The design of the gun is commonly defined by perveance, beam current, waist radius, waist position and cathode current density.

它的设计主要有导流系数、流、腰半径、腰位置以及阴极电流密度。

The structure of the MIGmust be carefully selected, as the tiny change on it will affect beam performance highly, and beam current will fluctuate punily.

同时，还发现由于阳极结构的变化导致阴极电场分布的变化，使电子注的注电流在各因子变化过程中出现了微小的扰动。