用电光采样法测量相对论电子束团长度

介绍了电光采样法测量电子束束团长度的实验原理和装置，理论分析并模拟计算了被测电子束团库仑场分布、ZnTe晶体的电光效应与束团电场的关系，并利用琼斯矩阵法分析了探测光通过电光晶体时在束团电场作用下的偏振变化、测量信号与束团长度的关系等。分析表明:测量中应使束团库仑场垂直于ZnTe的［001］方向，探测光偏振方向与ZnTe晶体y″轴成45°或者135°夹角，1/4波片快轴与探测光偏振方向夹角应取45°，这时平衡探测器输出信号与束团库仑场Eb成正比。1/4波片的作用是将电光晶体的工作点从非线性段移到线性段，平衡探测的作用是简化信号与Eb的关系，并提高信噪比。为实际测量应用提供参考。

Suppression of electromagnetic interference in high power TEA CO2 laser system

The strong electromagnetic interference generated in high power TEA CO2 laser system mainly comes from the main discharge circuit, pulse spark switch and power supply. Such strong electromagnetic interference causes some problems such as data confusion, display frame frequency rolling and damage of power module, etc. in the high power TEA CO2 laser control sub-system. The parts in the high power TEA CO2 laser system where the strong electromagnetic interference occurs and the interference means are tested and analyzed. Adjusting the parameters of the discharge circuit to reduce the electromagnetic interference strength, adopting the patent technology of the buried coaxial high-voltage electric connector to shield the main discharge return circuit, using the PLC as the control core and shie