Feedback Control of Resistive Wall Modes in Toroidal Devices
Journal article, 2004

Feedback control of nonaxisymmetric resistive wall modes is studied analytically for cylindrical plasmas and computationally for high beta tokamaks. Internal poloidal sensors give superior performance to radial sensors, for instance in terms of the highest achievable plasma pressure. A single poloidal array of feedback coils allows robust control with respect to variations in plasma pressure, current and rotation velocity. The control analysis is applied to advanced scenarios for ITER. Configurations with multiple poloidal coils and feedback systems for nonresonant MHD instabilities in reversed field pinches are also studied. The control study was carried out using the assumption of ideal amplifiers.


Fusion Device

Resistive Wall Mode


Yueqiang Liu

Chalmers, Department of Electromagnetics, Computational Electromagnetics

Anders Bondeson

Chalmers, Department of Electromagnetics, Computational Electromagnetics

D. Gregoratto


Carl-Magnus Fransson

Chalmers, Signals and Systems, Control and Automation Laboratory

Y. Gribov

Physics Unit

R. Paccagnella

Consorzio Rfx

Consiglo Nazionale Delle Richerche

Nuclear Fusion

0029-5515 (ISSN)

Vol. 44 1 77-

Subject Categories

Physical Sciences



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