Simulation of experimentally achieved detached plasmas using the UEDGE code

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The introduction of a divertor Thomson scattering system in DIII-D has enabled accurate determination of the plasma properties in the divertor region. We identify two plasma regimes; detached and attached. The electron temperature in the detached regime is about 2 eV, much lower than 5 to 10 eV determined earlier. We show that fluid models of the DIII-D scrape-off layer plasma are able to reproduce many of the features of these two plasma regimes, including the boundaries for transition between them. Detailed comparison between the results obtained from the fluid models and experiment suggest the models underestimate the spatial extent ... continued below

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29 p.

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Porter, G.D.; Allen, S. & Fenstermacher, M. October 30, 1995.

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The introduction of a divertor Thomson scattering system in DIII-D has enabled accurate determination of the plasma properties in the divertor region. We identify two plasma regimes; detached and attached. The electron temperature in the detached regime is about 2 eV, much lower than 5 to 10 eV determined earlier. We show that fluid models of the DIII-D scrape-off layer plasma are able to reproduce many of the features of these two plasma regimes, including the boundaries for transition between them. Detailed comparison between the results obtained from the fluid models and experiment suggest the models underestimate the spatial extent of the low temperature region associated the detached plasma mode. We suggest that atomic physics processes at the low electron temperatures reported here may account for this discrepancy.

Physical Description

29 p.

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INIS; OSTI as DE96005385

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  • 37. annual meeting of the American Physical Society Division of Plasma Physics, Louisville, KY (United States), 6-10 Nov 1995

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  • Other: DE96005385
  • Report No.: UCRL-JC--122501
  • Report No.: CONF-951182--6
  • Grant Number: AC03-89ER51114;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 192514
  • Archival Resource Key: ark:/67531/metadc667586

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  • October 30, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Aug. 1, 2016, 6:53 p.m.

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Porter, G.D.; Allen, S. & Fenstermacher, M. Simulation of experimentally achieved detached plasmas using the UEDGE code, article, October 30, 1995; California. (digital.library.unt.edu/ark:/67531/metadc667586/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.