A one-dimensional slab model of the plasma sheath in the stationary plasma thruster(SPT)chamber is developed in this study.It is considered that secondary electrons emitted fromceramic walls are partially trapped by the bulk plasma in the SPT chamber;some secondaryelectrons drift across the sheath where they are generated and the bulk and move towards theopposite sheath.Thus both the secondary electron emission(SEE)from one sheath and thepartially trapped secondary electrons from the opposite sheath contribute to this sheath.Theresults indicate that both the SEE coefficient and trapping coefficient have a significant impactnot only on the distributions of both electrons and ions of the SPT sheath but also on the energyflux loss to the SPT wall.When the trapping coefficient increases,the energy flux of electronsdeposited to the walls will increase whereas that of ions will decrease.Besides,the critical electrontemperature will decrease greatly with the increase of the trapping coefficient.
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