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Fast-wave heating of a reactor plasma [electronic resource] : consideration of two frequency regimes

Published:
Princeton, N.J. : Princeton University, 1976.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
Pages: 11 : digital, PDF file
Additional Creators:
Princeton University and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
Fast-wave heating at omega = n omega/sub ci/, n = 1 or 2, is well suited to heating intermediate-size tokamaks such as ATC and PLT, but for significantly larger machines, the frequency spectrum becomes thickly packed with these modes. Adequate mode selection could require elaborate antennas; otherwise, mode overlap may produce surface heating of the plasma due to strong near fields at the antennas. On the other hand, the large minor radius and high plasma density in next-generation tokamaks will accommodate fast-wave toroidal eigenmodes at much longer wavelengths and at frequencies which are well below all the cyclotron frequencies of ions of the fuel gas and of most impurities (carbon, oxygen, iron). Electron transit-time and Landau damping provide adequate absorption mechanisms, while the high intrinsic Q of the fast-wave modes will allow strong coupling to the plasma with minimal antenna structures. The low frequency range (1-2 MHz) is also advantageous for coupling together electronic modules to provide several hundred megawatts rf heating power. Also interesting to consider is excitation such that the Alfven resonance layer is halfway inside the plasma, weakly coupled to a m = 0 fast-wave propagating in the plasma core region.
Report Numbers:
E 1.99:pppl-1298
E 1.99: conf-760958-4
conf-760958-4
pppl-1298
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Note:
Published through SciTech Connect.
10/01/1976.
"pppl-1298"
" conf-760958-4"
3. international symposium of plasma physics on heating in torodial devices, Varenna, Italy, 6 Sep 1976.
Stix, T.H.
Funding Information:
E(11-1)-3073
View MARC record | catkey: 14752844