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Modeling Results for Proposed NSTX 28 GHz and EBWH System [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy. Office of Science, 2008.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators:
Princeton University. Plasma Physics Laboratory, United States. Department of Energy. Office of Science, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
A 28 GHz electron cyclotron heating (ECH) and electron Bernstein wave heating (EBWH) system has been proposed for installation on the National Spherical Torus Experiment (NSTX). A 350 kW gyrotron connected to a fixed horn antenna is proposed for ECH-assisted solenoid-free plasma startup. Modeling predicts strong first pass on-axis EC absorption, even for low electron temperature, Te ~ 20 eV, Coaxial Helicity Injection (CHI) startup plasmas. ECH will heat the CHI plasma to Te ~ 300 eV, providing a suitable target plasma for 30 MHz high-harmonic fast wave heating. A second gyrotron and steered O-X-B mirror launcher is proposed for EBWH experiments. Radiometric measurements of thermal EBW emission detected via B-X-O coupling on NSTX support implementation of the proposed system. 80% B-X-O coupling efficiency was measured in L-mode plasmas and 60% B-X-O coupling efficiency was recently measured in H-mode plasmas conditioned with evaporated lithium. Modeling predicts local on-axis EBW heating and current drive using 28 GHz power in β ~ 20% NSTX plasmas should be possible, with current drive efficiencies ~ 40 kA/MW.
Report Numbers:
E 1.99:pppl-4306
pppl-4306
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Note:
Published through SciTech Connect.
03/20/2008.
"pppl-4306"
15th Joint Workshop on Electgron Cyclotron Emission and Electron Cyclotron Resonance Heating, Yosemite, CA (March 10-13-08).
Taylor, G; Greenough, N; Fredd, E; Urban, J; Preinhaelter, J; Wilgen, J B; Harvey, R W; Hosea, J C; Smirnov, A P; Ellis, R A.
Funding Information:
DE-ACO2-76CHO3073
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