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Title: Saturation of cross-beam energy transfer for multispeckled laser beams involving both ion and electron dynamics

Abstract

The nonlinear saturation of crossed-beam energy transfer (CBET) for multispeckled laser beams crossing at arbitrary angles is examined using vector particle-in-cell simulations. CBET is found to saturate on fast (~10s of picosecond) time scales involving ion trapping and excitation of oblique forward stimulated Raman scattering (FSRS). Ion trapping reduces wave damping and speckle interaction increases wave coherence length, together enhancing energy transfer; ion acoustic wave (IAW) breakup in the direction transverse to the wavenumber increases wave damping and contributes to CBET saturation. Here, the seed beam can become unstable to oblique FSRS, which leads to beam deflection at a large angle and a frequency downshift (by the plasma frequency).

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1];  [2]
+ Show Author Affiliations
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Arlington Heights, IL (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1570628
Alternate Identifier(s):
OSTI ID: 1557378
Report Number(s):
LA-UR-19-24839
Journal ID: ISSN 1070-664X
Grant/Contract Number:  
89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 8; 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

Yin, Lin, Albright, Brian James, Stark, David James, Nystrom, William David, Bird, Robert Francis, and Bowers, Kevin J. Saturation of cross-beam energy transfer for multispeckled laser beams involving both ion and electron dynamics. United States: N. p., 2019. Web. doi:10.1063/1.5111334.
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Yin, Lin, Albright, Brian James, Stark, David James, Nystrom, William David, Bird, Robert Francis, & Bowers, Kevin J. Saturation of cross-beam energy transfer for multispeckled laser beams involving both ion and electron dynamics. United States. doi:10.1063/1.5111334.
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Yin, Lin, Albright, Brian James, Stark, David James, Nystrom, William David, Bird, Robert Francis, and Bowers, Kevin J. Thu . "Saturation of cross-beam energy transfer for multispeckled laser beams involving both ion and electron dynamics". United States. doi:10.1063/1.5111334.
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@article{osti_1570628,
title = {Saturation of cross-beam energy transfer for multispeckled laser beams involving both ion and electron dynamics},
author = {Yin, Lin and Albright, Brian James and Stark, David James and Nystrom, William David and Bird, Robert Francis and Bowers, Kevin J.},
abstractNote = {The nonlinear saturation of crossed-beam energy transfer (CBET) for multispeckled laser beams crossing at arbitrary angles is examined using vector particle-in-cell simulations. CBET is found to saturate on fast (~10s of picosecond) time scales involving ion trapping and excitation of oblique forward stimulated Raman scattering (FSRS). Ion trapping reduces wave damping and speckle interaction increases wave coherence length, together enhancing energy transfer; ion acoustic wave (IAW) breakup in the direction transverse to the wavenumber increases wave damping and contributes to CBET saturation. Here, the seed beam can become unstable to oblique FSRS, which leads to beam deflection at a large angle and a frequency downshift (by the plasma frequency).},
doi = {10.1063/1.5111334},
journal = {Physics of Plasmas},
number = 8,
volume = 26,
place = {United States},
year = {2019},
month = {8}
}
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DOI:  10.1063/1.5111334
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