/S0022-3115(00)00444-X},
journal = {},
issn = {0022-3115},
number = ,
volume = 290-293,
place = {United States},
year = {2000},
month = {5}
}

Conference:
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