Abstract
We propose a framework to extend the magnetohydrodynamic (MHD) equa- tions to include electron cyclotron current drive (ECCD) and discuss previous models proposed by Giruzzi et al.(2) and by Hegna and Callen(3). To model neoclassical tear- ing mode (NTM) instabilities and study the growth of magnetic islands as NTMs evolve, we employ the nonlinear reduced-MHD simulation JOREK. We present tearing-mode growth-rate calculations from JOREK simulations.
Highlights
We propose a framework to extend the magnetohydrodynamic (MHD) equations to include electron cyclotron current drive (ECCD) and discuss previous models proposed by Giruzzi et al.[2] and by Hegna and Callen[3]
Neoclassical tearing modes (NTMs) are one of the major MHD instabilities limiting the performance of tokamak fusion reactors
The localized current drive provided by electron cyclotron current drive (ECCD) can be used to control or suppress NTMs
Summary
Neoclassical tearing modes (NTMs) are one of the major MHD instabilities limiting the performance of tokamak fusion reactors. The localized current drive provided by electron cyclotron current drive (ECCD) can be used to control or suppress NTMs. The growth of an NTM is currently modelled theoretically by the generalized Rutherford equation (GRE). Theoretical and numerical works have noted deficiencies in the GRE, concerning the size at which a NTM saturates [8][9][13]. In this work we describe our progress toward designing a 3D reduced-MHD simulation of tearing mode suppression by ECCD. We first discuss extension of the reduced-MHD equations to incorporate the effect of ECCD. We describe the main features of the 3D nonlinear MHD code JOREK and show early results from simulations of tearing modes that establish the suitability of the code
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