Bias-sustained shield plasma

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Divertor biasing may provide a method for density and impurity control by enhancing the shielding efficiency of the scrape-off layer. The idea is to make the scrape-off plasma denser and thicker by heating it with a bias-driven current, and by inducing a radial E [times] B drift. If the bias is applied to flux surfaces at the outer edge of the usual scrape-off layer, a new layer of plasma can be added which is sustained by the bias-supplied power. A simple theoretical model will be presented which shows that there is a threshold condition which must be satisfied in order ... continued below

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Pages: (13 p)

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Staebler, G.M.; Hyatt, A.W.; Schaffer, M.J. & Mahdavi, M.A. September 1, 1992.

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Description

Divertor biasing may provide a method for density and impurity control by enhancing the shielding efficiency of the scrape-off layer. The idea is to make the scrape-off plasma denser and thicker by heating it with a bias-driven current, and by inducing a radial E [times] B drift. If the bias is applied to flux surfaces at the outer edge of the usual scrape-off layer, a new layer of plasma can be added which is sustained by the bias-supplied power. A simple theoretical model will be presented which shows that there is a threshold condition which must be satisfied in order for the bias-heated plasma to be self-sustaining. The bias-sustained plasma must also be opaque enough to neutrals in order for it to be fueled by a gas puff, which means that it win serve as a shield to the core plasma against neutral impurities and hydrogen. Experiments performed on DIII-D have demonstrated both a modification of the central nickel impurity concentration and an increase in the ionization of hydrogen within the scrape-off layer due to biasing.

Physical Description

Pages: (13 p)

Notes

OSTI; NTIS; INIS; GPO Dep.

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  • International Atomic Energy Agency (IAEA) technical committee meeting on tokamak plasma biasing, Montreal (Canada), 8-10 Sep 1992

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  • Other: DE93001908
  • Report No.: GA-A-21041
  • Report No.: CONF-9209181--2
  • Grant Number: AC03-89ER51114
  • Office of Scientific & Technical Information Report Number: 6911888
  • Archival Resource Key: ark:/67531/metadc1188331

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Office of Scientific & Technical Information Technical Reports

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

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • September 1, 1992

Added to The UNT Digital Library

  • July 2, 2018, 10:52 p.m.

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  • July 25, 2018, 1:14 p.m.

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Staebler, G.M.; Hyatt, A.W.; Schaffer, M.J. & Mahdavi, M.A. Bias-sustained shield plasma, article, September 1, 1992; United States. (https://digital.library.unt.edu/ark:/67531/metadc1188331/: accessed March 24, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.