Current driven due to localized electron power deposition in DIII-D

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Description

Due to spatial localization of electron cyclotron wave injection in DIII-D, electrons heated in an off-axis region must toroidally transit the tokamak 25--50 times before re-entering the heating region. This distance is of the order of the mean free path. The effect of such RF localization is simulated with a time-dependent Fokker-Planck code which is 2D-in-velocity, 1D-in-space-along-B, and periodic in space. An effective parallel electric field arises to maintain continuity of the driven current. Somewhat surprisingly, the localized current drive efficiency remains equal to that for a uniform medium.

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5 p.

Creation Information

Harvey, R.W.; Lin-Liu, Y.R.; Luce, T.C.; Prater, R.; Sauter, O. & Smirnov, A.P. May 1, 1999.

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  • General Atomic Company
    Publisher Info: General Atomics, San Diego, CA (United States)
    Place of Publication: San Diego, California

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Description

Due to spatial localization of electron cyclotron wave injection in DIII-D, electrons heated in an off-axis region must toroidally transit the tokamak 25--50 times before re-entering the heating region. This distance is of the order of the mean free path. The effect of such RF localization is simulated with a time-dependent Fokker-Planck code which is 2D-in-velocity, 1D-in-space-along-B, and periodic in space. An effective parallel electric field arises to maintain continuity of the driven current. Somewhat surprisingly, the localized current drive efficiency remains equal to that for a uniform medium.

Physical Description

5 p.

Notes

INIS; OSTI as DE99002582

Source

  • 13. topical conference on applications of radio frequency power to plasmas, Annapolis, MD (United States), 12-14 Apr 1999

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  • Other: DE99002582
  • Report No.: GA--A23137
  • Report No.: CONF-990411--
  • Grant Number: AC03-99ER54463
  • Office of Scientific & Technical Information Report Number: 353438
  • Archival Resource Key: ark:/67531/metadc681628

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • May 1, 1999

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Aug. 3, 2016, 8:57 p.m.

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Harvey, R.W.; Lin-Liu, Y.R.; Luce, T.C.; Prater, R.; Sauter, O. & Smirnov, A.P. Current driven due to localized electron power deposition in DIII-D, article, May 1, 1999; San Diego, California. (digital.library.unt.edu/ark:/67531/metadc681628/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.