Broadening of the scrape-off-layer by a plasma convection induced by toroidal asymmetries of the divertor plates and the gas-puff

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In the open field line region of the scrape-off layer (SOL), plasma potential is to a considerable degree determined by the boundary conditions on the divertor plates. By introducing toroidal asymmetries of the surface relief of the divertor plates or of their chemical composition, one can create toroidally asymmetric potential variations over the whole SOL and thereby induce convective plasma motion. This motion should lead to a broadening of the SOL and to reduction of beat load on the divertor plates. Convective motion can be induced also by a toroidally asymmetric gas-puff. In the present paper the authors consider all ... continued below

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6 p.

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Cohen, R.H. & Ryutov, D.D. September 25, 1995.

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In the open field line region of the scrape-off layer (SOL), plasma potential is to a considerable degree determined by the boundary conditions on the divertor plates. By introducing toroidal asymmetries of the surface relief of the divertor plates or of their chemical composition, one can create toroidally asymmetric potential variations over the whole SOL and thereby induce convective plasma motion. This motion should lead to a broadening of the SOL and to reduction of beat load on the divertor plates. Convective motion can be induced also by a toroidally asymmetric gas-puff. In the present paper the authors consider all these techniques and evaluate the possible increase in the cross-field transport.

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6 p.

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INIS; OSTI as DE96003164

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  • 16. IEEE/NPSS symposium on fusion engineering, Champaign, IL (United States), 1-5 Oct 1995

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  • Other: DE96003164
  • Report No.: UCRL-JC--121057
  • Report No.: CONF-950905--14
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 161552
  • Archival Resource Key: ark:/67531/metadc628485

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  • September 25, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 23, 2016, 1:09 p.m.

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Cohen, R.H. & Ryutov, D.D. Broadening of the scrape-off-layer by a plasma convection induced by toroidal asymmetries of the divertor plates and the gas-puff, article, September 25, 1995; California. (digital.library.unt.edu/ark:/67531/metadc628485/: accessed November 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.