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Published on: February 14, 2014
Backscatter spectra measurements of the two beams on the same cone on Shenguang-III laser facility
Weiyi Zha1, Dong Yang1, Tao Xu1
1Research Center of Laser Fusion, China Academy of Engineering Physics, Mianyang, Sichuan 621900, China.
Abstract:
In laser driven hohlraums, laser beams on the same incident cone may have different beam and plasma conditions, causing beam-to-beam backscatter difference and subsequent azimuthal variations in the x-ray drive on the capsule. To elucidate the large variation of backscatter proportion from beam to beam in some gas-filled hohlraum shots on Shenguang-III, two 28.5° beams have been measured with the Stimulated Raman Scattering (SRS) time-resolved spectra. A bifurcated fiber is used to sample two beams and then coupled to a spectrometer and streak camera combination to reduce the cost. The SRS spectra, characterized by a broad wavelength, were further corrected considering the temporal distortion and intensity modulation caused by components along the light path. This measurement will improve the understanding of the beam propagation inside the hohlraum and related laser plasma instabilities.
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