In a magnetic confinement fusion device the presence of a conductive wall (shell) surrounding the plasma is important to guarantee a good magnetohydrodynamic (MHD) stability. However, due to the finite diffusion time of any resistive shell, 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) of the sideband harmonics in the magnetic field due to the discrete nature of the 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 possible optimization of the CMC scheme.
Calculation of 3D magnetic fields produced by MHD active control systems in fusion devices
BETTINI, PAOLO;
2013
Abstract
In a magnetic confinement fusion device the presence of a conductive wall (shell) surrounding the plasma is important to guarantee a good magnetohydrodynamic (MHD) stability. However, due to the finite diffusion time of any resistive shell, 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) of the sideband harmonics in the magnetic field due to the discrete nature of the 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 possible optimization of the CMC scheme.Pubblicazioni consigliate
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