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P: Fachverband Plasmaphysik
P 16: Schwerionen- und lasererzeugte Plasmen I
P 16.9: Talk
Thursday, March 13, 2008, 18:30–18:45, 3D
Electron Acceleration in the Bubble Regime with a multi TW sub-10fs OPCPA System — •Karl Schmid1,2, Franz Tavella1, Laszlo Veisz1, Sofia Benavides1, Raphael Tautz1, Ullrich Schramm4, Bernhard Hidding6, Andrius Marcinkevicius3, Michael Geissler5, Jürgen Meyer-ter-Vehn1, Dietrich Habs2, and Ferenc Krausz1 — 1Max-Planck-Institut fuer Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany — 2Department für Physik der LMU München, Am Coulombwall 1, 85748 Garching, Germany — 3IMRA America Inc., 1044 Woodridge Avenue, Ann Arbor, Michigan 48105, USA — 4Forschungszentrum Dresden-Rossendorf e. V., Bautzner Landstraße 128, 01328 Dresden, Germany — 5Queen's University Belfast, Belfast BT7 1NN (UK) — 6Heinrich-Heine-Universitaet Duesseldorf, Universitaetsstrasse 1, 40225 Duesseldorf, Germany
We present the first experimental realization of a relativistic laser-plasma electron accelerator that is able to directly access the so-called bubble regime. In contrast to earlier experiments the ultrashort laser pulses applied in this experiment provide 50 mJ on target at pulse durations of 8.5 fs. These pulses, generated by a novel ultra broadband non-collinear OPCPA, allow us to operate in the bubble regime without relying on self modulation of the laser pulse in the plasma, producing electron energies of up to 35 MeV. We present first experimental evidence of more stable operation of the electron acceleration process and of improved efficiency due to less background of low energy electrons in the electron beam.