Experimental Investigation of Smoothing by Spectral Dispersion
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چکیده
LLE Review, Volume 79 149 In the direct-drive approach to inertial confinement fusion (ICF), capsules are irradiated directly by a large number of symmetrically arranged laser beams.1,2 Nonuniformities in the laser irradiation may seed the Rayleigh–Taylor hydrodynamic instability, which degrades target performance;3 therefore, a combination of beam-smoothing techniques is employed to achieve the high irradiation uniformity required for directdrive laser-fusion experiments. These techniques, which include two-dimensional smoothing by spectral dispersion (2-D SSD),4–6 distributed phase plates (DPP’s),7,8 polarization smoothing (DPR’s),9–11 and multiple-beam overlap, will also be implemented on the 1.8-MJ, 351-nm, 192-beam National Ignition Facility (NIF),12 which is currently under construction at the Lawrence Livermore National Laboratory. Directdrive laser fusion requires a high degree of laser-irradiation uniformity on target: the rms irradiation nonuniformity must be below 1% when the laser intensity has been averaged over a few hundred picoseconds.2,5
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