摘要
为测量高功率水介质三平板传输线的电压,设计、标定了一种D-dot探头,安装在三平板线的入口和出口处,探头感应脉冲电压的微分信号。探头与基座之间的绝缘层为浇注的环氧树脂,可以在满足密封去离子水的要求下,使探头对地电容较小,从而获得良好的高频响应。利用ANSYS对探头结构进行了优化设计,使三相点位置的电场强度得到有效降低。使用经线下标定过的电阻分压器进行标定。实验中采用电容器放电,用一段高压电缆作为脉冲形成线获得逐级上升的快前沿(约70 ns)电压脉冲,并将之作为标定信号源,标定得到三平板线入口、出口探头的灵敏度分别为386 kV/V和402 kV/V。探头测量结果与电路模拟结果一致。在三平板线耐压实验中,板线出口电压达到了3.1 MV,探头的绝缘结构设计能够满足要求。实验结果表明该探头适合高功率三平板传输线电压的测量。
Two D-dot monitors have been designed to measure the voltage pulse on a high-power triplate transmission line. One has been installed in the entrance and the other in the exit. A signal proportional to the time derivative of voltage is given from the D-dot monitor, and the voltage can be got by a passive by integrator. Insulation of probe is achieved by epoxy, and dispersed capacitance between the probe and the ground can reduce by the designed waterproof configuration. Two-dimensional electrostatic simulations show that the amplitude of electric field at water-insulator-metal triple-point is low. These monitors are calibrated in-situ using a calibrated resistive divider and a pulser which produces high voltage with an HV cable as a forming llne. The generated signal with steps and rise time of 70 ns is suitable for the calibration. And the calibrated sensitivieies of D-dots of entrance and exit are 386 kV/V and 402 kV/V, respectivily. The wave shapes of the monitor＇s output are in agreement with calculated results with the equivalent circuit method. The monitors can give reasonable signals and no breakdown occurs with the voltage of triplate transmission line up to 3.1 MV. The experiment result indicates that these D-dot monitors are satisfactory to the measurement requisition.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2008年第7期1225-1228,共4页
High Power Laser and Particle Beams
基金
国防科技基础研究基金资助课题
关键词
脉冲测量
D-dot探头
脉冲传输线
电路模拟
标定
Pulse measurement
D-dot
Pulse transmission line
Simulation of circuit
Calibration
