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VDE Characteristics during Disruption Process and its Underlying Acceleration Mechanism in the ITER-EDA Tokamak

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  • VDE Characteristics during Disruption P

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Abstract

The dynamic behavior of vertical displacement events (VDEs) during a disruption and acceleration mechanisms that govern VDEs in the ITER-EDA tokamak are investigated using the Tokamak Simulation Code. A sudden. plasma pressure drop (β_p collapse) does not accelerate VDEs for the ITER tokamak. The geometry of the ITER resistive shell is shown to be suitable for preventing a β_p collapseinduced VDE, because the magnetic field decay n-index after the β_p collapse does not considerably degrade. On the other hand, it is shown that the plasma current quench (I_p quench) following the energy quench can accelerate VDEs due to the vertical imbalance of the attractive force arising from the up-down asymmetric shell. The vertical location of the neutral point where the I_p quench-induced VDE almost disappears is found to lie at ~ 22 cm below the plasma magnetic axis of the nominal equilibrium (Z = 1.44 m). An upward and moderate I_p quench-induced VDE can be expected for the nominal configuration in the ITER-EDA tokamak. It is shown that the ITER tokamak has an advantage of avoiding the fatal damage of the complicated structures of the bottom-divertor.

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