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Refraction-enhanced x-ray radiography (REXR) is used to infer shock-wavepositions of more than one shock wave, launched by a multiple-picket pulse in aplanar plastic foil. This includes locating shock waves before the shocksmerge, during the early time and the main drive of the laser pulse that is notpossible with the velocity interferometer system for any reflector. Simulationspresented in this paper of REXR show that it is necessary to incorporaterefraction and attenuation of x rays along with the appropriate opacity andrefractive-index tables to interpret experimental images. Simulated REXR showsgood agreement with an experiment done on the OMEGA laser facility to image ashock wave. REXR can be applied to design multiple-picket pulses with a betterunderstanding of the shock locations. This will be beneficial to obtain therequired adiabats for inertial confinement fusion implosions.

Simulated Refraction-Enhanced X-Ray Radiography of Laser-Driven Shocks