分别讨论了聚焦极电位、聚焦极孔径以及栅极电位对发射电子束的影响。
Influence of focus electrode bias, focus hole size and grid electrode bias on the emission electron beams was discussed.
等离子体的电位梯度跨越栅极，热灯丝将从等子体中抽取的离子超向灯丝。
The plasma potential gradient across the grid and the hot-filament draws ions from the plasma towards the filaments.
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