An evaluation of kinetic effects in the DIII-D divertor

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Under certain conditions, high temperature electrons diffusing across the separatrix near the midplane can propagate to the divertor without collision and produce a high energy tail in the electron distribution function near the separatrix. The authors evaluate a kinetic criterion along the field using measurements from divertor Thomson scattering and compare temperature measurements from target plate Langmuir probes to estimate the magnitude of the high energy tail. A Fokker-Planck kinetic model, which includes electron-electron, electron-ion, electron-neutral, and charge exchange interactions is used to estimate the size of the high energy tail. For the cases considered, the authors found less than ... continued below

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20 p.

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Watkins, J.G.; Batishchev, O.; Boedo, J.A.; Lehmer, R.; Moyer, R.A.; Hill, D.N. et al. August 1, 1998.

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Under certain conditions, high temperature electrons diffusing across the separatrix near the midplane can propagate to the divertor without collision and produce a high energy tail in the electron distribution function near the separatrix. The authors evaluate a kinetic criterion along the field using measurements from divertor Thomson scattering and compare temperature measurements from target plate Langmuir probes to estimate the magnitude of the high energy tail. A Fokker-Planck kinetic model, which includes electron-electron, electron-ion, electron-neutral, and charge exchange interactions is used to estimate the size of the high energy tail. For the cases considered, the authors found less than 1% of non-thermal particles near the target plate at typical densities and power levels for the DIII-D scrape-off layer plasma. ELMs violate the kinetic criterion.

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20 p.

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INIS; OSTI as DE98006155

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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: DE98006155
  • Report No.: GA--A22879
  • Report No.: CONF-980560--
  • Grant Number: AC03-89ER51114;AC04-94AL85000;FG03-97ER54392;FG02-91ER54109;FG03-95ER54294;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 656760
  • Archival Resource Key: ark:/67531/metadc709525

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  • August 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Aug. 1, 2016, 6:45 p.m.

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Watkins, J.G.; Batishchev, O.; Boedo, J.A.; Lehmer, R.; Moyer, R.A.; Hill, D.N. et al. An evaluation of kinetic effects in the DIII-D divertor, article, August 1, 1998; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc709525/: accessed October 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.