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P: Plasmaphysik

P 14: Schwerionen- und lasererzeugte Plasmen 1

P 14.2: Vortrag

Dienstag, 28. März 2006, 15:00–15:15, 1004

Generation of Quasi-monoenergetic Electron Bunches with 80-fs Laser Pulses — •Bernhard Hidding¹, Kay-Uwe Amthor², Ben Liesfeld², Heinrich Schwoerer², Stefan Karsch³, Michael Geissler³, Laszlo Veisz³, Karl Schmid^3,4, Georg Pretzler¹, and Roland Sauerbrey² — ¹Institut für Laser- und Plasmaphysik, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany — ²Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena, 07743 Jena, Germany — ³Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — ⁴Department für Physik, Ludwig-Maximilians-Universität München, 85748 Garching, Germany

Highly collimated, quasi-monoenergetic multi-MeV electron bunches were generated by the interaction of tightly focused, 80-fs laser pulses with a high-pressure gas jet. These monoenergetic bunches are characteristic of wakefield acceleration in the highly nonlinear broken wave regime, which was previously thought to be accessible only by much shorter laser pulses in thinner plasmas. In our experiment, the initially long laser pulse was modified in under-dense plasma to match the necessary conditions. This picture is confirmed by semi-analytical scaling laws and 3D particle-in-cell (PIC) simulations. Our results show that laser-plasma-interaction can drive itself towards this type of laser wakefield acceleration even if the initial laser and plasma parameters are outside the required regime.