A formula for efficiency of fast wave current drive in fusion devices [electronic resource].
- Published:
- Washington, D.C. : United States. Dept. of Energy, 1992.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description:
- Pages: (4 pages) : digital, PDF file
- Additional Creators:
- General Atomic Company
United States. Department of Energy
United States. Department of Energy. Office of Scientific and Technical Information - Access Online:
- www.osti.gov
- Summary:
- Fast wave current drive (FWCD) is a principal candidate for non- inductive current drive schemes in reactors. Major experiments are in progress or planned on DIII-D, JET, and Tore-Supra. A theory for FWCD was presented by two of the authors and collaborators. To minimize computations required in transport simulations, and for analytical understanding, it is very useful to have a concise analytical efficiency formula. Fisch and Karney, and Ehst and Karney have obtained empirical formulae that fits numerical results for the Landau limit and Alfven limit; the latter fits results at 1 < Z{sub i} ≤ 2. This paper extends a previous numerical study on FWCD at arbitrary frequencies and Z{sub i}. Analytical formulae for FWCD efficiency, valid for all frequencies and Z{sub i}, are derived using the adjoint technique in high and low phase velocity regions. A smooth patching between the two regions produces an analytical formula which is accurate for all frequencies, Z{sub i}, and phase velocities. Comparison with existing results will be discussed. A corollary of the present calculation is that a low phase velocities and in the Landau limit, the efficiency is the same as that calculated from the Lorentz model collision operator.
- Subject(s):
- Note:
- Published through SciTech Connect.
06/01/1992.
"ga-a-20873"
" conf-920717--1"
"DE92016152"
Topical conference meeting on radio frequency heating and current drive of fusion devices, Brussels (Belgium), 7-10 Jul 1992.
Harvey, R.W.; Karney, C.F.F. . Plasma Physics Lab.; Chiu, S.C.; Mau, T.K. . School of Engineering and Ap. - Funding Information:
- AC03-89ER53277
AC02-76CH03073
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