Liu Xiao, Li Song, Peng Wei, Gao Jingming, Yang Hanwu
College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China.
Rev Sci Instrum. 2021 Feb 1;92(2):024708. doi: 10.1063/5.0025917.
A pulse forming network (PFN) has the advantages of compactness and long pulse achievability, which could meet the requirements of military and industrial applications of pulsed power technology well. In this paper, a compact low impedance Blumlein-type PFN based on ceramic capacitors is investigated numerically and experimentally. Generally, in order to increase the compactness of the PFN, an angular distribution and an axially parallel connected structure with a theoretical peak energy density of up to 5.8 J/L are employed. The dimensions of the PFN are Φ 560 × 345 mm. A sharpening switch, which can efficiently reduce rise-time of the output pulses, is utilized to improve the performance of the PFN. The compact low impedance Blumlein-type PFN was assembled in our laboratory. The results of low voltage experiments show that the PFN could generate quasi-square pulses with an output power of 50 MW and a peak voltage of approximately 13.2 kV on a matched dummy load. Impedance and output pulse duration of the PFN are 3 Ω and 135 ns, respectively. The results of high voltage experiments show that pulses with a power of about 1 GW and an energy density of about 2.5 J/L were obtained. Experiments show reasonable agreement with numerical analysis.
脉冲形成网络（PFN）具有紧凑性和能够产生长脉冲的优点，能够很好地满足脉冲功率技术在军事和工业应用中的需求。本文对一种基于陶瓷电容器的紧凑型低阻抗勃姆勒型脉冲形成网络进行了数值和实验研究。一般来说，为了提高脉冲形成网络的紧凑性，采用了角分布和轴向并联连接结构，其理论峰值能量密度高达5.8焦耳/升。脉冲形成网络的尺寸为Φ 560 × 345毫米。使用一种能够有效降低输出脉冲上升时间的锐化开关来改善脉冲形成网络的性能。紧凑型低阻抗勃姆勒型脉冲形成网络在我们实验室进行了组装。低压实验结果表明，该脉冲形成网络在匹配的假负载上能够产生输出功率为50兆瓦、峰值电压约为13.2千伏的准方波脉冲。脉冲形成网络的阻抗和输出脉冲持续时间分别为3欧姆和135纳秒。高压实验结果表明，获得了功率约为1吉瓦、能量密度约为2.5焦耳/升的脉冲。实验结果与数值分析结果吻合良好。
