Bochum 2015 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 15: Poster Session - Magnetic Confinement
P 15.9: Poster
Dienstag, 3. März 2015, 16:30–18:30, Foyer Audimax
Blob dynamics simulations for the TJ-K plasma — •Allah Rakha1, Stephen Garland1, Mirko Ramisch1, and Bruce Scott2 — 1Institut für Grenzflächenverfahrenstechnik und Plasmatechnologie, Universität Stuttgart, Germany — 2Max-Planck-Institut für Plasmaphysik, Euratom Association, D-85748 Garching, Germany
Radially propagating filaments elongated along magnetic field lines, known as blobs, are responsible for a major part of particle density and energy cross-field transport in the scrape-off layer (SOL) of fusion devices. Blobs, which are born in the vicinity of the last closed flux surface, are denser and hotter than the background SOL plasma, and can cause damage to plasma facing components. A good understanding of their trajectories is therefore important for the design of future fusion reactors.
As the dynamics of blobs in the SOL is governed by nonlinear phenomena, and analytical models are insufficient for their detailed study, nonlinear simulations are necessary to gain a better understanding. First simulations of plasmas with TJ-K equivalent parameters have been carried out using the GEMR gyrofluid code (an energy conserving electromagnetic six field gyrofluid model with radially dependent geometry). The simulation results are compared with experimental data from the TJ-K Stellarator in order to improve the understanding of SOL transport.