Electron beam relaxation in inhomogeneous plasmas
In this work, we studied the effects of background plasma density fluctuations on the relaxation of electron beams. For the study, we assumed that the level of fluctuations was so high that the majority of Langmuir waves generated as a result of beam-plasma instability were trapped inside densit...
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Copernicus Publications
2013-08-01
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Series: | Annales Geophysicae |
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doaj-e81d434e515f4cf2b4b6a38f6b7eb68d2020-11-24T22:27:40ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762013-08-01311379138510.5194/angeo-31-1379-2013Electron beam relaxation in inhomogeneous plasmasA. Voshchepynets0V. Krasnoselskikh1LPCE/CNRS UMR7328, Orleans, FranceLPCE/CNRS UMR7328, Orleans, FranceIn this work, we studied the effects of background plasma density fluctuations on the relaxation of electron beams. For the study, we assumed that the level of fluctuations was so high that the majority of Langmuir waves generated as a result of beam-plasma instability were trapped inside density depletions. The system can be considered as a good model for describing beam-plasma interactions in the solar wind. Here we show that due to the effect of wave trapping, beam relaxation slows significantly. As a result, the length of relaxation for the electron beam in such an inhomogeneous plasma is much longer than in a homogeneous plasma. Additionally, for sufficiently narrow beams, the process of relaxation is accompanied by transformation of significant part of the beam kinetic energy to energy of accelerated particles. They form the tail of the distribution and can carry up to 50% of the initial beam energy flux.https://www.ann-geophys.net/31/1379/2013/angeo-31-1379-2013.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
A. Voshchepynets V. Krasnoselskikh |
spellingShingle |
A. Voshchepynets V. Krasnoselskikh Electron beam relaxation in inhomogeneous plasmas Annales Geophysicae |
author_facet |
A. Voshchepynets V. Krasnoselskikh |
author_sort |
A. Voshchepynets |
title |
Electron beam relaxation in inhomogeneous plasmas |
title_short |
Electron beam relaxation in inhomogeneous plasmas |
title_full |
Electron beam relaxation in inhomogeneous plasmas |
title_fullStr |
Electron beam relaxation in inhomogeneous plasmas |
title_full_unstemmed |
Electron beam relaxation in inhomogeneous plasmas |
title_sort |
electron beam relaxation in inhomogeneous plasmas |
publisher |
Copernicus Publications |
series |
Annales Geophysicae |
issn |
0992-7689 1432-0576 |
publishDate |
2013-08-01 |
description |
In this work, we studied the effects of background plasma
density fluctuations on the relaxation of electron beams. For the
study, we assumed that the level of fluctuations was so high that
the majority of Langmuir waves generated as a result of beam-plasma
instability were trapped inside density depletions. The system can
be considered as a good model for describing beam-plasma
interactions in the solar wind. Here we show that due to the
effect of wave trapping, beam relaxation slows significantly. As a
result, the length of relaxation for the electron beam in such an
inhomogeneous plasma is much longer than in a homogeneous plasma.
Additionally, for sufficiently narrow beams, the process of
relaxation is accompanied by transformation of significant part of
the beam kinetic energy to energy of accelerated particles. They
form the tail of the distribution and can carry up to 50% of the
initial beam energy flux. |
url |
https://www.ann-geophys.net/31/1379/2013/angeo-31-1379-2013.pdf |
work_keys_str_mv |
AT avoshchepynets electronbeamrelaxationininhomogeneousplasmas AT vkrasnoselskikh electronbeamrelaxationininhomogeneousplasmas |
_version_ |
1725748988654649344 |