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SYPA: Energetic Particle Acceleration in Space and Laboratory

SYPA 1: Particle Acceleration

SYPA 1.4: Vortrag

Mittwoch, 1. April 2009, 18:30–18:45, Zahnklinik

Hot tail runaway electron mechanism — •Hakan Smith — Max-Planck-Institut für Sonnensystemforschung, Katlenburg-Lindau, Deutschland

Hot tail runaway electron generation is caused by incomplete thermalization of the electron velocity distribution during rapid plasma cooling. It is an important runaway electron mechanism in tokamak disruptions when the thermal quench phase is sufficiently fast. Analytical estimates of the density of produced runaway electrons will be presented for cases of exponential-like temperature decay. Numerical simulations, aided by the analytical results, will be used to compare the strength of the hot tail runaway generation with the Dreicer mechanism for different disruption parameters. It is seen that the hot tail runaway production is going to be the dominant of these two primary runaway mechanisms in ITER.