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Electron plasma oscillations at arbitrary Debye lengths

Technical Report:

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).
Authors:
Publication Date:
Dec 01, 1990
Product Type:
Technical Report
Report Number:
TRITA-PFU-90-13
Reference Number:
SCA: 700340; PA: AIX-23:013664; SN: 92000639334
Resource Relation:
Other Information: PBD: Dec 1990
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELECTRON PLASMA WAVES; DEBYE LENGTH; LARMOR RADIUS; NORMAL-MODE ANALYSIS; PLASMA DENSITY; 700340; PLASMA WAVES, OSCILLATIONS, AND INSTABILITIES
OSTI ID:
10111741
Research Organizations:
Royal Inst. of Tech., Stockholm (Sweden). Dept. of Plasma Physics and Fusion Research
Country of Origin:
Sweden
Language:
English
Other Identifying Numbers:
Other: ON: DE92614472; TRN: SE9100266013664
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
SWDN
Size:
22 p.
Announcement Date:
Jun 30, 2005

Technical Report:

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}
}