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Title: Radiation temperature of non-equilibrium plasmas

Abstract

In fusion devices measurements of the radiation temperature T{sub r} ({omega}, k) near the electron cyclotron frequency {omega}{sub C} and the second harmonic 2{omega}{sub C} in directions nearly perpendicular to the confining magnetic field B (i.e., k {approx} k {perpendicular}) serve to map out the electron temperature profiles T{sub e}(r,t). For optically thick plasma at thermodynamic equilibrium T{sub r} = T{sub e}. However, there is increasing experimental evidence for the presence of non-equilibrium electron distributions (such as a drifting Maxwellian with appreciable values of the streaming parameter {omicron} = v{sub d}/v{sub t}, a bi- Maxwellian, and anisotropic Maxwellian with T {perpendicular} {ne} T {parallel}, etc.,) in tokamak plasmas, especially in the presence of radio-frequency heating. Here, we examine (both non-relativistically and relativistically) the dependence of T{sub r} on {omicron}, T{perpendicular}/T{parallel}, T{sub h}/T{sub b}, n{sub h}/n{sub b}etc., where n{sub b}, n{sub h}, T{sub b}, T{sub h} are the densities and temperatures, respectively, of the bulk and the hot components of the bi-Maxwellian plasma. Our bi-Maxwellian results predict that the ratio T{sub r}/T{sub e} is a very sensitive function of the ratios n{sub h}/n{sub b} and T{sub h}/T{sub b}. Further, these relativistic and non-relativistic results satisfy the well-known limit c {yields} {infinity}more » correspondence principle'', showing that the intensity of the emission and absorption line is independent of the line broadening mechanism. 44 refs., 2 figs.« less

Authors:
Publication Date:
Research Org.:
Princeton Univ., NJ (United States). Plasma Physics Lab.
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
5457072
Report Number(s):
PPPL-2782
ON: DE91016217; TRN: 91-022198
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELECTROMAGNETIC RADIATION; TEMPERATURE DISTRIBUTION; NON-EQUILIBRIUM PLASMA; BOLTZMANN EQUATION; DISTRIBUTION FUNCTIONS; ECR HEATING; ELECTRON TEMPERATURE; MAGNETIC FIELDS; TEMPERATURE MEASUREMENT; DIFFERENTIAL EQUATIONS; EQUATIONS; FUNCTIONS; HEATING; HIGH-FREQUENCY HEATING; PARTIAL DIFFERENTIAL EQUATIONS; PLASMA; PLASMA HEATING; RADIATIONS; 700103* - Fusion Energy- Plasma Research- Kinetics

Citation Formats

Arunasalam, V. Radiation temperature of non-equilibrium plasmas. United States: N. p., 1991. Web. doi:10.2172/5457072.
Arunasalam, V. Radiation temperature of non-equilibrium plasmas. United States. doi:10.2172/5457072.
Arunasalam, V. Mon . "Radiation temperature of non-equilibrium plasmas". United States. doi:10.2172/5457072. https://www.osti.gov/servlets/purl/5457072.
@article{osti_5457072,
title = {Radiation temperature of non-equilibrium plasmas},
author = {Arunasalam, V},
abstractNote = {In fusion devices measurements of the radiation temperature T{sub r} ({omega}, k) near the electron cyclotron frequency {omega}{sub C} and the second harmonic 2{omega}{sub C} in directions nearly perpendicular to the confining magnetic field B (i.e., k {approx} k {perpendicular}) serve to map out the electron temperature profiles T{sub e}(r,t). For optically thick plasma at thermodynamic equilibrium T{sub r} = T{sub e}. However, there is increasing experimental evidence for the presence of non-equilibrium electron distributions (such as a drifting Maxwellian with appreciable values of the streaming parameter {omicron} = v{sub d}/v{sub t}, a bi- Maxwellian, and anisotropic Maxwellian with T {perpendicular} {ne} T {parallel}, etc.,) in tokamak plasmas, especially in the presence of radio-frequency heating. Here, we examine (both non-relativistically and relativistically) the dependence of T{sub r} on {omicron}, T{perpendicular}/T{parallel}, T{sub h}/T{sub b}, n{sub h}/n{sub b}etc., where n{sub b}, n{sub h}, T{sub b}, T{sub h} are the densities and temperatures, respectively, of the bulk and the hot components of the bi-Maxwellian plasma. Our bi-Maxwellian results predict that the ratio T{sub r}/T{sub e} is a very sensitive function of the ratios n{sub h}/n{sub b} and T{sub h}/T{sub b}. Further, these relativistic and non-relativistic results satisfy the well-known limit c {yields} {infinity} correspondence principle'', showing that the intensity of the emission and absorption line is independent of the line broadening mechanism. 44 refs., 2 figs.},
doi = {10.2172/5457072},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1991},
month = {7}
}