solenoid focusing 螺旋管聚焦
focusing solenoid
聚焦电磁
以上为机器翻译结果，长、整句建议使用 人工翻译 。
It is shown that the phenomenon is due to self-induced action in alternative magnetic field of electric solenoid and is of no effect to the point of magnetic focusing.
结果表明，此现象产生于螺线管交变磁场中的自感应作用，对于碰聚焦点不产生影响。
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