Simulations of the runaway electron distributions

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Abstract
The time evolution of the electron distribution function is followed from an initial Maxwellian to the quasi‐steady‐state runaway distribution as a function of E/ED and Z using a new two‐dimensional Fokker–Planck code. The electron distributions are used to determine the runaway production rate, the current density along with the fraction of Ohmic power directed to the runaways, and the perpendicular and parallel temperatures of the high energy distributions. A simple parameterization of the high energy distribution is given and used to investigate the high frequency runaway instability for the infinite uniform plasma.