Instabilities of ideal MHD mode and neoclassical tearing mode stabilization by electron cyclotron current drive for EHL-2 spherical torus
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Graphical Abstract
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Abstract
The next generation fusion device listed on ENN’s fusion roadmap, named as (ENN He-Long) EHL-2, is under both physics and engineering design. The instabilities of ideal magnetohydrodynamics (MHD) mode and neoclassical tearing mode (NTM) stabilization by electron cyclotron current drive (ECCD) for EHL-2’s two typical operation scenarios are analysed. For High-Ion-Temperature operating scenario, the vertical displacement event (VDE) could be a big challenge to the device safety. For the Steady-State Operating scenario, the limitation may rise from the ideal MHD mode, neoclassical tearing mode, etc. This suggests that the MHD analysis of both operation scenarios should be done with different focusing. Preliminary analysis based on the current physics and engineer design of both two scenarios are given in this work. Based on the analysis result of above, the future assessment might target at active control method and the effect of boron on MHD activities
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