Hannover 2016 – scientific programme

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P: Fachverband Plasmaphysik

P 20: Poster Session- Low Temperature Plasmas

P 20.10: Poster

Wednesday, March 2, 2016, 16:30–19:00, Empore Lichthof

Measurements of Plasma Properties Using Fast Sweeping Langmuir Probe in VINETA-II magnetic reconnection experiment — •Ilya Shesterikov¹, Olaf Grulke¹, Reiner Stenzel² und Thomas Klinger^1,3 — ¹Max Planck Institute for Plasma Physics, 17491 Greifswald, Germany — ²Department of Physics and Astronomy, University of California, Los Angeles, CA 90095-1547 — ³Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, Felix-Hausdorff-Straße 6, D-17489 Greifswald

A novel, fast-sweep Langmuir probe has been constructed and successfully operated at VINETA-II magnetic reconnection experiment. This work presents the time-dependent measurements of VINETA-II plasma. The probe is biased by means of a time-dependent sinusoidal voltage signal with a fixed frequency. Current * voltage characteristics are measured along the falling and rising slopes of the applied signal. Probe permits sweep frequency up to 400 kHz. The circuit response has been tested by measuring the known current - voltage characteristics of resistors. The axial plasma current in VINETA is driven by plasma gun pulsed with the time scale of 60 µ s. Probe results present the first time dependent measurement of n_e, T_e, and φ_fl of the gun discharge plasma with and without magnetic reconnection. The n_e measurements agree favorably with those derived from interferometer measurements.