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.
Feedback
Fusion Device
Resistive Wall Mode
Author
Yueqiang Liu
Chalmers, Department of Electromagnetics, Computational Electromagnetics
Anders Bondeson
Chalmers, Department of Electromagnetics, Computational Electromagnetics
D. Gregoratto
Chalmers
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) 1741-4326 (eISSN)
Vol. 44 1 77-86Subject Categories
Physical Sciences
DOI
10.1088/0029-5515/44/1/009