Flash x-ray units are used to diagnose pulsed power driven experiments on the Pegasus machine at Los Alamos.
A variety of metal multilayers was exposed to high x -ray flux using Sandia National Laboratories' PROTO II machine in the gas puff mode.Fluxes incident on the multilayers above 700 MW /cm2 in total radiation, in nominal 20 ns pulses, were realized.The neon hydrogen-and helium -like resonance lines were used to probe the x -ray reflectivity properties of the multilayers as they underwent change of state during the heating pulse. A fluorescer -fiber optic-streak camera system was used to monitor the changes in x -ray reflectivity as a function of time and irradiance.Preliminary results are presented for a W/C multilayer.Work in progress to model the experiment is discussed.
program uses capacitively driven low voltage, inductive-storage pulse power to implode cylindrical targets for hydrodynamics experiments. Once a precision driver liner was characterized an experimental series characterizing the aluminum target dynamics was performed. The target was developed for shock-induced quasi-particle ejecta experiments including holography. The concept for the Liner shock experiment is that the driver liner is used to impact the target liner which then accelerates toward a collimator with a slit in it. A shock wave is set up in the target liner and as the shock emerges from the back side of the target liner, ejecta are generated. By taking a laser hologram the particle distribution of the ejecta are hoped to be determined. The goal for the second experimental series was to characterize the target dynamics and not to measure and generate the ejecta. Only the results from the third shot, Pegasus 11-26 fired April 26th, 1994, from the series will be discussed in detail. The second experimental series successfully characterized the target dynamics necessary to move forward towards our planned quasi-ejecta experiments.
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