Modeling of SBS and Thomson scattering measurements on CO2 gasbags (Nova) with pF3D

Details Modeling of SBS and Thomson scattering measurements on CO2 gasbags (Nova) with pF3D Modeling of SBS and Thomson scattering measurements on CO2 gasbags (Nova) with pF3D

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aps..dppwp1063d&link_type=abstract

American Physical Society, 42nd Annual Meeting of the APS Division of Plasma Physics combined with the 10th International Congre

Physics

Plasma Physics

Scientific paper

Stimulated Brillouin Backscattering (SBS) from scale-1 NOVA hohlraums (S. H. Glenzer, et. al. submitted to Phys. Rev. Lett. 1999) was shown to originate in the Au-blowoff plasma, where acoustic waves (AC) are weakly damped. Using F3D (R. L. Berger et al., Phys. Plasmas 5 (1998)), we showed that a strong saturation mechanism (here the two-ion-wave decay (TIWD) process) for AC was needed in order to recover the observed scaling of the SBS reflectivity with laser intensity and SSD bandwidth. Further experiments have been conducted at NOVA to measure both the SBS reflectivity and the ac saturation level. CO2 gasbag targets were used, in order to stay in the weakly damped regime for AC. The SBS-driven AC amplitude, using various intensities for the f/4 interaction beam, was measured with coherent Thomson scattering (TS) with a 263nm wavelength probe. Using the parallel code pF3D, we were able to simulate the propagation of the NOVA f/4 interaction beam through the entire gasbag. Acoustic wave noise fluctuations are included in the code to give the right TS value at low intensity, and a seed for SBS at higher intensities. Thus, both the SBS reflectivity and TS measurements were modeled for comparison with the experimental data. We'll show that filamentation and beam spraying are important in those experiments, and discuss the need for strong saturation mechanisms of the ac waves.

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