Method of neutral density determination near the X-point in DIII-D

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A new method for determining the density of neutrals near the X-point of a diverted plasma is described. Code calculations have predicted that the neutral density peaks poloidally near the X-piont and there is evidence that neutrals play a role in the L-H transition and in damping the plasma rotation. The new method uses D{sub {alpha}} data from a tangentially-viewing video camera calibrated by a vertically-viewing photomultiplier. These data, combined with electron temperature and density measurements from the divertor Thomson scattering (DTS) system, provide sufficient informatino to determine the neutral density in the X-point region of DIII-D. Preliminary results show ... continued below

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5 p.

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Colchin, R.J.; Maingi, R.; Isler, R.C.; Owen, L.W.; Fenstermacher, M.E. & Carlstrom, T.N. July 1, 1998.

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Description

A new method for determining the density of neutrals near the X-point of a diverted plasma is described. Code calculations have predicted that the neutral density peaks poloidally near the X-piont and there is evidence that neutrals play a role in the L-H transition and in damping the plasma rotation. The new method uses D{sub {alpha}} data from a tangentially-viewing video camera calibrated by a vertically-viewing photomultiplier. These data, combined with electron temperature and density measurements from the divertor Thomson scattering (DTS) system, provide sufficient informatino to determine the neutral density in the X-point region of DIII-D. Preliminary results show neutral densities above the X-point are order 10{sup 10}--10{sup 11} atomscm{sup 3}. The diagnostics used to determine these neutral densities, the data analysis method, and preliminary results are described in this paper.

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5 p.

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INIS; OSTI as DE98007254

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  • 25. European Physical Society conference on controlled fusion and plasma physics, Prague (Czech Republic), 29 Jun - 3 Jul 1998

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  • Other: DE98007254
  • Report No.: GA--A22902
  • Report No.: CONF-980678--
  • Grant Number: AC03-89ER51114;W-7405-ENG-48;AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 661746
  • Archival Resource Key: ark:/67531/metadc702861

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  • July 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Aug. 3, 2016, 1:50 p.m.

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Colchin, R.J.; Maingi, R.; Isler, R.C.; Owen, L.W.; Fenstermacher, M.E. & Carlstrom, T.N. Method of neutral density determination near the X-point in DIII-D, article, July 1, 1998; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc702861/: accessed December 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.