Direct evidence of strongly inhomogeneous energy deposition in target heating with laser-produced ion beams.
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.
Laboratoire pour l'Utilisation des Lasers Intenses (LULI), Unité Mixte No. 7605 CNRS-CEA-Ecole Polytechnique - Université Pierre et Marie Curie, Palaiseau, France. erik.brambrink@polytechnique.fr
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Brambrink
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Schlegel
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Malka
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Amthor
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Aléonard
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Claverie
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Gerbaux
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Gobet
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Hannachi
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Méot
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Morel
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Nicolai
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Scheurer
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Tarisien
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Tikhonchuk
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Audebert