Differential B-dot monitor used for current measure of magnetically insulated transmission lines
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摘要: 研制了一种用于磁绝缘传输线（MITL）电流测量的差模式B-dot探头;利用PSpice商用软件和标定实验数据，建立了该探头等效电路模型，给出了探头系统传递函数，并分析了探头频率响应特性。计算结果表明，该探头对于被测信号大于2.5 MHz频率分量部分的相频响应基本保持不变，而幅频响应曲线呈较好的直线性。该探头已用于强光一号1.0 m长、2 cm阴阳极间隙的同轴型MITL电流传输特性研究实验，并获得了较好的测量波形。测量结果表明：短路负载条件下，传输线沿线不同位置B-dot 电流测量结果基本相同，峰值电流约1.0 MA、峰值时间约125 ns。即传输线沿线电流损失几乎可以忽略，该实验结果与短路负载MITL工作特性理论较好地吻合。Abstract: A differential B-dot used for current measure of the magnetically insulated transmission lines (MITL) has been developed. By using the commercial PSpice software, the equivalent circuit model of the B-dot monitor, the transfer-equations and the frequency responses of the B-dot were obtained. Calculation results show that signals with frequency more than 2.5 MHz can be perfectly measured by the B-dot. This B-dot monitor has been used for the 1.0 m long, 2 cm AK gap coaxial-MITL experiments on QiangGuang-Ⅰ accelerator. Experimental results show that with the shorted load, the current waveforms measured by the B-dots along the MITL are almost the same (the peak current is 1.0 MA, and the risetime is 125 ns), namely, the current loss along the line is negligible. This results perfectly accord with the theoretical transfer characteristics of the MITL with shorted load.
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