Studies of the deformable effects on the feedback stabilization of axisymmetric modes in tokamak plasmas
A new linear MHD stability code, NOVA-W, is described and applied to the study of the feedback stabilisation of the axisymmetric mode in deformable tokamak plasmas. It is a modification of the non-variational MHD stability code NOVA, which includes the effects of resistive passive conductors and active feedback circuits. The NOVA-W code is used to examine the effects of plasma deformability on feedback stabilisation. It is seen that plasmas with strongly shaped cross-sections have unstable motion different from a rigid shift. Furthermore, the placement of passive conductors is shown to modify the non-rigid components of the motion in a way that reduces the stabilising effects of these conductors. Passive feedback results using several equilibria, including the CIT design equilibrium, are presented. The NOVA-W code is presently being adapted for the highly shaped TCV design equilibrium. Initial results for the TCV configuration are also presented.
Bibliographic Reference: Article: 1991 International Sherwood Fusion Conference (1991) p. 3C22
Record Number: 199111323 / Last updated on: 1994-12-02
Original language: en
Available languages: en