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Strozzi, D.J.; Hinkel, D.E.; Williams, E.A.; Town, R.J.; Michel, P.A.; Divol, L.; Berger, R.L.; Moody, J.D.
Lawrence Livermore National Laboratory, Livermore, CA (United States). Funding organisation: US Department of Energy (United States)2011
Lawrence Livermore National Laboratory, Livermore, CA (United States). Funding organisation: US Department of Energy (United States)2011
AbstractAbstract
[en] Recent NIF indirect-drive experiments have shown significant Raman scattering from the inner beams. NIF data has motivated improvements to rad-hydro modeling, leading to the 'high flux model' (M. D. Rosen et al., HEDP 7, 180 (2011)). Cross-beam energy transfer (P. A. Michel et al., Phys. Plasmas 17, 056305 (2010) in the laser entrance hole is an important tool for achieving round implosions, and is uniformly distributed across the laser spot in rad-hydro simulations (but not necessarily in experiments). We find the Raman linear gain spectra computed with these plasma conditions agree well in time-dependent peak wavelength with the measured data, especially when overlapping laser-beam intensities are used. More detailed, spatially non-uniform modeling of the cross-beam transfer has been performed. The resulting gains better follow the time history of the measured backscatter. We shall present the impact of spatially non-uniform energy transfer on SRS gain. This metric is valid when amplification is in a linear regime, and so we shall also present an assessment of whether electron trapping in Langmuir waves can play a role in these shots.
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4 Nov 2011; 14 p; 53. Annual Meeting of the APS Division of Plasma Physics; Salt Lake City, UT (United States); 14-18 Nov 2011; W-7405-ENG-48; Available from https://e-reports-ext.llnl.gov/pdf/535131.pdf; PURL: https://www.osti.gov/servlets/purl/1035286/; PDF-FILE: 14; SIZE: 2.2 MBYTES
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