磁绝缘传输线电压测量用自积分式电容分压器研制

Self-integral capacitance divider used for voltage measurement along magnetically insulated transmission lines

研制了一种用于磁绝缘传输线(MITL)电压测量的自积分式电容分压器;利用PSpice软件和标定实验数据,建立了该分压器等效电路模型,给出了分压器系统传递函数,并分析了分压器频率响应特性。计算结果表明:该分压器对于被测信号大于5MHz频率分量部分的相频和幅频响应无明显畸变。基于"强光一号"长1.0m、阴阳极间隙2cm的同轴型MITL实验平台对该分压器实际工作性能进行了考核。实验结果表明,在相对少量场致发射电子抵达阳极表面的条件下,该分压器能够有效测量MITL沿线电压波形(2.07Ω负载条件下,电压峰值约600kV、峰值时间约80ns)。

A self-integral capacitance divider used for voltage measurement along the magnetically insulated transmission line was developed. By using the commercial PSpice software, the equivalent circuit model, transfer-equations and lrequency respon- ses of the divider were obtained. The calculation results show that signals with frequency more than 5 MHz can be perfectly meas- ured by the divider. Based on the test stand of the＂Qiangguang- I ＂ coaxial magnetically insulated transmission line （MITL） with 1 m length and 2 cm AK gap, the working characteristics of the divider was tested. Experimental results show that with little electron reached the anode surface, the divider developed above can be perfectly used for the measurement of the voltage pulse along the MITL （with peak voltage 600 kV, risetime 80 ns）.