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.
Brambrink
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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
Schlegel
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T
Malka
G
G
Amthor
K U
KU
Aléonard
M M
MM
Claverie
G
G
Gerbaux
M
M
Gobet
F
F
Hannachi
F
F
Méot
V
V
Morel
P
P
Nicolai
P
P
Scheurer
J N
JN
Tarisien
M
M
Tikhonchuk
V
V
Audebert
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P