Hannover 2010 – scientific programme
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P: Fachverband Plasmaphysik
P 14: Miscellaneous
P 14.2: Talk
Wednesday, March 10, 2010, 16:45–17:00, B 302
Efficient ion acceleration in the laser transparency regime — •Sven Steinke1, Andreas Henig2, Matthias Schnürer1, Thomas Sokollik1, Rainer Hörlein2, Daniel Kiefer2, Xueqing Yan2,3, Toshiki Tajima2,4, Peter Nickles1, Wolfgang Sandner1, and Dietrich Habs2 — 1Max Born Institut, Max Born Str. 2a, D-12489 Berlin, Germany — 2Max-Planck-Institut fuer Quantenoptik, D-85748 Garching, Germany — 3State Key Lab of Nuclear Physics and Technology, Beijing University, 100871, Beijing, China — 4Photomedical Research Center, JAEA. Kyoto, Japan
Experiments on ion acceleration from ultra-thin diamond-like carbon (DLC) foils with thicknesses below the skin depth (i.e. transparent), irradiated by ultra-high contrast laser pulses are presented. A maximum energy of 13 MeV for protons and 71 MeV for carbon ions is observed with an overall energy conversion efficiency Of ∼ 10 %. The increase in ion energies can be attributed to a dominantly collective rather than thermal motion of the foil electrons leading to an observed reduction in electron heating and in case of circular polarization to a pronounced peak in the C6+ spectrum. Two-dimensional particle-in-cell (PIC) simulations reveal that those C6+ ions are for the first time dominantly accelerated by the laser radiation pressure.