采用传输线方法研究了微通道板的短脉冲信号放大特性。分析了单脉冲信号的波形畸变以及微通道增益的变化情况。当信号饱和参数大于1时, 脉冲前沿消耗的电荷会对脉冲后沿的放大形成影响, 造成脉冲后沿增益下降。研究了多脉冲间的互扰问题。若前一脉冲放大消耗的电荷得不到及时补充, 将影响后续脉冲的放大过程。分析了信号频率对微通道板输出特性的影响。信号单脉冲电荷量恒定的情况下, 提高信号频率将使得微通道板增益显著下降; 信号平均电流恒定时, 通道增益以及输出电流基本不随信号频率发生变化。通过脉冲激光对像增强器的辐照实验, 验证了上述分析结果的正确性。

The short pulse signal amplification of a microchannel plate was studied by the transmission line method. The distortion of a single pulse signal and the change of the gain of the channel were discussed in detail. When the signal saturation parameter was more than 1, charges extracted by the pulse front edge can decrease the gain of the pulse trailing edge, resulting in the decrease in the gain of the pulse back edge. In addition, the mutual interference between multiple pulses was analyzed. If the next pulse arrived before the electron charge extracted by the previous pulse was fully replenished, the amplification of the latter pulse would also be affected. The effect of signal frequency on the gain of a microchannel plate was studied. When the total charges of a single pulse were constant, increasing the signal frequency could decrease the gain of microchannel plate. And the effect of signal frequency on the gain of the microchannel was not significant for signals with a same average current. The correctness of the above analysis was verified by the irradiation experiment of pulse laser on the image intensifier.