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Disruption Modelling
A series of 2D (TSC) and 3D (M3D) simulations have been carried out for pellet injection scenarios in tokamaks and for runaway generation during disruptions in high-current discharges. THe 3D pellet simulations showed the importance of MHD forces in the mass-distribution of an injected pellet, while the 2D simulation was able to incorporate this effect in a "back-averaged" model which reproduced the experimental results and included a detailed transport and radiation model. For runaway generations:
(i) the 3D model was used to demonstrate the effects of 3D MHD instabilities in defeating the avalanche process if the instability amplitude is sufficiently large; and
(ii) the 2D model was used to demonstrate that runaways could be avoided completely if the disruption is induced by a sequence of impurity-doped "killer pellets" and if the poloidal field coils are ramped down simultaneously with the pellet injection.
Both of these codes are made predictions of induced halo currents in the conducting structure.
Email Wonchull Park or Stephen Jardin for more informatoin on Disruption Modeling.
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