Bochum 2015 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 20: Laser Plasmas I
P 20.2: Vortrag
Mittwoch, 4. März 2015, 14:30–14:45, HZO 30
Electric field development and ion dynamics at the magnetic cavity edge of laser produced plasma expansion — •Bo Ram Lee1, Anton Bondarenko2, Eric Clark2, Carmen Constantin2, Erik Everson2, Derek Schaeffer2, Christoph Niemann2, and Dieter H. H. Hoffmann1 — 1Technische Universität Darmstadt, Darmstadt, Germany — 2University of California, Los Angeles, Los Angeles, USA
The Raptor kJ class 1053 nm Nd:Glass laser in the Phoenix laser facility at University of California, Los Angeles (UCLA) in conjunction with the Large Plasma Device (LAPD), which creates a tenuous, uniform, and quiescent ambient magnetized plasma of peak plasma density of ni ∼ 1.0×1013cm−3 and the background magnetic field varying from 200G to 1400G, provides a very unique and space-alike plasma environment. Debris ions from a carbon or polyethylene target are accelerated with super-Alfvénic speed by laser irradiation, and coupled to the ambient ions, the magnetic field background is expelled. The interaction of the debris-ambient plasma and the magnetic field creates a diamagnetic cavity, which acts as a piston launching magnetized collisionless shocks in laboratory plasma reproducing collisionless shocks observed in space. In the recent experiment at UCLA, a heated Langmuir probe has been employed to measure the electric field. Radial electric field development as well as in azimuthal direction has been investigated and its correlation with the magnetic field and ion dynamics, especially at the cavity edge, is studied. The experimental results are compared to two-dimensional hybrid simulations.