Characterization and conditioning of SSPX plasma facing surfaces

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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 ... continued below

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20 p.

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Buchenauer, D.; Mills, B. E.; Wood, R.; Woodruff, S.; Hill, D. N.; Hooper, E. B. et al. May 22, 2000.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

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.

Physical Description

20 p.

Notes

INIS; OSTI as DE00756906

Medium: P; Size: 20 pages

Source

  • 14th International Conference on Plasma Surface Interactions, Rosenheim (DE), 05/22/2000--05/26/2000

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  • Report No.: SAND2000-8728C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 756906
  • Archival Resource Key: ark:/67531/metadc701987

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • May 22, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 7, 2017, 7:12 p.m.

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Buchenauer, D.; Mills, B. E.; Wood, R.; Woodruff, S.; Hill, D. N.; Hooper, E. B. et al. Characterization and conditioning of SSPX plasma facing surfaces, article, May 22, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc701987/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.