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Title: Electron cyclotron emission from nonthermal tokamak plasmas

Abstract

Electron cyclotron emission can be a sensitive indicator of nonthermal electron distributions. A new, comprehensive ray-tracing and cyclotron emission code that is aimed at predicting and interpreting the cyclotron emission from tokamak plasmas is described. The radiation transfer equation is solved along Wentzel--Kramers--Brillouin (WKB) rays using a fully relativistic calculation of the emission and absorption from electron distributions that are gyrotropic and toroidally symmetric, but may be otherwise arbitrary functions of the constants of motion. Using a radial array of electron distributions obtained from a bounce-averaged Fokker--Planck code modeling dc electron field and electron cyclotron heating effects, the cyclotron emission spectra are obtained. A pronounced strong nonthermal cyclotron emission feature that occurs at frequencies relativistically downshifted to second harmonic cyclotron frequencies outside the tokamak is calculated, in agreement with experimental results from the DIII-D [J. L. Luxon and L. G. Davies, Fusion Technol. [bold 8], 441 (1985)] and FT-1 [D. G. Bulyginsky [ital et] [ital al]., in [ital Proceedings] [ital of] [ital the] 15[ital th] [ital European] [ital Conference] [ital on] [ital Controlled] [ital Fusion] [ital and] [ital Plasma] [ital Heating], Dubrovnik, 1988 (European Physical Society, Petit-Lancy, 1988), Vol. 12B, Part II, p. 823] tokamaks. The calculations indicate the presencemore » of a strong loss mechanism that operates on electrons in the 100--150 keV energy range.« less

Authors:
; ; ; ; ;  [1]
  1. (General Atomics, San Diego, California 92186-9784 (United States))
Publication Date:
OSTI Identifier:
6941115
DOE Contract Number:  
AC03-89ER53277
Resource Type:
Journal Article
Journal Name:
Physics of Fluids B; (United States)
Additional Journal Information:
Journal Volume: 5:2; Journal ID: ISSN 0899-8221
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TOKAMAK DEVICES; ELECTRON CYCLOTRON-RESONANCE; COMPUTER CODES; CURRENT-DRIVE HEATING; DISTRIBUTION FUNCTIONS; EMISSION SPECTRA; FOKKER-PLANCK EQUATION; PLASMA HEATING; WKB APPROXIMATION; CLOSED PLASMA DEVICES; CYCLOTRON RESONANCE; DIFFERENTIAL EQUATIONS; ELECTRIC HEATING; EQUATIONS; FUNCTIONS; HEATING; JOULE HEATING; PARTIAL DIFFERENTIAL EQUATIONS; RESISTANCE HEATING; RESONANCE; SPECTRA; THERMONUCLEAR DEVICES; 700350* - Plasma Production, Heating, Current Drive, & Interactions- (1992-)

Citation Formats

Harvey, R.W., O'Brien, M.R., Rozhdestvensky, V.V., Luce, T.C., McCoy, M.G., and Kerbel, G.D. Electron cyclotron emission from nonthermal tokamak plasmas. United States: N. p., 1993. Web. doi:10.1063/1.860530.
Harvey, R.W., O'Brien, M.R., Rozhdestvensky, V.V., Luce, T.C., McCoy, M.G., & Kerbel, G.D. Electron cyclotron emission from nonthermal tokamak plasmas. United States. doi:10.1063/1.860530.
Harvey, R.W., O'Brien, M.R., Rozhdestvensky, V.V., Luce, T.C., McCoy, M.G., and Kerbel, G.D. Mon . "Electron cyclotron emission from nonthermal tokamak plasmas". United States. doi:10.1063/1.860530.
@article{osti_6941115,
title = {Electron cyclotron emission from nonthermal tokamak plasmas},
author = {Harvey, R.W. and O'Brien, M.R. and Rozhdestvensky, V.V. and Luce, T.C. and McCoy, M.G. and Kerbel, G.D.},
abstractNote = {Electron cyclotron emission can be a sensitive indicator of nonthermal electron distributions. A new, comprehensive ray-tracing and cyclotron emission code that is aimed at predicting and interpreting the cyclotron emission from tokamak plasmas is described. The radiation transfer equation is solved along Wentzel--Kramers--Brillouin (WKB) rays using a fully relativistic calculation of the emission and absorption from electron distributions that are gyrotropic and toroidally symmetric, but may be otherwise arbitrary functions of the constants of motion. Using a radial array of electron distributions obtained from a bounce-averaged Fokker--Planck code modeling dc electron field and electron cyclotron heating effects, the cyclotron emission spectra are obtained. A pronounced strong nonthermal cyclotron emission feature that occurs at frequencies relativistically downshifted to second harmonic cyclotron frequencies outside the tokamak is calculated, in agreement with experimental results from the DIII-D [J. L. Luxon and L. G. Davies, Fusion Technol. [bold 8], 441 (1985)] and FT-1 [D. G. Bulyginsky [ital et] [ital al]., in [ital Proceedings] [ital of] [ital the] 15[ital th] [ital European] [ital Conference] [ital on] [ital Controlled] [ital Fusion] [ital and] [ital Plasma] [ital Heating], Dubrovnik, 1988 (European Physical Society, Petit-Lancy, 1988), Vol. 12B, Part II, p. 823] tokamaks. The calculations indicate the presence of a strong loss mechanism that operates on electrons in the 100--150 keV energy range.},
doi = {10.1063/1.860530},
journal = {Physics of Fluids B; (United States)},
issn = {0899-8221},
number = ,
volume = 5:2,
place = {United States},
year = {1993},
month = {2}
}