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Plasma Physics (Physics/ECE/NE 922) Seminar
Ion-scale turbulence in the presence of a large magnetic island
Date: Monday, March 4th
Time: 12:05 pm
Place: 2241 Chamberlin Hall
Speaker: Lucas Morton, UW-Madison
Abstract: Understanding the effect of magnetic field geometry on turbulence is important for both tokamaks and stellarators. The introduction of a magnetic island to a toroidal plasma might influence turbulence in several ways: directly through geometric effects or indirectly through modifications to gradients that drive turbulence or flows that suppress turbulence. In an experiment on DIII-D tokamak, we studied the response of ion-gyro-radius scale density fluctuations using the Beam Emission Spectroscopy (BES) diagnostic. Our results confirm qualitative predictions of prior turbulence simulations, especially the reduction of turbulent fluctuations at the center of the island. This motivates dedicated simulations to understand the relative contribution of the various mechanisms by which magnetic geometry impacts turbulence in this situation.
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