Calculation of 3D magnetic fields produced by MHD active control systems in fusion devices

摘要

In a magnetic confinement fusion device the presence of a conductive shell surrounding the plasma is important to guarantee a good MHD stability; however, a feedback control system of the plasma instabilities is also required. Recently, a very effective control scheme, named Clean Mode Control (CMC), has been proposed in RFX-mod. The CMC is based on the real-time correction (cleaning), under ideal shell hypothesis, of the sideband harmonics in the magnetic field produced by the discrete local active coils. In this paper we describe how to exploit periodic boundary conditions in the frequency domain calculations of 3D magnetic fields produced by MHD active control systems, in view of a possible development of the CMC algorithm for more realistic shell geometry.