4 MV感应电压叠加器的电压测量  

Voltage measurement for 4 MV induction voltage adder

作　　者：卫兵[1] 郭帆[1] 康军军[1] 耿力东[1] 李勇[1] 夏明鹤[1] Wei Bing;Guo Fan;Kang Junjun;Geng Lidong;Li Yong;Xia Minghe(Key Laboratory of Pulsed Power,Institute of Fluid Physics,CAEP,Mianyang 621999,China)

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》2023年第9期117-122,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(51907181)。

摘　　要：为测量4 MV感应电压叠加器的电压,设计和标定了多个D-dot电压探头。频响测试结果表明探头频率上限大于270 MHz,满足待测电压信号频率响应需求。标定中,由于分压器与探头的安装位置不同,为了避免传输线阻抗失配导致快前沿电压信号在不同测量点的电压波形差异,采用前沿数百纳秒的脉冲信号开展标定。由于探头的低频特性同时满足标定与实测的需求,因而标定的准确性得以保证。考虑装配结构及精度对探头灵敏度的直接影响,次级电压探头采取了在感应腔逐级安装过程中的在线标定方法。由于靠近二极管的电压探头受到电子等影响导致波形畸变,因此直接测量负载电压存在困难。4 MV装置的多发实验结果表明,输出端传输线上电压波形与其下游位置电压波形之差,与用两者之间电感计算的电压波形相吻合,说明采用二极管上游电压探头的测量结果来计算二极管电压是行之有效的。Multiple D-dot voltage probes were designed and calibrated to measure the voltage of a 4 MVinduction voltage adder.The frequency response test results indicate that the upper limit of the probe frequency isgreater than 270 MHz,which meets the frequency response requirements of the voltage signal to be tested.Incalibration,due to the different installation positions of the voltage divider and probe,in order to avoid the mismatchof transmission line impedance causing voltage waveform differences in the fast rising voltage signal at differentmeasurement points,a pulse signal with a front edge of about hundreds of nanoseconds is used for calibration.Due tothe low-frequency characteristics of the probe meeting both calibration and actual measurement requirements,theaccuracy of calibration can be guaranteed.Considering the direct impact of assembly structure and accuracy on thesensitivity of the probe,the output transmission line probe adopts an online calibration method during the step-by-stepinstallation process of the induction cavity.Due to the influence of electrons and other factors on the voltage probenear the diode,waveform distortion occurs,making it difficult to directly measure the load voltage.The results ofmultiple experiments on a 4 MV device indicate that the difference between the voltage waveform on the outputtransmission line and its downstream position is consistent with the voltage waveform calculated using the inductancebetween the two position,indicating that using the measurement results of the upstream voltage probe of the diode tocalculate the diode voltage is effective.

关 键 词：感应电压叠加器 脉冲电压 D-dot探头 频率响应 标定 

分 类 号：TM835.4[电气工程—高电压与绝缘技术]