Speaker
Description
Shocks induced by fast high-fluence electron beam deposition on Aluminum targets: hydrodynamic simulations initialized by electron beam measurements.
N. Szalek, B. Bicrel, B. Cassany, A. Galtié, J. Gardelle and D. Hébert.
CEA/CESTA, 15 avenue des Sablières, CS 60001, 33116, Le Barp, France
We present recent results of fast hydrodynamic response of aluminum at CESTA. We are using the CESAR generator which delivers single shots (≈ 800 keV, ≈ 300 kA, 60 ns) electron beams. After focusing by an external magnetic field towards an aluminum target located inside an air-filled chamber, fast beam energy deposition produces a shock-wave and vaporizes matter. Then, the rear face of the target moves quickly, and its velocity is measured by Photonic Doppler Velocimetry (PDV). Recently, we increased beam fluence (> 500 cal/cm2) and we improved our knowledge of the beam parameters at the target location. Thanks to several new diagnostics, such as a Cerenkov imaging line, we have improved the initialization of beam-target simulation tools. The energy deposition is computed with the Monte Carlo code DIANE and we perform hydrodynamic calculations with the code HESIONE. One of the main outputs of the latter is the velocity of the rear face of the target, at given radial positions and as a function of time, which was compared with PDV data. We obtained good agreement with the experiment for the maximum velocity, which is within the experimental error bars. However, we observed differences in computed and measured temporal shapes for the two equations of state of aluminum we have tested: BLF (Bushman-Lomonosov-Fortov) and SESAME 3720 table.
