Berlin 2014 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 12: Poster Session - Magnetic Confinement
P 12.2: Poster
Dienstag, 18. März 2014, 16:30–18:30, SPA Foyer
Expansion Morphology of Magnetic Flux Tubes in the FlareLab Experiment — •Jan Tenfelde1, Felix Mackel1, Sascha Ridder1, Thomas Tacke2, Jürgen Dreher2, and Henning Soltwisch1 — 1Institut für Experimentalphysik V, Ruhr-Universität Bochum — 2Institut für theoretische Physik I, Ruhr-Universität Bochum
In the frame of the FlareLab project the influence of the experimental boundary conditions on the expansion of arch-shaped plasma-filled magnetic flux tubes is investigated. Observations show that contrary to common assumptions the expansion is not driven exclusively by the magnetic stresses causing the hoop force. Instead, geometric constraints due to fixation of the current path on a comparatively small electrode surface lead to a deviation from this hoop force expansion scheme. Recently it was shown by means of numerical simulations that electrostatic boundary effects can play a significant role in the expansion of its apex when the flux tube geometry deviates from a toroidal shape due to tied foot points [1]. Here, we present experimental data confirming the deviation from torus expansion and substantiate the results obtained from simulations. The impact of the initial neutral gas distribution on the morphology of the flux tube expansion is investigated in a further modified plasma source. From careful comparison with the results of numerical MHD simulations adapted to this modification, conclusions concerning the impact of the proposed boundary-driven expansion are drawn.
[1] T. Tacke, J. Dreher and R.D. Sydora, PoP, 20, 072104 (2013)