Dynamical modelling of neoclassical tearing mode suppression by ECCD
FOM Institute DIFFER – Dutch Institute for Fundamental Energy Research, Association EURATOM-FOM, Trilateral Euregio Cluster, PO Box 1207, 3430 BE Nieuwegein, The Netherlands
a e-mail: B.Ayten@differ.nl
The rotation of a magnetic island through the EC power deposition region in combination with a finite collisional time scale on which the EC power is converted into current are shown to affect the NTM stabilization by ECCD. In particular, the stabilizing term from localized ECCD in the generalized Rutherford equation oscillates at the island rotation frequency. As a consequence, also the island width oscillates at the rotation frequency. When the rotation frequency is reduced, these oscillations increase in amplitude and result in a net increase of the time averaged stabilizing effect of ECCD.
© Owned by the authors, published by EDP Sciences 2012