Berlin 2005 – wissenschaftliches Programm
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SYLP: Relativistische Laser-Plasma-Physik
SYLP 2: Relativistische Laser-Plasma-Physik 2
SYLP 2.5: Vortrag
Samstag, 5. März 2005, 16:00–16:20, HU Senatssaal
Charge distributions of ions accelerated from thin foils irradiated by high-intensity laser pulses — •Jörg Schreiber1,2, Florian Grüner1, Ulrich Schramm1, Michael Geissler2, Manuel Hegelich3, Jim Cobble3, Erik Brambrink4, Julien Fuchs5,6, Patrick Audebert5, Dieter Habs1, and Klaus Witte2 — 1LMU München, Garching, Germany — 2MPI für Quantenoptik, Garching, Germany — 3Los Alamos Natl. Lab, Los Alamos, USA — 4TU Darmstadt, Darmstadt, Germany — 5LULI, CNRS-CEA-École Polytechnique-Univ. Paris VI, Palaiseau, France — 6University of Nevada, Reno, USA
We report on measurements of spectra and charge state distributions of ions accelerated from thin foils irradiated by ultrashort (300fs) high-intensity (6×1019W/cm2) laser pulses. The foils were resistively heated to remove the light surface contaminants. Sandwich targets consisting of a 25-µm thick tungsten layer, a 2-nm thin beryllium layer, and again a tungsten layer whose thickness was varied were used. Among the spectra of beryllium ions, peaked energy spectra of oxygen and argon ions corresponding to the equilibrium distribution after propagation through matter were observed [1]. For the found agreement we suggest an explanation in terms of starting positions of the detected ions underneath the rear-surface. Among the sandwich target geometry, a variety of different target materials was investigated to crosscheck spectra and charge state distributions of different elements in terms of the proposed explanation. Partially funded by DFG TR18.
[1] J. Schreiber et al., Appl. Phys. B, (2004).