Radio frequency current drive for small aspect ratio tori

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Non-inductive current drive (CD) is required during plasma initiation and for current sustainment in NSTX. The physics of high harmonic fast waves (HHFW) and the design of an antenna system for NSTX are studied. It is found that the theoretical current drive efficiency for HHFW can be high, and a general survey of parameters gives a good target for the antenna design. The primary issue for HHFW during plasma initiation is loading since the CD efficiency is very high for low density plasmas. For high beta operation at full current launching in the usual manner from the equatorial plane may ... continued below

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6 p.

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Carter, M.D.; Jaeger, E.F.; Batchelor, D.B.; Strickler, D.J. & Majeski, R. December 31, 1994.

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Description

Non-inductive current drive (CD) is required during plasma initiation and for current sustainment in NSTX. The physics of high harmonic fast waves (HHFW) and the design of an antenna system for NSTX are studied. It is found that the theoretical current drive efficiency for HHFW can be high, and a general survey of parameters gives a good target for the antenna design. The primary issue for HHFW during plasma initiation is loading since the CD efficiency is very high for low density plasmas. For high beta operation at full current launching in the usual manner from the equatorial plane may lead to marginal CD performance. However, advanced antenna designs exploiting the theoretical results show some promise for high beta operation. Two methods to optimize the CD efficiency have been explored. The first non-zero poloidal mode excitation, provides enhanced efficiency because of improved penetration and a reduction of detrimental trapped particle effects. A second, placement of the antenna away from the equatorial plane, can also be used to reduce trapped particle effects. These methods can be used separately or together, yielding potential improvements of more than a factor of 2 in CD efficiency for NSTX.

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6 p.

Notes

INIS; OSTI as DE97005118

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  • 12. topical conference on radio frequency power in plasmas, Savannah, GA (United States), 1-3 Apr 1997

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  • Other: DE97005118
  • Report No.: CONF-9704102--4
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 468500
  • Archival Resource Key: ark:/67531/metadc675554

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  • December 31, 1994

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • Nov. 6, 2015, 1:19 p.m.

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Carter, M.D.; Jaeger, E.F.; Batchelor, D.B.; Strickler, D.J. & Majeski, R. Radio frequency current drive for small aspect ratio tori, article, December 31, 1994; United States. (digital.library.unt.edu/ark:/67531/metadc675554/: accessed August 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.