Abstract
The hydrodynamic behavior of thin A1 disk targets irradiated with a 1 ns frequency-tripled Nd-laser pulse is experimentally studied at irradiances ranging from 10 13 W cm -2 to 5 x 10 14 W cm -2 and compared to numerical simulations from a one-dimensional lagrangian hydrodynamic code. Velocity measurements as a function of target thickness — ranging from 0.75 μm to 25 μm — are performed by means of time and space resolved X-ray backlighting. Comparison is done with free surface velocity measurements deduced from visible interferometry and streak shadowgraphy, and with dense target velocities inferred from the double-foil technique. Results are discussed in terms of preheat effects, beam inhomogeneities and energy smoothing.
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