该磁控管具有加热时间短的阴极，屏蔽阴极，液体和空气冷却，内建无线电滤波。
Magnetron has filamentary cathode with small time hearting the shielded cathodic site liquid and air cooling and also the filter built-in by radio.
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.
另外压载水舱内部结构复杂，“屏蔽效应”对保护电流分布的影响也成为阴极保护设计中的关键问题。
In addition, inside structure of ballast water tank is very complex, shield effect to protective current also becomes a key problem in cathodic protection design.
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