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P: Fachverband Plasmaphysik

P 12: Magnetic Confinement - Poster

P 12.3: Poster

Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal

Langmuir probe diagnostic at the Vineta II magnetic reconnection experiment — •Tiziano Fulceri, Adrian Von Stechow, and Olaf Grulke — Max Planck Institut für Plasmaphysik, 17489 Greifswald, Wendelsteinstrasse 1, Deutschland

Vineta II is an experiment to investigate magnetic reconnection in a controlled laboratory environment. In its current setup, reproducible magnetic reconnection is driven on a timescale of the order of  10 µs and the reconnection current sheet and magnetic topology is reconstructed using postionable probes. Central reconnection current sheet properties, such as the time evolution of electron temperature and density as well as electrostatic fields, are measured by a fast swept Langmuir probe. It is biased with an oscillating +/-200V voltage at an adjustable frequency from 50kHz to 200kHz, which allows to record the full probe characteristics on the reconnection timescale. Key parameters are the gradients of electron density and temperature, which contribute significantly to the radial force-balance of the reconnection current sheet. This contribution describes the development of the probe’s experimental setup, especially with regards to high frequency circuit optimization (pickup rejection, low inductances), and presents initial measurements results.