UEDGE simulation of detached divertor operation in DIII-D with a chemically sputtered carbon source

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We describe the response of the scrape-off layer (SOL) plasma to variations in the intensity, and geometry of an intrinsic carbon source in DIII-D. Using the multi species 2-D fluid plasma code UEDGE we find plasma modes which are similar to those seen experimentally. At high sputtering coefficient the plasma discontinuously transitions to a state in which the radiation power exceeds the input power and no steady state solution is obtained. We believe this corresponds to the MARFE (Multifaceted Asymmetric Radiation from Edge) state seen experimentally, in which the core confinement is reduced.

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7 p.

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Porter, G.D.; Rognlien, T.D.; Fenstermacher, M.E.; Hill, D.N.; Lasnier, C.J.; Isler, R.C. et al. May 21, 1997.

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Description

We describe the response of the scrape-off layer (SOL) plasma to variations in the intensity, and geometry of an intrinsic carbon source in DIII-D. Using the multi species 2-D fluid plasma code UEDGE we find plasma modes which are similar to those seen experimentally. At high sputtering coefficient the plasma discontinuously transitions to a state in which the radiation power exceeds the input power and no steady state solution is obtained. We believe this corresponds to the MARFE (Multifaceted Asymmetric Radiation from Edge) state seen experimentally, in which the core confinement is reduced.

Physical Description

7 p.

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INIS; OSTI as DE98051336

Other: FDE: PDF; PL:

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

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  • Other: DE98051336
  • Report No.: UCRL-JC--127389
  • Report No.: CONF-9706131--
  • Grant Number: W-7405-ENG-48;AC03-89ER51114
  • Office of Scientific & Technical Information Report Number: 645331
  • Archival Resource Key: ark:/67531/metadc697413

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  • May 21, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 6, 2017, 6:04 p.m.

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Porter, G.D.; Rognlien, T.D.; Fenstermacher, M.E.; Hill, D.N.; Lasnier, C.J.; Isler, R.C. et al. UEDGE simulation of detached divertor operation in DIII-D with a chemically sputtered carbon source, article, May 21, 1997; California. (digital.library.unt.edu/ark:/67531/metadc697413/: accessed December 12, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.