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Radio frequency current drive for small aspect ratio tori [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy. Office of Energy Research, 1994.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
6 pages : digital, PDF file
Additional Creators
United States. Department of Energy. Office of Energy Research and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
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.
Report Numbers
E 1.99:conf-9704102--4
conf-9704102--4
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
12/31/1994.
"conf-9704102--4"
"DE97005118"
12. topical conference on radio frequency power in plasmas, Savannah, GA (United States), 1-3 Apr 1997.
Batchelor, D.B.; Majeski, R.; Carter, M.D.; Jaeger, E.F.; Strickler, D.J.
Lockheed Martin Energy Research, Inc., Oak Ridge, TN (United States)
Funding Information
AC05-96OR22464
View MARC record | catkey: 14743134