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Physical Review E: Statistical, Nonlinear, and Soft Matter Physics 75 (2007) 065401
Direct evidence of strongly inhomogeneous energy deposition in target heating with laser-produced ion beams
E. Brambrink1, T. Schlegel2, G. Malka3, K. U. Amthor4, M. M. Aléonard3, G. Claverie3, M. Gerbaux3, F. Gobet3, F. Hannachi3, V. Méot5, P. Morel5, P. Nicolai6, J. N. Scheurer3, M. Tarisien3, V. Tikhonchuk6, P. Audebert1

We report on strong nonuniformities in target heating with intense, laser-produced proton beams. The observed inhomogeneity in energy deposition can strongly perturb equation of state EOS measurements with laser-accelerated ions which are planned in several laboratories. Interferometric measurements of the target expansion show different expansion velocities on the front and rear surfaces, indicating a strong difference in local temperature. The nonuniformity indicates at an additional heating mechanism, which seems to originate from electrons in the keV range.
1 :  LULI - Laboratoire pour l'utilisation des lasers intenses
2 :  GSI - Gesellschaft für Schwerionenforschung mbH
3 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
4 :  IOQ - Institut für Optik und Quantenelektronik
5 :  DAM/DIF - DAM Île-de-France
6 :  CELIA - Centre d'Etudes Lasers Intenses et Applications
Physique/Physique Nucléaire Expérimentale

Physique/Physique/Physique des plasmas