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Title: Excitation of a global plasma mode by an intense electron beam in a dc discharge

Abstract

The interaction of an intense electron beam with a finite-length, inhomogeneous plasma is investigated numerically. The plasma density profile is maximal in the middle and decays towards the plasma edges. Two regimes of the two-stream instability are observed. In one regime, the frequency of the instability is the plasma frequency at the density maximum and plasma waves are excited in the middle of the plasma. In the other regime, the frequency of the instability matches the local plasma frequency near the edges of the plasma and the intense plasma oscillations occur near plasma boundaries. The latter regime appears sporadically and only for strong electron beam currents. This instability generates a copious amount of suprathermal electrons. Finally, the energy transfer to suprathermal electrons is the saturation mechanism of the instability.

Authors:
 [1];  [2];  [3];  [3]
  1. Univ. of Alberta, Edmonton, AB (Canada). Dept. of Physics
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Tokyo Electron America, Inc., Austin, TX (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1433301
Alternate Identifier(s):
OSTI ID: 1414608
Grant/Contract Number:  
AC02-76CH03073
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 1; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Sydorenko, D., Kaganovich, I. D., Ventzek, P. L. G., and Chen, L. Excitation of a global plasma mode by an intense electron beam in a dc discharge. United States: N. p., 2018. Web. doi:10.1063/1.5018427.
Sydorenko, D., Kaganovich, I. D., Ventzek, P. L. G., & Chen, L. Excitation of a global plasma mode by an intense electron beam in a dc discharge. United States. doi:10.1063/1.5018427.
Sydorenko, D., Kaganovich, I. D., Ventzek, P. L. G., and Chen, L. Mon . "Excitation of a global plasma mode by an intense electron beam in a dc discharge". United States. doi:10.1063/1.5018427. https://www.osti.gov/servlets/purl/1433301.
@article{osti_1433301,
title = {Excitation of a global plasma mode by an intense electron beam in a dc discharge},
author = {Sydorenko, D. and Kaganovich, I. D. and Ventzek, P. L. G. and Chen, L.},
abstractNote = {The interaction of an intense electron beam with a finite-length, inhomogeneous plasma is investigated numerically. The plasma density profile is maximal in the middle and decays towards the plasma edges. Two regimes of the two-stream instability are observed. In one regime, the frequency of the instability is the plasma frequency at the density maximum and plasma waves are excited in the middle of the plasma. In the other regime, the frequency of the instability matches the local plasma frequency near the edges of the plasma and the intense plasma oscillations occur near plasma boundaries. The latter regime appears sporadically and only for strong electron beam currents. This instability generates a copious amount of suprathermal electrons. Finally, the energy transfer to suprathermal electrons is the saturation mechanism of the instability.},
doi = {10.1063/1.5018427},
journal = {Physics of Plasmas},
number = 1,
volume = 25,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

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Cited by: 1 work
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Figures / Tables:

FIG. 1: FIG. 1:: (a) Profiles of ion density at t = 49 ns (red) and t = 499 ns (blue). (b) Profile of the electrostatic potential at t = 49 ns. Note that t = 49 ns is 1 ns before the emission from the cathode begins.

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.