Bremen 2017 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 10: Theory and Modeling I

P 10.1: Hauptvortrag

Dienstag, 14. März 2017, 14:00–14:30, HS 2010

Filamentary plasma eruptions: results from the nonlinear ballooning model — •Sophia A. Henneberg1, Steven C. Cowley2,3, and Howard R. Wilson41Max-Planck-Institut für Plasmaphysik, Wendelsteinstr. 1, 17489 Greifswald — 2Rudolf Peierls Centre for Theoretical Physics, University of Oxford, Oxford OX1 3NP, UK — 3Corpus Christi College, Oxford OX1 4JF, UK — 4York Plasma Institute, University of York, Heslington, YO10 5DD, UK

Two distinct studies are investigated exploiting the nonlinear model for ideal ballooning modes with potential applications to Edge Localized Modes (ELMs). The nonlinear model for tokamak geometries was developed by Wilson & Cowley 2004 and consists of two differential equations which characterize the temporal and spatial evolution of the plasma displacement.

In the first study, the interaction of multiple filamentary eruptions is addressed in magnetized plasma in a slab geometry. Equally sized filaments evolve independently in both the linear and nonlinear regime. However, if filaments are initiated with slightly different heights from the reference flux surface, they interact with each other in the nonlinear regime: Lower filaments are slowed down and then completely suppressed while the higher filaments grow faster due to the nonlinear interaction.

In the second study, this model of nonlinear ballooning modes is examined quantitatively against experimental observations of ELMs in MAST and JET-like geometries. The results suggest experimentally relevant results can only be obtained using modified equilibria.

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