Bochum 2015 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 20: Laser Plasmas I

P 20.4: Vortrag

Mittwoch, 4. März 2015, 15:00–15:15, HZO 30

First results of laser-proton acceleration with cryogenic hydrogen targets at the POLARIS laser — •Georg Alexander Becker¹, Jens Polz¹, Anton Kalinin³, Alexander Robinson⁴, Diethard Klöpfel¹, Wolfgang Ziegler¹, Rui Costa Fraga³, Sebastian Keppler¹, Hartmut Liebetrau¹, Alexander Kessler², Frank Schorcht², Marco Hellwing¹, Marco Hornung², Robert Grisenti³, and Malte Christoph Kaluza^{1, 2} — ¹Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, 07743 Jena, Germany — ²Helmholtz Institut Jena, 07743 Jena, Germany — ³Institut für Kernphysik, Goethe-Universität, 60438 Frankfurt am Main, Germany — ⁴Central Laser Facility, Rutherford-Appleton Laboratory, Chilton, Oxon., OX11 0QX, UK

For the first time on the POLARIS laser system, a laser-driven proton acceleration experiment with cryogenic hydrogen droplets and filaments has been performed. Most laser-driven proton acceleration experiments use target materials including metals, plastics or diamond-like carbon. Due to the multitude of ion species accelerated from such targets, understanding the acceleration processes becomes quite complicated. The use of liquid or frozen hydrogen targets reduces the accelerated species to protons only and additionally produces, due to the mass limited droplets or filaments, a higher acceleration field. The experimental setup and results, including isolated monoenergetic peaks in the high energy range of the proton spectra, will be discussed.