ITER's planned 60-second current ramp-down is MHD-stable if the plasma starts sufficiently hot, but significantly faster ramps excite locking 2/1 tearing modes that trigger disruptions.
Smith,Numerical solution of partial differential equations: finite difference methods, (Oxford University Press, Oxford UK, 1965)
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A simple model of current ramp down in the ITER tokamak
ITER's planned 60-second current ramp-down is MHD-stable if the plasma starts sufficiently hot, but significantly faster ramps excite locking 2/1 tearing modes that trigger disruptions.