Stuttgart 2012 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 22: Poster: Sonstiges
P 22.5: Poster
Donnerstag, 15. März 2012, 16:30–19:00, Poster.III
Numerical Investigation on Complex Target Geometries in the Context of Laser-Acclerated Proton Beams — •O. Deppert1, K. Harres1, S. Busold1, G. Schaumann1, C. Brabetz2, M. Schollmeier3, M. Geissel3, V. Bagnoud4, D. Neely5, P. McKenna6, and M. Roth1 — 1IKP, Technische Universität Darmstadt — 2IAP, Goethe Universität Frankfurt — 3Sandia National Laboratories, NM, USA — 4GSI - Helmholtzzentrum für Schwerionenforschung, Darmstadt — 5Rutherford Appleton Laboratory, UK — 6University of Strathclyde, UK
The irradiation of thin metal foils by an ultra-intense laser pulse leads to the generation of a highly laminar, intense proton beam accelerated from the target rear side by a mechanism called TNSA. This acceleration mechanism strongly depends on the geometry of the target. The acceleration originates from the formation of a Gaussian-like electron sheath leading to an electric field in the order of TV/m. This sheath field-ionizes the target rear side and is able to accelerate protons from a hydrogen contamination layer. The Gaussian-like sheath adds an energy dependent divergence to the spatial proton beam profile. For future applications it is essential to reduce the divergence already from the source of the acceleration process. Therefore different target geometries were studied numerically with the help of Particle-In-Cell (PIC) simualtions. Both, the influence of the target geometry as well as the influence of the laser beam profile onto the proton trajectories will be discussed. Furthermore, the first experimental results of a dedicated target geometry for laser-ion acceleration will be presented.