Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session BO05: Laser Plasma Instabilities
9:30 AM–12:30 PM,
Monday, October 17, 2022
Room: Ballroom 111 B
Chair: John Palastro, University of Rochester
Abstract: BO05.00007 : Influence of random phase plates temporal smoothing on the growth of the Backward stimulated Brillouin scatter
10:42 AM–10:54 AM
Presenter:
Charles Ruyer
(CEA)
Authors:
Charles Ruyer
(CEA)
Adrien Fusaro
(CEA, DAM, DIF)
Remy Capdessus
(CEA, DAM, DIF)
Arnaud Debayle
(CEA, DAM, DIF)
Pascal P Loiseau
(CEA de Bruyeres-le-Chatel)
Paul-Edouard Masson-Laborde
(CEA de Bruyeres-le-Chatel)
Based on a previous work [1], we derive analytical dispersion relations of the backward stimulated Brillouin scattering (BSBS) that accounts for spatial temporal beam smoothing and the phase plate randomness [2]. Quantifying the instability variability that results from the phase plates is shown to be crucial for understanding quantitatively the backscattering temporal and spatial growth as well as the asymptotic reflectivity. A simple analytical correction to the plane wave spatial gain is extracted from our theory for a simple and effective reflectivity prediction that includes the impact of smoothing techniques. Validated by a large number of three dimensional hydrodynamic paraxial (Hera) simulations [3] and experimental data [4], our model shades a new light on the long-time studied BSBS deleterious to many high energy experimental studies related to the physics of inertial confinement fusion [5].
[1] C. Ruyer, A. Debayle et. al., Phys. Plasmas 28, 052701 (2021)
[2] H. A. Rose and D. F. DuBois, Phys. Fluids B 5, 590 (1993)
[3] P. Loiseau, O. Morice, et. al., Phys. Rev. Lett. 97, 205001 (2006)
[4] L. Divol, R. L. Berger et. al., Phys. Plasmas 15, 056313 (2008)
[5] C. Ruyer, R. Capdessus et. al., submitted to PRX
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