Impact of edge current density and pressure gradient on the stability of DIII-D high performance discharges

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One of the major goals of advanced tokamak research is to develop plasma configurations with good confinement and improved stability at high {beta}. In DIII-D, various high performance configurations with H- and VH-mode edges have been produced. These include discharges with poloidal cross sections in the forms of dee and crecent shapes, single- and double-null divertors, and with various central magnetic shear profiles and current profile peakedness. All these discharges exhibit confinement in the outer plasma region which leads to a large edge pressure gradient and a large edge bootstrap current driven by this steep pressure gradient. These edge conditions ... continued below

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7 p.

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Lao, L. L.; Ferron, J. R. & Strait, E. J. June 1997.

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One of the major goals of advanced tokamak research is to develop plasma configurations with good confinement and improved stability at high {beta}. In DIII-D, various high performance configurations with H- and VH-mode edges have been produced. These include discharges with poloidal cross sections in the forms of dee and crecent shapes, single- and double-null divertors, and with various central magnetic shear profiles and current profile peakedness. All these discharges exhibit confinement in the outer plasma region which leads to a large edge pressure gradient and a large edge bootstrap current driven by this steep pressure gradient. These edge conditions often drive an instability near the edge region which can severely degrade the discharge performance. An understanding of this edge instability is essential to sustain an enhance discharge performance.

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7 p.

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INIS; OSTI as DE97007895

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  • 24. EPS conference on controlled fusion and plasma physics, Berchtesgaden (Germany), 9-13 Jun 1997

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  • Other: DE97007895
  • Report No.: GA--A22640
  • Report No.: CONF-9706131--11
  • Grant Number: AC03-89ER51114;AC05-96OR22464;FG02-89ER53297;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 516025
  • Archival Resource Key: ark:/67531/metadc692672

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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.

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  • June 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 18, 2016, 4:06 p.m.

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Lao, L. L.; Ferron, J. R. & Strait, E. J. Impact of edge current density and pressure gradient on the stability of DIII-D high performance discharges, article, June 1997; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc692672/: accessed April 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.