Bonn 2010 – wissenschaftliches Programm
HK 11.4: Vortrag
Montag, 15. März 2010, 17:30–17:45, HG ÜR 8
Capture and Control of Laser-Accelerated Proton Beams — •Knut Harres, Frank Nürnberg, Oliver Deppert, Simon Busold, and Markus Roth — Institut für Kernphysik, Technische Universität Darmstadt, Germany
An intense research is being conducted on sources of laser-accelerated ions and their applications. Proton beams accelerated from planar targets by intense, short laser pulses have exceptional properties, such as high brightness, directionality and laminarity as well as short duration. But for further applications, the energy dependent envelope-divergence (up to 50°) and the exponential energy distribution are the major drawbacks. During experimental campaigns at the Phelix laser system, the capture of laser-accelerated proton beams via a solenoid field has been studied supported by Warp particle-in-cell simulations. It was observed that the influence of the co-moving electrons is of vital importance. The magnetic effect on the electrons outbalances the space-charge force and hence back up the collimation of the protons. The final goal is to develop, on basis of these first capture experiments and simulations, a test stand at the GSI Helmholtzzentrum für Schwerionenforschung (Darmstadt, Germany), which offers both the Phelix laser system and the accelerator expertise.