如果碳纳米管阴极附近的真空度太低，将产生打火、气体电离、离子回轰阴极等问题，将导致阴极发射电流的迅速衰减。

If the vacuum near the cathode is too poor, it will generate spark, gas ionization and ion bombardment on cathode, which can result in a fast attenuation of the emission current.

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微波管剧烈打火不一定都是管子本身的问题。

All the severe sparking in a microwave tube may not be the troubles of the tube itself.

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