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Title: Amplification due to two-stream instability of self-electric and magnetic fields of an ion beam propagating in background plasma

Abstract

Propagation of charged particle beams in background plasma as a method of space charge neutralization has been shown to achieve a high degree of charge and current neutralization and therefore enables nearly ballistic propagation and focusing of charged particle beams. Correspondingly, the use of plasmas for propagation of charged particle beams has important applications for transport and focusing of intense particle beams in inertial fusion and high energy density laboratory plasma physics. However, the streaming of beam ions through a background plasma can lead to the development of two-stream instability between the beam ions and the plasma electrons. The beam electric and magnetic fields enhanced by the two-stream instability can lead to defocusing of the ion beam. Using particle-in-cell simulations, we study the scaling of the instability-driven self-electromagnetic fields and consequent defocusing forces with the background plasma density and beam ion mass. In conclusion, we identify plasma parameters where the defocusing forces can be reduced.

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1]
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  1. 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
OSTI Identifier:
1464514
Alternate Identifier(s):
OSTI ID: 1438971
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 5; 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

Tokluoglu, Erinc K., Kaganovich, Igor D., Carlsson, Johan A., Hara, Kentaro, and Startsev, Edward A. Amplification due to two-stream instability of self-electric and magnetic fields of an ion beam propagating in background plasma. United States: N. p., 2018. Web. doi:10.1063/1.5038878.
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Tokluoglu, Erinc K., Kaganovich, Igor D., Carlsson, Johan A., Hara, Kentaro, & Startsev, Edward A. Amplification due to two-stream instability of self-electric and magnetic fields of an ion beam propagating in background plasma. United States. https://doi.org/10.1063/1.5038878
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Tokluoglu, Erinc K., Kaganovich, Igor D., Carlsson, Johan A., Hara, Kentaro, and Startsev, Edward A. Thu . "Amplification due to two-stream instability of self-electric and magnetic fields of an ion beam propagating in background plasma". United States. https://doi.org/10.1063/1.5038878. https://www.osti.gov/servlets/purl/1464514.
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@article{osti_1464514,
title = {Amplification due to two-stream instability of self-electric and magnetic fields of an ion beam propagating in background plasma},
author = {Tokluoglu, Erinc K. and Kaganovich, Igor D. and Carlsson, Johan A. and Hara, Kentaro and Startsev, Edward A.},
abstractNote = {Propagation of charged particle beams in background plasma as a method of space charge neutralization has been shown to achieve a high degree of charge and current neutralization and therefore enables nearly ballistic propagation and focusing of charged particle beams. Correspondingly, the use of plasmas for propagation of charged particle beams has important applications for transport and focusing of intense particle beams in inertial fusion and high energy density laboratory plasma physics. However, the streaming of beam ions through a background plasma can lead to the development of two-stream instability between the beam ions and the plasma electrons. The beam electric and magnetic fields enhanced by the two-stream instability can lead to defocusing of the ion beam. Using particle-in-cell simulations, we study the scaling of the instability-driven self-electromagnetic fields and consequent defocusing forces with the background plasma density and beam ion mass. In conclusion, we identify plasma parameters where the defocusing forces can be reduced.},
doi = {10.1063/1.5038878},
journal = {Physics of Plasmas},
number = 5,
volume = 25,
place = {United States},
year = {Thu May 24 00:00:00 EDT 2018},
month = {Thu May 24 00:00:00 EDT 2018}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1063/1.5038878
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Cited by: 8 works
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Figures / Tables:

Fig. 1 Fig. 1: Color plot of the ion beam density profile obtained in the two-dimensional PIC simulations in Cartesian coordinates; an intense proton (H+) beam pulse is injected into plasma; the initial beam pulse radial and longitudinal profile is a Gaussian, $n$$b$($x,z$)=$n$$b$0exp(−$x$2/$r^{2}_{b}$−$z$2/$l^{2}_{b}$), where $n$$p$=1.0 x 1012cm−3, $n$$b$=2 x 1010 cm−3, $r$$b$=2 cm, characteristicmore » pulse duration $t$$pulse$=$l$$b$/$v$$b$=4.44 $ns$, $v$$b$ = $c$/2 (a) prior to instability, and t = 16 ns; (b) after 6 m of propagation (t = 40 ns) in plasma when instability develops and distorts the initial beam profile.« less
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