It is found that the change of threshold voltage value fits in exponential law with absorbed dose, which is caused by the effect of space charge and interface charge.
产生这种现象的原因是场效应管氧化物中的空间俘获电荷与吸收剂量近似成线性变化，对阈值电压变化和吸收剂量有近似线性的改变；
The nonlinear space charge effect due to the nonuniform particle density distribution in bunched beam of a linac is discussed.
提出了在强流直线加速器中，由空间电荷束团的密度分布所引起的非线性效应。
Simulation and measurement result indicate that magnetic field influence the beam current of MIG, and the beam current of the MIG depends on the cathode temperature and space charge effect.
模拟和测量结果显示磁场对MIG的束流有影响，MIG的束流也与阴极温度和空间电荷效应有关系。
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