Statistical theory of a near-forward stimulated Brillouin scattering driven by a spatially and temporally smoothed laser beam
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F10974938%3A_____%2F25%3A25_89_06" target="_blank" >RIV/10974938:_____/25:25_89_06 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1063/5.0245656" target="_blank" >https://doi.org/10.1063/5.0245656</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/5.0245656" target="_blank" >10.1063/5.0245656</a>
Alternative languages
Result language
angličtina
Original language name
Statistical theory of a near-forward stimulated Brillouin scattering driven by a spatially and temporally smoothed laser beam
Original language description
A model predicting the spatial gain of the near-forward stimulated Brillouin scattering excited by a laser beam smoothed by a random phase plate is extended to the temporal smoothing by spectral dispersion and polarization smoothing schemes relevant to high-energy laser facilities. Both smoothing schemes partially stabilize the beam spray amplification by reducing the beamlet correlations. A finite laser bandwidth causes a frequency shift of the ion-acoustic resonance due to internal competition between the amplified scattered waves with different frequencies. Simple analytical estimates of the convective gain are provided for all smoothing schemes. The model predictions are confirmed with three-dimensional paraxial simulations and applied to two recent experiments in the indirect and direct drive geometry. The forward Brillouin scattering may produce a strong beam spraying in the inertial confinement fusion experiments and can be controlled by the laser spectral bandwidth. The model revises the previous estimates of the laser bandwidth effect on the forward Brillouin scattering in plasma and provides a new quantitative evaluation of the mitigation effect. It also predicts an anisotropic beam spray growth depending on the flow orientation and on the temporal smoothing that is used. (c) 2025 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/4.0/).
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
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Continuities
R - Projekt Ramcoveho programu EK
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physics of Plasmas
ISSN
1070-664X
e-ISSN
1089-7674
Volume of the periodical
32
Issue of the periodical within the volume
2
Country of publishing house
US - UNITED STATES
Number of pages
16
Pages from-to
022112(1-16)
UT code for WoS article
001468447800002
EID of the result in the Scopus database
2-s2.0-85218446946