Stuttgart 2012 – scientific programme

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P: Fachverband Plasmaphysik

P 20: Poster: Diagnostik

P 20.9: Poster

Thursday, March 15, 2012, 16:30–19:00, Poster.III

Advanced diagnostics for the FlareLab experiment — •Felix Mackel¹, Sascha Ridder¹, Thomas Tacke¹, Philipp Kempkes², Jan Tenfelde¹, and Henning Soltwisch¹ — ¹Ruhr-Universität Bochum, 44780 Bochum — ²MPI für Plasmaphysik, 17491 Greifswald

The FlareLab experiment is a pulsed power discharge that produces plasma filled arch-shaped magnetic flux tubes evolving on a microsecond timescale. An ionisation gauge has been developed to investigate the distribution of neutral gas density before gas breakdown. The results are compared to numerical simulations with a fluid dynamical model and are related to photographs of the ignition of the discharge. A CO₂ laser interferometer setup has been modified to extend the accessible space for measurements. The evolution of the line integrated electron density in the apex of the flux tube is studied for several experimental parameters. Simultaneously, the current density has been measured by a small Rogowski coil in close vicinity to the interferometer beam. There is a spatial correlation of electron and current density. As the measured plasma density is of the same order of magnitude compared to the neutral gas density, the degree of ionisation is expected to be high.