4层圆盘锥形磁绝缘传输线的电流测量  

Current measurement for four-level magnetically-insulated transmission line

作　　者：卫兵[1] 卿燕玲[1] 丰树平[1] 计策[1] 夏明鹤[1] 傅贞[1] 李勇[1] 任济[1] 宋盛义[1] 王勐[1] 

机构地区：[1]中国工程物理研究院流体物理研究所,脉冲功率科学与技术重点实验室,四川绵阳621999

出　　处：《强激光与粒子束》2014年第8期261-266,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(1135007);中国工程物理研究院科学技术发展基金项目(2012A0402017;2012B0402053)

摘　　要：为获取PTS装置磁绝缘传输线的电流,设计、标定了微分环。探头使用镍铬合金膜屏蔽空间电子,采用在线标定。设计相应的馈入结构从负载区分别对不同层磁绝缘传输线馈入信号,在每个三平板传输线出口的板堆过渡区位置安装短路杆,能够在磁绝缘传输线上得到基本均匀的电流,实现电流探头的逐层标定。频响分析表明金属膜屏蔽效应导致探头的高频特性变差。实验表明,贴膜的探头频响上限为50.3MHz,满足被测信号的要求。实测PTS装置磁绝缘传输线电流与负载区电流的测量结果自洽,且各层电流与总电流等结果符合理论预计。Differential-output current loops （B-dot probes） were designed and calibrated to derive magnetically-insulated transmission line（MITL） current in the PTS facility. Nichrome films were used to shield the loops from sheath electrons. All the B-dots were calibrated insitu. A feeding structure was designed to drive the MITLs from load area. In order to realize uniform current distribution azimuthally, MITL was terminated with short-circuit rods at the end of the corresponding tri-plate water line. Then the B-dots at each level could be calibrated respectively. Frequency response analysis indicates that the using of nichrome film makes the high frequency characteristics worse for B-dots. It shows in experiments that B-dots＇ upper limiting frequency is 50.3 MHz, which is satisfactory for current measurement in our experiments. It also shows that MITL current and load current are self-consistent. Current of each level and combined current of all levels are reasonable according to theoretical predictions.

关 键 词：磁绝缘传输线 脉冲电流 频率响应 

分 类 号：TM835.4[电气工程—高电压与绝缘技术]