Bremen 2017 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 23: Low Temperature Plasmas

P 23.2: Poster

Mittwoch, 15. März 2017, 16:30–18:30, HS Foyer

Guide field magnetic reconnection on electron and ion scales — •Adrian von Stechow, Dusan Milojevic, Ilya Shesterikov, Olaf Grulke, and Thomas Klinger — Max-Planck-Institut für Plasmaphysik, Greifswald

Magnetic reconnection is a generic plasma process characterized by the release of accumulated magnetic energy due to rapid changes in magnetic topology. A central feature of reconnection is the formation of a highly localized current sheet on length scales much smaller than those of the externally imposed magnetic field. The detailed properties of this sheet determine the rate at which reconnection proceeds, and the appropriate model description depends crucially on the ordering of plasma length and time scales with respect to those of the current sheet.

VINETA.II is a linear, moderate to high guide field laboratory reconnection experiment that has previously operated in a regime in which ion dynamics play a minor role (f>fci) and for which an electron-MHD model is appropriate. Recent upgrades significantly extend this parameter space into an Alfvénic regime by increasing the time scales at which reconnection is driven and by broadening the current sheet through improved plasma sources. This contribution characterizes the transition between these regimes by interpreting key current sheet parameters such as magnetic flux transfer, current and plasma densities as well as wave propagation velocities.

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