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P: Fachverband Plasmaphysik

P 10: Poster: Plasmadiagnostik

P 10.3: Poster

Wednesday, February 27, 2013, 16:30–18:30, Poster EG

Diagnostics for rapidly moving plasma loops — •Felix Mackel¹, Sascha Ridder¹, Jan Tenfelde¹, Philipp Kempkes², and Henning Soltwisch¹ — ¹Ruhr-Universität Bochum — ²MPI for Plasma Physics, EURATOM Association, Greifswald

The FlareLab experiment is a pulsed power discharge that produces plasma filled arch-shaped magnetic flux tubes evolving on a microsecond timescale. To determine the electron density of the moving arch, a set-up for optical emission spectroscopy with lines-of-sight at different arch positions was installed. The spectroscopic measurements were complemented by a CO₂ laser interferometer, measuring the line-integrated electron density in the flux tube’s apex at different loop expansions. Measurements with invasive Rogowski coils revealed a considerable discrepancy of the current flowing through the luminous arched structure and the capacitor current. Due to the missing current, coils of various diameter were utilised at different positions in the electrode system’s vicinity. Recently, a photodiode has been installed to investigate the generation of vacuum UV radiation and soft X-rays by fast particles. First preliminary results are shown which appear to correlate with flux tube features observed with a fast camera.