Abstract
A Monte Carlo simulation model which calculates secondary electron emission from a beryllium surface is combined with an electron transport model in a sheath which is found at the interface between the surface and an edge plasma in magnetic confinement fusion devices. In the model, (1) secondary electron emission from the surface due to bombardment of Maxwellian plasma electrons decelerated by the sheath potential, (2) gyromotion of emitted secondary electrons in the sheath subjected to an oblique magnetic field and (3) their acceleration of the sheath electric field normal to the surface, are involved. Some of the secondary electrons return to the surface within their first gyration, resulting in a considerably low effective secondary electron yield.
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