Düsseldorf 2007 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 22: Poster

P 22.6: Poster

Donnerstag, 22. März 2007, 16:30–18:30, Poster A

Time-resolved proton probing of laser-induced front and rear side plasma expansion phenomena — •Munib Amin¹, Marco Borghesi², Carlo Cecchetti², Julien Fuchs³, Mikhail Kalashnikov⁴, Peter Viktor Nickles⁴, Ariane Pipahl¹, Gerd Priebe⁵, Enrico Risse⁴, Wolfgang Sandner^4,6, Matthias Schnürer⁴, Thomas Sokollik⁴, Sargis Ter-Avetisyan⁴, Toma Toncian¹, Puthenparampil Wilson², and Oswald Willi¹ — ¹Heinrich-Heine-Universität, 40225 Düsseldorf, Germany — ²School of Mathematics and Physics, The Queen's University, Belfast BT7 1NN, UK — ³Laboratoire pour l'Utilisation des Lasers Intenses, 91128 Palaiseau, France — ⁴Max-Born-Institut, Max-Born-Str. 2a, 12489 Berlin, Germany — ⁵CCLRC Daresbury Laboratory, Warrington, Cheshire, WA4 4AD, UK — ⁶Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany

Plasma expansion on targets irradiated by a short pulse high power laser has been the subject of many recent investigations. However, a special phenomenon that can be observed on the surface of laser-irradiated metal foils has gained only little attention yet. It covers an area of several square millimetres and is accompanied by strong transient electric fields (up to ca. 10^10 V/m) that are able to displace high energetic protons on a picosecond time scale. In our experiments we used slightly bent foils and metal foil cylinders of a small diameter (ca. 800 microns) as targets. Laser accelerated protons were used to probe the spatial and temporal evolution of the electric fields on the surface. The time-dependent electric field distribution was modelled by a particle tracing program. A variation of the simulation field parameters allowed for a fit to the experimental data.