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Title: Harnessing the relativistic Buneman instability for laser-ion acceleration in the transparency regime

Here we examine the relativistic Buneman instability in systems relevant to high-intensity laser-plasma interactions under conditions of relativistically-induced transparency, as this instability can generate large-amplitude electrostatic waves at low frequencies that are pertinent to ion dynamics in these systems. Ion flows are shown to significantly alter the range of unstable wave numbers and to increase the phase velocities of the unstable modes; we particularly highlight the relativistic effects from both the ion and electron (with transverse motion) populations. These findings are related to the mode structure seen in particle-in-cell simulation results of a short-pulse laser breaking through an initially opaque target with the onset of relativistic transparency. Additionally, driving mechanisms from free energy present in density and velocity gradients are shown to be capable of significantly enhancing the growth rates, and these instabilities furthermore extend the breadth of the unstable wave number range. We discuss how the transverse self-generated magnetic fields characteristic of short-pulse interactions can potentially constrain the unstable wave numbers in a non-trivial manner.
Authors:
ORCiD logo [1] ;  [1] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-18-21829
Journal ID: ISSN 1070-664X
Grant/Contract Number:
89233218CNA000001
Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 25; Journal Issue: 6; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE; LANL Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; plasma waves; plasmas; free energy; particle-in-cell method; wave mechanics; dispersion function; velocity gradient tensor; relativistic effects; laser plasma interactions; plasma instabilities
OSTI Identifier:
1482935
Alternate Identifier(s):
OSTI ID: 1439914

Stark, D. J., Yin, L., and Albright, B. J.. Harnessing the relativistic Buneman instability for laser-ion acceleration in the transparency regime. United States: N. p., Web. doi:10.1063/1.5028128.
Stark, D. J., Yin, L., & Albright, B. J.. Harnessing the relativistic Buneman instability for laser-ion acceleration in the transparency regime. United States. doi:10.1063/1.5028128.
Stark, D. J., Yin, L., and Albright, B. J.. 2018. "Harnessing the relativistic Buneman instability for laser-ion acceleration in the transparency regime". United States. doi:10.1063/1.5028128.
@article{osti_1482935,
title = {Harnessing the relativistic Buneman instability for laser-ion acceleration in the transparency regime},
author = {Stark, D. J. and Yin, L. and Albright, B. J.},
abstractNote = {Here we examine the relativistic Buneman instability in systems relevant to high-intensity laser-plasma interactions under conditions of relativistically-induced transparency, as this instability can generate large-amplitude electrostatic waves at low frequencies that are pertinent to ion dynamics in these systems. Ion flows are shown to significantly alter the range of unstable wave numbers and to increase the phase velocities of the unstable modes; we particularly highlight the relativistic effects from both the ion and electron (with transverse motion) populations. These findings are related to the mode structure seen in particle-in-cell simulation results of a short-pulse laser breaking through an initially opaque target with the onset of relativistic transparency. Additionally, driving mechanisms from free energy present in density and velocity gradients are shown to be capable of significantly enhancing the growth rates, and these instabilities furthermore extend the breadth of the unstable wave number range. We discuss how the transverse self-generated magnetic fields characteristic of short-pulse interactions can potentially constrain the unstable wave numbers in a non-trivial manner.},
doi = {10.1063/1.5028128},
journal = {Physics of Plasmas},
number = 6,
volume = 25,
place = {United States},
year = {2018},
month = {6}
}

Works referenced in this record:

Energetic proton generation in ultra-intense laser�solid interactions
journal, February 2001
  • Wilks, S. C.; Langdon, A. B.; Cowan, T. E.
  • Physics of Plasmas, Vol. 8, Issue 2, p. 542-549
  • DOI: 10.1063/1.1333697