Demonstrating the saturation of stimulated Brillouin scattering by ion acoustic decay using fully kinetic simulations
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Univ. of California, Los Angeles, CA (United States). Dept. of Electrical Engineering
- Ecole Polytechnique Federale Lausanne (Switzlerland). Centre de Recherche en Physique des Plasma (CRPP)
- Rensselaer Polytechnic Inst., Troy, NY (United States). Dept. of Mathematical Sciences
The saturation of stimulated Brillouin scattering (SBS) by the decay to turbulence of the ion acoustic wave (IAW) that participates in the three-wave SBS interaction is demonstrated using a quasi-noiseless one-dimensional numerical solution to the Vlasov-Maxwell system of equations. This simulation technique permits careful examination of the decay process and its role in the complex evolution of SBS. Here, the IAW decay process is shown to be an effective SBS saturation mechanism. In our example, the instantaneous plasma reflectivity saturates at ~30% and drops to ~0% as a direct consequence of IAW decay. A contrasting example where the reflectivity is controlled by dephasing due to the nonlinear frequency of the IAW is also discussed.
- Research Organization:
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-07NA27344; NA0001833; FC02-04ER54789
- OSTI ID:
- 1234579
- Alternate ID(s):
- OSTI ID: 1229670
- Report Number(s):
- LLNL-JRNL-667961
- Journal Information:
- Physics of Plasmas, Vol. 22, Issue 9; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
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