在电子束产生过程中，屏蔽半径应尽可能地小，且击穿延时时间较短，故选择石墨作为阴极材料。
Because of its small screening radius and short delay time, graphite is chosen as the cathode material.
实验过程中发现，推力器过热致使通道壁面变红，羽流颜色变成紫红色、阴极过热失效、阳极击穿等恶劣现象，甚至导致推力器熄火。
It is founded, in experiments, that thruster overheated make channel wall in red, plume into the color purple, cathode overheating failure, anode breakdown, and etc, even leading to thruster flameout.
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