10 GW甘油介质双螺旋Blumlein脉冲形成线

10 GW dual-spiral Blumlein pulse forming lines in glycerol medium

为实现脉冲驱动源的高储能密度和紧凑化,研制了一种以甘油为储能介质,具有中筒螺旋和内筒螺旋的高功率双螺旋Blumlein脉冲形成线(BPFL)。首先,综合绝缘稳定性和储能密度考虑,分别计算BPFL的外线和内线尺寸。利用增加中筒和内筒螺旋的方式增加输出脉宽和形成线阻抗,实现BPFL的紧凑化设计。其次,利用场路协同仿真软件计算形成线内的瞬态场位形变化,结合瞬态场分布分析电压波在形成线内的传输过程,给出外线和内线传输时延的仿真结果。在此基础上,对中筒螺旋匝数、内筒螺旋匝数,以及开关电感等影响输出波形质量的情况进行详细分析。最后,根据仿真优化结果搭建基于双螺旋BPFL的10 GW实验平台。利用脉冲变压器对BPFL充电600 kV,在10 Hz重频条件下运行10 s,于50Ω负载上产生峰值电压712 kV、半高宽136 ns的准方波脉冲,单脉冲能量与BPFL体积比达到10.8 kJ/m^(3),脉冲平顶峰峰值抖动为3.8%,与仿真结果吻合度较高。

To achieve high energy storage density and compact design of pulsed power source,a high power dual-spiral Blumlein pulse forming line(BPFL)using glycerol as energy storage medium is developed.The dual-spiral BPFL has a spiral middle cylinder and a spiral inner cylinder.Firstly,based on the consideration of insulation stability and energy storage density,the outer line and the inner line dimensions of the BPFL are calculated respectively.The output pulse width and line impedance are increased by adding the spiral on the middle cylinder and inner cylinder.Secondly,the transient field configuration in the BPFL is simulated by using the EM/circuit co-simulation software,and the transmission process of voltage wave in the BPFL is analyzed by the transient field distribution.The simulation results of the transmission delay in the outer line and the inner line are carried out.On this basis,the number of spiral turns in the middle cylinder and inner cylinder,and the inductance of the switch that affect the quality of the output waveform are analyzed.Finally,a 10 GW experimental platform based on dual-spiral BPFL is built according to the simulation optimization results.A pulse transformer is used to charge the BPFL to 600 kV.The device operated for 10 s under the frequency of 10 Hz.A quasi-square pulse with peak voltage of 712 kV and full width at half maximum(FWHM)of 136 ns was generated on a 50Ωload.The ratio of single pulse energy to BPFL volume is 10.8 kJ/m^(3).And the peak-peak jitter of the pulse flat top is 3.8%,which has a high fitness with the simulation results.