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P: Fachverband Plasmaphysik

P 14: Miscellaneous

P 14.2: Vortrag

Mittwoch, 10. März 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 Yan^2,3, Toshiki Tajima^2,4, 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.