Modeling of energy transfer between two crossing smoothed laser beams in a plasma with flow profile

9th International Conference on Inertial Fusion Sciences and Applications

Colaitis, A.^1 ; Hüller, S.^2 ; Tikhonchuk, V.T.^1 ; Pesme, D.^2 ; Duchateau, G.^1 ; Porzio, A.^2,3

Centre Lasers Intenses et Applications, Université de Bordeaux CNRS CEA, Talence, France^1

Centre de Physique Thorique, CNRS, Ecole Polytechnique, Palaiseau, France^2

LAGA, Institut Galilée, Université Paris 13 CNRS, Villetaneuse, France^3

关键词: Complex geometrical optics;    Flow gradients;    Hydrodynamics codes;    New approaches;    Plasma configuration;    Resonant transfer;    Smoothing methods;    Transient periods;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/717/1/012096/pdf
DOI  :  10.1088/1742-6596/717/1/012096

来源: IOP

【 摘 要 】

We study the crossed beam energy transfer (CBET) between laser fields generated by optical smoothing methods. The energy transfer, as well as the angular distribution of the outgoing light fields are investigated for two incident smoothed laser beams in a plasma with a flow gradient, allowing for resonant transfer close to the sonic point. Simulations with the code HARMONY based on time-dependent paraxial light propagation are compared to simulations using a new approach based on paraxial complex geometrical optics (PCGO). Both approaches show good agreement for the average energy transfer past a short transient period, which is a promising result for the use of the PCGO method as a module within a hydrodynamics code to efficiently compute CBET in mm-scale plasma configurations. Statistical aspects related to role of laser speckles in CBET are considered via an ensemble of different phase plate realizations.