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Author Cooper, W. A. ♦ Singleton, D. B. ♦ Dewar, R. L.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION ♦ STELLARATORS ♦ BALLOONING INSTABILITY ♦ COMPUTER CODES ♦ DISPERSION RELATIONS ♦ NUMERICAL SOLUTION ♦ PLASMA SIMULATION ♦ SEMICLASSICAL APPROXIMATION ♦ TOKAMAK DEVICES ♦ WKB APPROXIMATION
Abstract The recent revival of interest in the application of the {open_quote}{open_quote}ballooning formalism{close_quote}{close_quote} to low-frequency plasma instabilities has prompted a comparison of the Wentzel{endash}Kramers{endash}Brillouin (WKB) ballooning approximation with an (in principle) exact normal mode calculation for a three-dimensional plasma equilibrium. Semiclassical quantization, using the ideal magnetohydrodynamic (MHD) ballooning eigenvalue to provide a local dispersion relation, is applied to a ten-field period stellarator test case. Excellent qualitative agreement, and good quantitative agreement is found with predictions from the TERPSICHORE code [D. V. Anderson {ital et} {ital al}., Int. J. Supercomput. Appl. {bold 4}, 34 (1990)] for toroidal mode numbers from 1 to 14 and radial mode numbers from 0 to 2. The continuum bands predicted from three-dimensional WKB theory are too narrow to resolve. {copyright} {ital 1996 American Institute of Physics.}
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-01-01
Publisher Place United States
Journal Physics of Plasmas
Volume Number 3
Issue Number 1


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