Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 21: Laser Plasmas - Poster
P 21.7: Poster
Mittwoch, 7. März 2018, 16:15–18:15, Zelt West
Ion acceleration from gaseous targets — Anna-Marie Schroer1, Rajendra Prasad1, Bastian Aurand1, Stephanie Brauckmann1, Mirela Cerchez1, Oswald Willi1, •Tatyana Liseykina2, and Andrea Macchi3 — 1Heinrich-Heine-Universität Düsseldorf, Institut für Laser- und Plasmaphysik, Germany — 2Universität Rostok, Institut für Physik, Germany — 3CNR/INO, Adriano Gozzini laboratory, Pisa, Italy
In the experimental campaign at the ARCTRUS laser facility (University of Düsseldorf) we have studied ion acceleration from gaseous targets irradiated by intense laser beams. By changing experimental parameters we realized different acceleration regimes and studied transitions between acceleration mechanisms. In our experiments two ultra-short (∼30 fs) laser beams were focused perpendicular to each other on a H2 or He gas jet of a density 3· 10−5−1.3· 10−3g/cm3. The Heater laser beam was focused to the intensity of 2.4·1019W/cm2 by an f/10 off-axis parabola (OAP) or to 6.6·1017W/cm2 by an f/25 OAP. The Driver beam reached an intensity of 1.5·1020W/cm2 focused by an f/2 OAP. Two Thomson parabola spectrometers aligned in the direction transverse to the Heater beam were used for diagnostics. Additionally, the laser plasma interaction region was examined by optical and charge particle probing. We detected protons and Helium ions accelerated up to 400 keV in a single or a double beam interaction. We identified the range of the gas density and the laser beam parameters where the monoenergetic features in the ion spectra are observed. Our experimental results were validated by numerical simulations.