Abstract
A solution is presented for electron plasma oscillation in a thermalized homogeneous plasma, at arbitrary ratios between the Debye length {lambda}{sub D} and the perturbation wave length {lambda}. The limit {lambda}{sub D} << {lambda} corresponds to conventional fluid-like theory of small particle excursions, whereas {lambda}{sub D} >> {lambda} corresponds to the free-streaming limit of strong kinetic phase-mixing due to large particle excursions. A strong large Debye distance (LDD) effect already appears when {lambda}{sub D} > approx {lambda}. The initial amplitude of the fluid-like contribution to the macroscopic density perturbation then becomes small as compared to the contribution from the free-streaming part. As a consequence, only a small fraction of the density perturbation remains after a limited number of kinetic damping times of the free-streaming part. The analysis further shows that a representation in terms of normal model of the form exp(-i{omega}t) leads to amplitude factors of these modes which are related to each other and which depend on the combined free-streaming and fluid behaviour of the plasma. Consequently, these modes are coupled and cannot be treated as being independent of each other. (au).
Citation Formats
Lehnert, B.
Electron plasma oscillations at arbitrary Debye lengths.
Sweden: N. p.,
1990.
Web.
Lehnert, B.
Electron plasma oscillations at arbitrary Debye lengths.
Sweden.
Lehnert, B.
1990.
"Electron plasma oscillations at arbitrary Debye lengths."
Sweden.
@misc{etde_10111741,
title = {Electron plasma oscillations at arbitrary Debye lengths}
author = {Lehnert, B}
abstractNote = {A solution is presented for electron plasma oscillation in a thermalized homogeneous plasma, at arbitrary ratios between the Debye length {lambda}{sub D} and the perturbation wave length {lambda}. The limit {lambda}{sub D} << {lambda} corresponds to conventional fluid-like theory of small particle excursions, whereas {lambda}{sub D} >> {lambda} corresponds to the free-streaming limit of strong kinetic phase-mixing due to large particle excursions. A strong large Debye distance (LDD) effect already appears when {lambda}{sub D} > approx {lambda}. The initial amplitude of the fluid-like contribution to the macroscopic density perturbation then becomes small as compared to the contribution from the free-streaming part. As a consequence, only a small fraction of the density perturbation remains after a limited number of kinetic damping times of the free-streaming part. The analysis further shows that a representation in terms of normal model of the form exp(-i{omega}t) leads to amplitude factors of these modes which are related to each other and which depend on the combined free-streaming and fluid behaviour of the plasma. Consequently, these modes are coupled and cannot be treated as being independent of each other. (au).}
place = {Sweden}
year = {1990}
month = {Dec}
}
title = {Electron plasma oscillations at arbitrary Debye lengths}
author = {Lehnert, B}
abstractNote = {A solution is presented for electron plasma oscillation in a thermalized homogeneous plasma, at arbitrary ratios between the Debye length {lambda}{sub D} and the perturbation wave length {lambda}. The limit {lambda}{sub D} << {lambda} corresponds to conventional fluid-like theory of small particle excursions, whereas {lambda}{sub D} >> {lambda} corresponds to the free-streaming limit of strong kinetic phase-mixing due to large particle excursions. A strong large Debye distance (LDD) effect already appears when {lambda}{sub D} > approx {lambda}. The initial amplitude of the fluid-like contribution to the macroscopic density perturbation then becomes small as compared to the contribution from the free-streaming part. As a consequence, only a small fraction of the density perturbation remains after a limited number of kinetic damping times of the free-streaming part. The analysis further shows that a representation in terms of normal model of the form exp(-i{omega}t) leads to amplitude factors of these modes which are related to each other and which depend on the combined free-streaming and fluid behaviour of the plasma. Consequently, these modes are coupled and cannot be treated as being independent of each other. (au).}
place = {Sweden}
year = {1990}
month = {Dec}
}