Time-Dependent Electron Thermal Flux Inhibition in Direct-Drive Laser Implosions

OAK B204 We simulate direct-drive CH target implosions with square laser pulses by a one-dimensional Fokker-Planck solver combined with a hydrodynamic code and compare the results with those stimulated by the flux-limited Spitzer-Harm model. We find that the electron thermal flux inhibition is time dependent, resulting in longer density scale length, larger laser absorption, and smaller growth of Rayleigh-Taylor instability. The time of peak neutron production calculated from Fokker-Planck simulations agrees with experiments for both 1-ns and 400-ps pulses