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Modeling stimulated Brillouin scattering in the underdense corona of a direct drive inertial confinement fusion target.
- Source :
- Physics of Plasmas; Jul2004, Vol. 11 Issue 7, p3394-3403, 10p
- Publication Year :
- 2004
-
Abstract
- Motivated by recent long scale-length single- and multiple-beam experiments conducted on LLE’s OMEGA laser system [W. Seka et al., Phys. Rev. Lett. 89, 175002 (2002)], we have simulated backward stimulated Brillouin scattering (SBS) in inhomogeneous direct drive plasmas where a critical surface is present at all times. This was achieved by adapting pF3D, a parallel, three-dimensional laser–plasma interaction code developed at the Lawrence Livermore National Laboratory [R. L. Berger et al., Phys. Plasmas 5, 4337 (1998)]. The shortcomings of the paraxial approximation, inherent in pF3D, were identified and circumvented via a practical approach that has led to an improved understanding of the experiments. The results show a qualitative agreement between the simulated and experimental SBS backscattered power reflectivity, with the conclusion that the time dependence of the SBS reflectivity is governed by target hydrodynamics and a quantitative agreement in the blue-shift in the frequency of reflected light. The simulations have also shown a sensitivity of the backscattered reflectivity to the amplitude of the specularly reflected signal of an “opposing” beam. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1070664X
- Volume :
- 11
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Physics of Plasmas
- Publication Type :
- Academic Journal
- Accession number :
- 13472494
- Full Text :
- https://doi.org/10.1063/1.1755708