Detached divertor operation in DIII-D helium plasmas

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This paper presents results from operating helium plasmas in DIII-D in which helium gas puffing is used to reduce the peak divertor heat flux by factors of four or more. The threshold density for achieving these conditions is nearly the same as for deuterium plasmas, which is surprising given the fact that lack of chemical sputtering reduces the carbon concentration in the plasma by more than a factor of five. Spectroscopic analysis shows that helium becomes the primary radiation in these plasmas, which is possible because, unlike carbon, it is the primary species present. These plasmas differ from the usual ... continued below

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17 p.

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Hill, D. N., LLNL May 1, 1998.

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Description

This paper presents results from operating helium plasmas in DIII-D in which helium gas puffing is used to reduce the peak divertor heat flux by factors of four or more. The threshold density for achieving these conditions is nearly the same as for deuterium plasmas, which is surprising given the fact that lack of chemical sputtering reduces the carbon concentration in the plasma by more than a factor of five. Spectroscopic analysis shows that helium becomes the primary radiation in these plasmas, which is possible because, unlike carbon, it is the primary species present. These plasmas differ from the usual partially detached divertor (PDD) plasmas in that there is no concomitant reduction in target plate ion flux with target plate heat flux in the scrape off later outside the separatrix.

Physical Description

17 p.

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OSTI as DE98058595

Other: FDE: PDF; PL:

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  • 13. international conference on plasma surface interactions, San Diego, CA (United States), 18-22 May 1998

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  • Other: DE98058595
  • Report No.: UCRL-JC--130766
  • Report No.: CONF-980560--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 303887
  • Archival Resource Key: ark:/67531/metadc678528

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  • May 1, 1998

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  • July 25, 2015, 2:20 a.m.

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  • April 10, 2017, 2:04 p.m.

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Hill, D. N., LLNL. Detached divertor operation in DIII-D helium plasmas, article, May 1, 1998; California. (digital.library.unt.edu/ark:/67531/metadc678528/: accessed November 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.