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Title: Generation of forerunner electron beam during interaction of ion beam pulse with plasma

Abstract

The long-time evolution of the two-stream instability of a cold tenuous ion beam pulse propagating through the background plasma with density much higher than the ion beam density is investigated using a large-scale one-dimensional electrostatic kinetic simulation. The three stages of the instability are investigated in detail. After the initial linear growth and saturation by the electron trapping, a portion of the initially trapped electrons becomes detrapped and moves ahead of the ion beam pulse forming a forerunner electron beam, which causes a secondary two-stream instability that preheats the upstream plasma electrons. Consequently, the self-consistent nonlinear-driven turbulent state is set up at the head of the ion beam pulse with the saturated plasma wave sustained by the influx of the cold electrons from upstream of the beam that lasts until the final stage when the beam ions become trapped by the plasma wave. Finally, the beam ion trapping leads to the nonlinear heating of the beam ions that eventually extinguishes the instability.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [2]
  1. Texas A & M Univ., College Station, TX (United States). Dept. of Aerospace Engineering; Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE; Japan Society for the Promotion of Science (JSPS)
OSTI Identifier:
1433304
Alternate Identifier(s):
OSTI ID: 1416462
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Journal Article: 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

Hara, Kentaro, Kaganovich, Igor D., and Startsev, Edward A. Generation of forerunner electron beam during interaction of ion beam pulse with plasma. United States: N. p., 2018. Web. doi:10.1063/1.5002688.
Hara, Kentaro, Kaganovich, Igor D., & Startsev, Edward A. Generation of forerunner electron beam during interaction of ion beam pulse with plasma. United States. doi:10.1063/1.5002688.
Hara, Kentaro, Kaganovich, Igor D., and Startsev, Edward A. Mon . "Generation of forerunner electron beam during interaction of ion beam pulse with plasma". United States. doi:10.1063/1.5002688. https://www.osti.gov/servlets/purl/1433304.
@article{osti_1433304,
title = {Generation of forerunner electron beam during interaction of ion beam pulse with plasma},
author = {Hara, Kentaro and Kaganovich, Igor D. and Startsev, Edward A.},
abstractNote = {The long-time evolution of the two-stream instability of a cold tenuous ion beam pulse propagating through the background plasma with density much higher than the ion beam density is investigated using a large-scale one-dimensional electrostatic kinetic simulation. The three stages of the instability are investigated in detail. After the initial linear growth and saturation by the electron trapping, a portion of the initially trapped electrons becomes detrapped and moves ahead of the ion beam pulse forming a forerunner electron beam, which causes a secondary two-stream instability that preheats the upstream plasma electrons. Consequently, the self-consistent nonlinear-driven turbulent state is set up at the head of the ion beam pulse with the saturated plasma wave sustained by the influx of the cold electrons from upstream of the beam that lasts until the final stage when the beam ions become trapped by the plasma wave. Finally, the beam ion trapping leads to the nonlinear heating of the beam ions that eventually extinguishes the instability.},
doi = {10.1063/1.5002688},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 1,
volume = 25,
place = {United States},
year = {2018},
month = {1}
}

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

Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

Figures / Tables:

FIG. 1. FIG. 1.: Overview of the electron acceleration due to the two-stream instability caused by the neutralized ion beam at different times indicated in the top legends, a small 15cm long window out of a 15m long computational domain is shown. Shown are (a) the potential, (b) the phase space ofmore » electrons, and (c) the phase space of the ion beam in the beam frame, v− vb, x− vbt. The electron phase space at three different times are shown in (d). t = 0 is chosen to be the time when forward moving electrons, namely, the forerunner electrons, are generated after the saturation of the initial instability, which is approximately 200 ns after the injection of the ion beam pulse into the plasma.« less

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