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Title: Thresholds of absolute instabilities driven by a broadband laser

Abstract

Absolute instability thresholds for stimulated Raman scattering and two-plasmon decay driven by a broadband laser pulse are evaluated numerically. The scalings of the calculated thresholds with density scale length, temperature, and central wavelength are qualitatively similar to existing analytic results. The threshold values, yet, reflect significant quantitative differences. Comparisons between thresholds calculated for various broadband power spectra suggest a universal scaling of the threshold intensity with laser coherence time ($$\tau_{c}$$). For SRS I thr ∝ $$\tau_{c}^{-1/3}$$, and for TPD I thr ∝ $$\tau_{c}^{-1/2}$$ .

Authors:
 [1]; ORCiD logo [1];  [2];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
  2. Univ. of Alberta, Edmonton, AB (Canada)
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1530731
Alternate Identifier(s):
OSTI ID: 1525561
Report Number(s):
2019-82, 1505
Journal ID: ISSN 1070-664X; 2019-82, 1505, 2465
Grant/Contract Number:  
NA0003856
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 6; 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

Follett, R. K., Shaw, J. G., Myatt, J. F., Dorrer, C., Froula, D. H., and Palastro, J. P. Thresholds of absolute instabilities driven by a broadband laser. United States: N. p., 2019. Web. doi:10.1063/1.5098479.
Follett, R. K., Shaw, J. G., Myatt, J. F., Dorrer, C., Froula, D. H., & Palastro, J. P. Thresholds of absolute instabilities driven by a broadband laser. United States. doi:10.1063/1.5098479.
Follett, R. K., Shaw, J. G., Myatt, J. F., Dorrer, C., Froula, D. H., and Palastro, J. P. Tue . "Thresholds of absolute instabilities driven by a broadband laser". United States. doi:10.1063/1.5098479.
@article{osti_1530731,
title = {Thresholds of absolute instabilities driven by a broadband laser},
author = {Follett, R. K. and Shaw, J. G. and Myatt, J. F. and Dorrer, C. and Froula, D. H. and Palastro, J. P.},
abstractNote = {Absolute instability thresholds for stimulated Raman scattering and two-plasmon decay driven by a broadband laser pulse are evaluated numerically. The scalings of the calculated thresholds with density scale length, temperature, and central wavelength are qualitatively similar to existing analytic results. The threshold values, yet, reflect significant quantitative differences. Comparisons between thresholds calculated for various broadband power spectra suggest a universal scaling of the threshold intensity with laser coherence time ($\tau_{c}$). For SRS Ithr ∝ $\tau_{c}^{-1/3}$, and for TPD Ithr ∝ $\tau_{c}^{-1/2}$ .},
doi = {10.1063/1.5098479},
journal = {Physics of Plasmas},
number = 6,
volume = 26,
place = {United States},
year = {2019},
month = {6}
}

Journal Article:
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This content will become publicly available on June 11, 2020
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