But the ion extraction time does not always decrease with the applied voltage.
但是，离子引出时间并非一直随电压的增加线性减小。
Experimental study of the influence of plasma shielding on ion extraction time.
等离子体屏蔽效应对离子取出时间影响的实验研究。
The RF method shortens the ion extraction time, and increases the ion extraction efficiency. It can also control the plasma density by changing the magnetic field.
共振法缩短了离子引出时间，提高了离子引出效率，并且可以通过对外加磁场的调节来控制等离子体密度。
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