Modeling the Effects of Laser-Plasma Interactions on Drive Symmetry in Gas-Filled Hohlraums at Nova.

Physics – Plasma Physics

Scientific paper

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Scientific paper

Modeling of drive-symmetry experiments in gas-filled hohlraums at Nova are currently being pursued to verify the accuracy of design calculations for the National Ignition Facility (NIF). X-ray images of imploded capsules are used to evaluate time-integrated symmetry. LASNEX integrated calculations of these experiments include the propagation of the laser through the window and gas and the energy deposition in the hohlraum walls and its reradiation as x-rays, as well as the dynamics of the window, gas, hohlraum walls and capsule. In addition, when SRS and SBS losses are included along with spot motion (probably caused by plasma-induced beam steering), excellent agreement with experiment is obtained. Work performed for the U. S. Department of Energy under Contract Nos. W--7405--ENG--36 and W--7405--ENG--48.

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