A novel method to measure net secondary electron emission yield due to primary electron irradiation from a tokamak scrape-off layer plasma is described. High emission coefficients close to unity are obtained independent of the electron temperature. Enhanced elastic backscattering of low-energy primary electrons, already identified as an important phenomenon in many other fields of research, is likely to explain the high yields.
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J.P. Gunn (2012) studied this question.
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