Abstract
A combined Monte Carlo simulation of secondary electron emission from solids and transport of secondary electrons in a plasma sheath in front of the surface is performed for analyzing a relationship between the secondary electron yield and sheath voltage formed on the wall in magnetic fusion devices. In spite of the sheath acceleration, due to an oblique magnetic field, the prompt return of secondary electrons appears within first gyration in the sheath and this causes a decrease in the secondary electron yield of the wall, and as a result, it suppresses the reduction of the sheath voltage due to the secondary electrons. The difference between the secondary electron yield of low- Z (Be, C) and high- Z (Mo, W) metals is suppressed as well due to the prompt return. The secondary electron yield and sheath voltage depend on the electron temperature and density in the plasma, magnetic field strength and inclination angle of magnetic field lines to the wall surface. Therefore, these dependences are calculated for the relevant ranges to edge plasmas in fusion devices.
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