Dependence of Electron Energy on Electron Stimulated Desorption Yield of Deuterium

Abstract

Dependence of electron energy on electron stimulated desorption (ESD) yield of deuterium was investigated for various plasma facing materials. Signal intensities of D₂ and HD were detected at higher electron energy than 400 eV and 200 eV, respectively. A maximum of ESD yield was observed at around 800 eV. The maximum yields of HD and D₂ were approximately 0.03 HD/electron and 0.02 D₂/electron for a ferritic steel (F82H). Desorption of atomic hydrogen due to ESD was also detected. The dependence of electron energy on the ESD yield was almost the same in all material.