skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Characterization and conditioning of SSPX plasma facing surfaces

Abstract

The Sustained Spheromak Physics Experiment (SSPX) will examine the confinement properties of spheromak plasmas sustained by DC helicity injection. Understanding the plasma-surface interactions is an important component of the experimental program since the spheromak plasma is in close contact with a stabilizing wall (flux conserver) and is maintained by a high-current discharge in the coaxial injector region. Peak electron temperatures in the range of 400 eV are expected, so the copper plasma facing surfaces in SSPX have been coated with tungsten to minimize sputtering and plasma contamination. Here the authors report on the characterization and conditioning of these surfaces used for the initial studies of spheromak formation in SSPX. The high-pressure plasma-sprayed tungsten facing the SSPX plasma was characterized in-situ using beta-backscattering and ex-situ using laboratory measurements on similarly prepared samples. Measurements indicate that water can be desorbed effectively through baking while hydrocarbon/oxide removal using glow discharge and shot conditioning is slow due to the coating's high porosity.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
756906
Report Number(s):
SAND2000-8728C
TRN: US0003867
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Conference
Resource Relation:
Conference: 14th International Conference on Plasma Surface Interactions, Rosenheim (DE), 05/22/2000--05/26/2000; Other Information: PBD: 22 May 2000
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; SSPX DEVICE; THERMONUCLEAR REACTOR MATERIALS; THERMONUCLEAR REACTOR WALLS; PROTECTIVE COATINGS; DESORPTION; POROSITY; ATOM TRANSPORT

Citation Formats

D. Buchenauer, B. E. Mills, R. Wood, S. Woodruff, D. N. Hill, E. B. Hooper, and D. F. Cowgill. Characterization and conditioning of SSPX plasma facing surfaces. United States: N. p., 2000. Web.
D. Buchenauer, B. E. Mills, R. Wood, S. Woodruff, D. N. Hill, E. B. Hooper, & D. F. Cowgill. Characterization and conditioning of SSPX plasma facing surfaces. United States.
D. Buchenauer, B. E. Mills, R. Wood, S. Woodruff, D. N. Hill, E. B. Hooper, and D. F. Cowgill. Mon . "Characterization and conditioning of SSPX plasma facing surfaces". United States.
@article{osti_756906,
title = {Characterization and conditioning of SSPX plasma facing surfaces},
author = {D. Buchenauer and B. E. Mills and R. Wood and S. Woodruff and D. N. Hill and E. B. Hooper and D. F. Cowgill},
abstractNote = {The Sustained Spheromak Physics Experiment (SSPX) will examine the confinement properties of spheromak plasmas sustained by DC helicity injection. Understanding the plasma-surface interactions is an important component of the experimental program since the spheromak plasma is in close contact with a stabilizing wall (flux conserver) and is maintained by a high-current discharge in the coaxial injector region. Peak electron temperatures in the range of 400 eV are expected, so the copper plasma facing surfaces in SSPX have been coated with tungsten to minimize sputtering and plasma contamination. Here the authors report on the characterization and conditioning of these surfaces used for the initial studies of spheromak formation in SSPX. The high-pressure plasma-sprayed tungsten facing the SSPX plasma was characterized in-situ using beta-backscattering and ex-situ using laboratory measurements on similarly prepared samples. Measurements indicate that water can be desorbed effectively through baking while hydrocarbon/oxide removal using glow discharge and shot conditioning is slow due to the coating's high porosity.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: