Inclusion of 3D wall effects in MHD feedback control for RFP and tokamak plasmas

摘要

The wall of any magnetic fusion device is composed of various 3D structures, such as large portholes, gaps, coil feeds, and other features. These can affect plasma stability, inducing magnetic field errors, coupling different modes, or increasing their growth rate. These effects should thus be considered in any MHD feedback control approach. Examples of how the dynamic response of a 3D wall can be included in MHD feedback control are presented, both for reversed-field pinch (RFP) and tokamak experiments in RFX-mod and DIII-D.