Bonn 2010 – wissenschaftliches Programm
HK 38.6: Vortrag
Mittwoch, 17. März 2010, 15:20–15:35, HG ÜR 8
Nuclear based diagnostics in high-power laser applications — •Marc Günther1, Kerstin Sonnabend1, Karsten Vogt2, Vincent Bagnoud2, Knut Harres1, Anke Otten1, and Markus Roth1 — 1TU Darmstadt, Institut für Kernphysik, Darmstadt, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany
High-power lasers allow focused intensities of >1018 W/cm2. During the laser-solid interaction, an intense relativistic electron current is injected from the plasma into the target. One challenge is to characterize the electron dynamic close to the interaction region. Moreover, next generation high-power laser proton acceleration leads to high proton fluxes, which require novel, nuclear diagnostic techniques. We present an activation-based nuclear pyrometry for the investigation of electrons generated in relativistic laser-solid interactions. We use novel activation targets consisting of several isotopes with different photo-neutron disintegration thresholds. The electrons are decelerated inside the target via bremsstrahlung processes. The high-energy bremsstrahlung induces photo-nuclear reactions. In this energy range no disturbing low energy effects are important. Via the pyrometry the Reconstruction of the absolute yield, spectral and spatial distribution of the electrons is possible. For the characterization of proton beams we present a nuclear activation imaging spectroscopy (NAIS). The diagnostic is based on proton-neutron disintegration reactions of copper stacked in consequtive layers. An autoradiography of copper layers leads to spectrally and spatialy reconstruction of the beam profile.