Modeling Stimulated Brillouin Scattering in the Underdense Corona of a Direct Drive Inertial Confinement Fusion Target
- Laboratory for Laser Energetics, University of Rochester, Rochester, NY
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 in the blue-shoft 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.
- Research Organization:
- Laboratory for Laser Energetics
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FC52-92SF19460
- OSTI ID:
- 825200
- Report Number(s):
- DOE/SF-19460-539; 1457; 2003-184
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 7 Vol. 11
- Country of Publication:
- United States
- Language:
- English
Similar Records
Modeling stimulated Brillouin backscatter from outer-cone quads across multiple inertial confinement fusion hohlraum designs
Modeling the Backscatter and Transmitted Light of High Power Smoothed Beams with pF3D, a Massively Parallel Laser Plasma Interaction Code