PHYSICS OF OFF-AXIS ELECTRON CYCLOTRON CURRENT DRIVE

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Electron cyclotron current drive is a key option for driving current off-axis in a tokamak, as needed for example for current profile control or for suppression of neoclassical tearing modes. Experiments in DIII-D at low beta have shown that the partial cancellation of the Fisch-Boozer co-current by the Ohkawa counter-current can cause strong deterioration of the current drive efficiency at larger minor radius. However, more recent experiments at higher power have shown that the loss in efficiency can be mostly recovered if the target plasma has higher electron beta, {beta}{sub e}. The improvement in efficiency with beta can be understood ... continued below

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PRATER, R.; PETTY, C.C.; HARVEY, R.; LIN-LIU, Y.R.; LOHR, J.M. & LUCE, T.C. July 1, 2002.

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Electron cyclotron current drive is a key option for driving current off-axis in a tokamak, as needed for example for current profile control or for suppression of neoclassical tearing modes. Experiments in DIII-D at low beta have shown that the partial cancellation of the Fisch-Boozer co-current by the Ohkawa counter-current can cause strong deterioration of the current drive efficiency at larger minor radius. However, more recent experiments at higher power have shown that the loss in efficiency can be mostly recovered if the target plasma has higher electron beta, {beta}{sub e}. The improvement in efficiency with beta can be understood from a theoretical viewpoint by applying the Fokker-Planck code CQL3D, which shows excellent agreement with experiment over a wide range of parameters, thereby validating the code as an effective means of predicting the ECCD.

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Medium: X; Size: 7 pages

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Oakland Operations Office, Oakland, CA (US); INIS

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  • 29th European Physical Society Conference on Plasma Physics and Controlled Fusion, Montreux (CH), 06/17/2002--06/21/2002; Other Information: THIS IS A PREPRINT OF A PAPER PRESENTED AT THE 29TH EUROPEAN PHYSICAL SOCIETY CONFERENCE ON PLASMA PHYSICS AND CONTROLLED FUSION, JUNE 17-21,2002, IN MONTREUX, SWITZERLAND, AND TO BE PUBLISHED IN THE ''PROCEEDINGS''

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  • Report No.: NONE
  • Grant Number: AC03-99ER54463
  • Office of Scientific & Technical Information Report Number: 804711
  • Archival Resource Key: ark:/67531/metadc739513

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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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  • July 1, 2002

Added to The UNT Digital Library

  • Oct. 18, 2015, 6:40 p.m.

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  • April 19, 2016, 12:49 p.m.

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PRATER, R.; PETTY, C.C.; HARVEY, R.; LIN-LIU, Y.R.; LOHR, J.M. & LUCE, T.C. PHYSICS OF OFF-AXIS ELECTRON CYCLOTRON CURRENT DRIVE, article, July 1, 2002; United States. (digital.library.unt.edu/ark:/67531/metadc739513/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.