Simulation of stimulated Brillouin scattering and stimulated Raman scattering in shock ignition
- Univ. of Rochester, NY (United States). Lab. for Laser Energetics and Dept. of Mechanical Engineering; Inst. of Applied Physics and Computational Mathematics (IAPCM), Beijing (China)
- Univ. of Rochester, NY (United States). Lab. for Laser Energetics and Dept. of Mechanical Engineering
- Univ. of Rochester, NY (United States). Lab. for Laser Energetics, Dept. of Physics and Astronomy and Dept. of Mechanical Engineering
In this work, we study stimulated Brillouin scattering (SBS) and stimulated Raman scattering (SRS) in shock ignition by comparing fluid and particle-in-cell (PIC) simulations. Under typical parameters for the OMEGA experiments [Theobald et al., Phys. Plasmas 19, 102706 (2012)], a series of 1D fluid simulations with laser intensities ranging between 2 x 1015 and 2 x 1016W/cm2 finds that SBS is the dominant instability, which increases significantly with the incident intensity. Strong pump depletion caused by SBS and SRS limits the transmitted intensity at the 0.17nc to be less than 3.5 x 1015W/cm2. The PIC simulations show similar physics but with higher saturation levels for SBS and SRS convective modes and stronger pump depletion due to higher seed levels for the electromagnetic fields in PIC codes. Plasma flow profiles are found to be important in proper modeling of SBS and limiting its reflectivity in both the fluid and PIC simulations.
- Research Organization:
- Univ. of Rochester, NY (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC)
- Contributing Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Grant/Contract Number:
- FC02-04ER54789; SC0012316; PHY-1314734; 11129503
- OSTI ID:
- 1470308
- Alternate ID(s):
- OSTI ID: 1246533
- Journal Information:
- Physics of Plasmas, Vol. 23, Issue 4; ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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