Effect of 3D magnetic perturbations on the plasma rotation in ASDEX Upgrade
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The toroidal torque due to the non-resonant interaction with external magnetic perturbations (TF ripple and perturbations from ELM mitigation coils) in ASDEX Upgrade is modelled with help of the NEO-2 and SFINCS codes and compared to semi-analytical models. It is shown that almost all non-axisymmetric transport regimes contributing to neoclassical toroidal viscosity (NTV) are realized within a single discharge at different radial positions. The NTV torque is obtained to be roughly a quarter of the NBI torque. This indicates the presence of other important momentum sources. The role of these momentum sources and possible integral torque balance measurements are briefly discussed.
Martitsch, A. F., Kasilov, S. V., Kernbichler, W., Kapper, G., Albert, C. G., Heyn, M. F., ... the EUROfusion MST1 Team (2016). Effect of 3D magnetic perturbations on the plasma rotation in ASDEX Upgrade. Plasma physics and controlled fusion, 58(7), 074007. https://doi.org/10.1088/0741-3335/58/7/074007