Measurements of Secondary Electron Emission Effects in the Hall Thruster Discharge

[摘要] The dependence of the maximum electron temperature on the discharge voltage is studied for two Hall thruster configurations, in which a collisionless plasma is bounded by channel walls made of materials with different secondary electron emission (SEE) properties. The linear growth of the temperature with the discharge voltage, observed in the channel with a low SEE yield, suggests that SEE is responsible for the electron temperature saturation in the thruster configuration with the channel walls having a higher SEE yield. The fact that the values of the electron temperature at saturation are rather high may indirectly support the recently predicted kinetic regime of the space charge saturation of the near-wall sheath in the thruster discharge. A correlation between the effects of the channel wall material on the electron temperature and the electron cross-field current was also observed.

[发布日期] 2005-12-01 [发布机构] Princeton University. Plasma Physics Laboratory.

[关键词] Saturation;Plasma Magnetohydrodynamics, Discharges (Electric), Plasma Temperature, Plasma Boundary Layers, Plasma-Wall Interactions, Space Charge, Plasma Sheaths, Plasma Transport Processes;Thrusters Plasma Magnetohydrodynamics, Discharges (Electric), Plasma Temperature, Plasma Boundary Layers, Plasma-Wall Interactions, Space Charge, Plasma Sheaths, Plasma Transport Processes;70 Plasma Physics And Fusion Technology;Space Charge