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How the magnetic field becomes tangled to allow this, and where the heat goes, is not predictable.","posed_since":"","precise":"Identify what sets the thermal quench duration (about 1e-3 s or less in large tokamaks): magnetic stochastization by global MHD modes, radiative collapse, and parallel heat transport in stochastic fields. Predict the quench time, the radiated versus conducted energy fraction and the wall heat-load distribution for ITER. 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