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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Beschleuniger II

HK 45.3: Vortrag

Mittwoch, 23. März 2011, 17:15–17:30, A-1

Enhanced laser ion acceleration from mass-limited foils — Thomas Kluge¹, Wolfgang Enghardt², Stephan D. Kraft¹, Karl Zeil¹, Thomas E. Cowan¹, and •Michael Bussmann¹ — ¹Forschungszentrum Dresden-Rossendorf (FZD), 01328 Dresden, Germany — ²OncoRay, Technische Universität Dresden, D-01307 Dresden, Germany

We have performed an analysis of ultra-intense laser interaction with solid mass-limited targets (MLT) via electrodynamic 2D3V particle-in-cell simulations. The interaction with long (300 fs) high intensity (10²⁰ W/cm²) laser pulses with targets of diameter down to 1 micron is described in detail with respect to electron dynamics and proton and ion acceleration. Depending on the foil diameter, different effects consecutively arise. Electrons laterally recirculate within the target, smoothening the target rear accelerating sheath and increasing the hot electron density and temperature. We developed an analytical model which enables us to predict the electron energy distribution of an MLT. Our results suggest that the most significant ion energy enhancement should be expected for MLT with diameter below the laser focal spot size. The spread of energetic protons is decreased for medium sized foils while it is greatly increased for foils of size near the focal spot size.