Abstract
A theoretical model of Thomson scattering in a magnetized plasma, taking spatial dispersion into account, is developed ab initio. The resulting expressions allow thermal motion to be included in the description of the plasma and remain valid for frequencies of the probing radiation in the region of {omega}{sub pe} and {omega}{sub ce}, provided the absorption is small. With these expressions the effects of the dielectric properties of magnetized plasmas on the scattering of electromagnetic radiation by density fluctuations are investigated. Significant relativistic effects, of practical importance for millimeter wave scattering in large Tokamaks, are predicted. The complete expression for the source current of the scattered field is derived in the cold plasma limit by a kinetic approach. It is found that a number of mistakes were made in the tratitional fluid derivation, which explains the differences between earlier results and our results in this limit. Significant relativistic modifications of refractive indices and locations of cutoffs are found for frequencies in the range of {omega}{sub pe} and {omega}{sub ce}. Fully relativistic expressions for locations of the X-mode cutoffs are derived and new algorithms are given which extend the regime in which the weakly relativistic dielectri tensor can be computed. For X-mode
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Citation Formats
Bindslev, H.
On the theory of Thomson scattering and reflectometry in a relativistic magnetized plasma.
Denmark: N. p.,
1992.
Web.
Bindslev, H.
On the theory of Thomson scattering and reflectometry in a relativistic magnetized plasma.
Denmark.
Bindslev, H.
1992.
"On the theory of Thomson scattering and reflectometry in a relativistic magnetized plasma."
Denmark.
@misc{etde_10144874,
title = {On the theory of Thomson scattering and reflectometry in a relativistic magnetized plasma}
author = {Bindslev, H}
abstractNote = {A theoretical model of Thomson scattering in a magnetized plasma, taking spatial dispersion into account, is developed ab initio. The resulting expressions allow thermal motion to be included in the description of the plasma and remain valid for frequencies of the probing radiation in the region of {omega}{sub pe} and {omega}{sub ce}, provided the absorption is small. With these expressions the effects of the dielectric properties of magnetized plasmas on the scattering of electromagnetic radiation by density fluctuations are investigated. Significant relativistic effects, of practical importance for millimeter wave scattering in large Tokamaks, are predicted. The complete expression for the source current of the scattered field is derived in the cold plasma limit by a kinetic approach. It is found that a number of mistakes were made in the tratitional fluid derivation, which explains the differences between earlier results and our results in this limit. Significant relativistic modifications of refractive indices and locations of cutoffs are found for frequencies in the range of {omega}{sub pe} and {omega}{sub ce}. Fully relativistic expressions for locations of the X-mode cutoffs are derived and new algorithms are given which extend the regime in which the weakly relativistic dielectri tensor can be computed. For X-mode plasma reflectometry it is demonstrated that these effects may shift the location of the reflecting layer by a significant fraction of the minor radius and that the cold model may lead to considerable underestimations of the density profile. (au) (30 ills., 186 refs.).}
place = {Denmark}
year = {1992}
month = {Dec}
}
title = {On the theory of Thomson scattering and reflectometry in a relativistic magnetized plasma}
author = {Bindslev, H}
abstractNote = {A theoretical model of Thomson scattering in a magnetized plasma, taking spatial dispersion into account, is developed ab initio. The resulting expressions allow thermal motion to be included in the description of the plasma and remain valid for frequencies of the probing radiation in the region of {omega}{sub pe} and {omega}{sub ce}, provided the absorption is small. With these expressions the effects of the dielectric properties of magnetized plasmas on the scattering of electromagnetic radiation by density fluctuations are investigated. Significant relativistic effects, of practical importance for millimeter wave scattering in large Tokamaks, are predicted. The complete expression for the source current of the scattered field is derived in the cold plasma limit by a kinetic approach. It is found that a number of mistakes were made in the tratitional fluid derivation, which explains the differences between earlier results and our results in this limit. Significant relativistic modifications of refractive indices and locations of cutoffs are found for frequencies in the range of {omega}{sub pe} and {omega}{sub ce}. Fully relativistic expressions for locations of the X-mode cutoffs are derived and new algorithms are given which extend the regime in which the weakly relativistic dielectri tensor can be computed. For X-mode plasma reflectometry it is demonstrated that these effects may shift the location of the reflecting layer by a significant fraction of the minor radius and that the cold model may lead to considerable underestimations of the density profile. (au) (30 ills., 186 refs.).}
place = {Denmark}
year = {1992}
month = {Dec}
}