Berlin 2014 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 13: Poster Session - Diagnostics

P 13.9: Poster

Dienstag, 18. März 2014, 16:30–18:30, SPA Foyer

Short time-scale diagnostics for a rapidly moving arch-shaped plasma — •Sascha Ridder, Felix Mackel, Jan Tenfelde, and Henning Soltwisch — Ruhr-Universität Bochum

The FlareLab experiment is a pulsed power discharge studying the dynamical behaviour of plasma-filled arch-shaped flux tubes. In the experiment the arch-shaped flux tubes evolve on a microsecond time-scale. To determine the line-integrated electron density of the moving arch a CO₂ laser interferometer was installed. The Michelson interferometer is operated with a moveable probing arm under various experimental conditions. Measurements with invasive Rogowski coils revealed a considerable discrepancy of the current flowing through the luminous arched structure and the current provided by the pulsed power supply. Due to the missing current, coils of various diameter were utilised at different positions in the electrode system’s vicinity and in the arch. Also an array of Ḃ-probes was installed around the footpoints of the arch to investigate the dynamics of plasma instabilities, being observed earlier by fast iCCD cameras. Additionally, spatially resolved measurements with a photodiode with its line-of-sight onto the electrode system were conducted. The photodiode was operated with various metal foils as energy filters to investigate the generation of vacuum UV radiation and soft X-rays.