THE IMPACT OF THE SPECTRAL RADIATION TRANSPORT EFFECTS IN DIFFERENT APPROXIMATIONS ON THE DEVELOPMENT OF SHORT-WAVELENGTH PERTURBATIONS IN THE INERTIAL CONFINEMENT FUSION TARGETS
V. A. Lykov, E. L. Lyagina, A. A. Shestakov
VANT. Ser.: Mat. Mod. Fiz. Proc 2021. Вып.1. С. 17-28.
Using a 2D radiation hydrodynamics code, the impact of spectral radiation transport effects in different approximations on the development of short-wavelength perturbations in shell targets for the inertial confinement fusion is investigated. It is shown that the shell motion dynamics and perturbation growth rate during the target compression significantly depend on the radiation transport model. The impact of the M-band of the hohlraum X-rays on the target heat-up and development of short-wavelength perturbations under the publicly-disclosed conditions of NIF experiments with indirect-drive targets is considered. It is observed that the shell heating up by gammas from Au ion M-transitions decreases the shell density, as well as the density and pressure gradients, and leads to a weaker growth of perturbations. Results of 2D simulations of the perturbation growth with the spherical harmonic numbers 60 and 90 in multigroup radiation transport approximations are in a good agreement with data obtained in the NIF experiments with shell targets. Keywords: X-rays transport, the inertial confinement fusion problem.
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