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Title: Laser Amplification in Strongly Magnetized Plasma

Abstract

In this work, we consider backscattering of laser pulses in strongly magnetized plasma mediated by kinetic magnetohydrodynamic waves. Magnetized low-frequency (MLF) scattering, which can occur when the external magnetic field is neither perpendicular nor parallel to the laser propagation direction, provides an instability growth rate higher than Raman scattering and a frequency downshift comparable to Brillouin scattering. In addition to the high growth rate, which allows smaller plasmas, and the 0.1%–2% frequency downshift, which permits a wide range of pump sources, MLF scattering is an ideal candidate for amplification because the process supports an exceptionally large bandwidth, which particle-in-cell simulations show produces ultrashort durations. Under some conditions, MLF scattering also becomes the dominant spontaneous backscatter instability, with implications for magnetized laser-confinement experiments.

Authors:
 [1];  [2];  [1];  [3]
  1. Princeton Univ., NJ (United States)
  2. Princeton Univ., NJ (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Princeton Univ., NJ (United States); Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1543071
Alternate Identifier(s):
OSTI ID: 1546461
Report Number(s):
LLNL-JRNL-765842
Journal ID: ISSN 0031-9007; PRLTAO; 955270
Grant/Contract Number:  
AC52-07NA27344; NA0002948; SC0017907; DENA0002948; 19-ERD-038
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 123; Journal Issue: 2; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Edwards, Matthew R., Shi, Yuan, Mikhailova, Julia M., and Fisch, Nathaniel J. Laser Amplification in Strongly Magnetized Plasma. United States: N. p., 2019. Web. doi:10.1103/PhysRevLett.123.025001.
Edwards, Matthew R., Shi, Yuan, Mikhailova, Julia M., & Fisch, Nathaniel J. Laser Amplification in Strongly Magnetized Plasma. United States. doi:10.1103/PhysRevLett.123.025001.
Edwards, Matthew R., Shi, Yuan, Mikhailova, Julia M., and Fisch, Nathaniel J. Tue . "Laser Amplification in Strongly Magnetized Plasma". United States. doi:10.1103/PhysRevLett.123.025001.
@article{osti_1543071,
title = {Laser Amplification in Strongly Magnetized Plasma},
author = {Edwards, Matthew R. and Shi, Yuan and Mikhailova, Julia M. and Fisch, Nathaniel J.},
abstractNote = {In this work, we consider backscattering of laser pulses in strongly magnetized plasma mediated by kinetic magnetohydrodynamic waves. Magnetized low-frequency (MLF) scattering, which can occur when the external magnetic field is neither perpendicular nor parallel to the laser propagation direction, provides an instability growth rate higher than Raman scattering and a frequency downshift comparable to Brillouin scattering. In addition to the high growth rate, which allows smaller plasmas, and the 0.1%–2% frequency downshift, which permits a wide range of pump sources, MLF scattering is an ideal candidate for amplification because the process supports an exceptionally large bandwidth, which particle-in-cell simulations show produces ultrashort durations. Under some conditions, MLF scattering also becomes the dominant spontaneous backscatter instability, with implications for magnetized laser-confinement experiments.},
doi = {10.1103/PhysRevLett.123.025001},
journal = {Physical Review Letters},
number = 2,
volume = 123,
place = {United States},
year = {2019},
month = {7}
}

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