Simulation of NIF Ignition Shock Timing Diagnostics

In previous Omega experiments, time-resolved measurements of hohlraum radiation temperature were made via interferometer measurement of quartz shock velocity.$^{1}$ In the present work, the data of Ref. 1 are used to confirm the validity of two new ``synthetic diagnostics'' (rad-hydro code postprocessor simulations of the diagnostics). The synthetic VISAR provides a simulated streaked image showing time-resolved fringe shifts of a line-imaging velocity interferometer.$^{2}$ The simulated VISAR ``data'' can be unfolded to provide a recording of the shock velocity within the interior of an optically-transparent material (eg., quartz in the Ref 1 data or liquid deuterium in the NIF ignition campaign). The synthetic SOP provides a simulated intensity-time image of a streaked optical pyrometer.$^{3}$ The simulated SOP ``data'' can be unfolded to provide shock breakout times and time-resolved shock front intensity. These two synthetic diagnostics include a variety of realistic experimental and diagnostic uncertainties. Both were developed for use in a NIF simulated ignition campaign, and were utilized in a series of simulated ignition campaign ``shots'' in which the shocks were empirically tuned so as to converge to a successful simulated NIF ignition attempt. 1. R. E. Olson \textit{et al}., Rev. Sci. Instrum. 77, 10E523 (2006). 2. P. M. Celliers \textit{et al}., Rev. Sci. Instrum. 75, 4916 (2004). 3. J. A. Oertel \textit{et al}., Rev. Sci. Instrum. 70, 803 (1999).