强激光与粒子束, 2014, 26 (10): 105102, 网络出版: 2014-12-08
介质壁加速器用固态脉冲形成线设计与实验
Design and experiments of solid-state pulse forming lines for dielectric wall accelerator
介质壁加速器 固态脉冲形成线 复合陶瓷 Blumlein脉冲形成线 光导开关 dielectric wall accelerator solid-state pulse forming lines composite ceramic Blumlein pulse forming lines photoconductive semiconductor switches
摘要
设计和研制了一种CaO-TiO2-Al2O3复合陶瓷平板固态脉冲形成线,以期用于介质壁加速器。该脉冲形成线的几何参数为:陶瓷介质长度300 mm,宽度15 mm,厚度1 mm;银电极长度280 mm,宽度2 mm。电性能参数为:相对介电常数约23.5,特征阻抗约26 Ω,电长度约4.5 ns,直流耐压场强大于20 kV/mm,在μs量级上升时间的脉冲电压下绝缘强度大于25 kV/mm。该固态脉冲形成线设计兼顾了光导开关的使用要求、高梯度绝缘子的设计指标、带电粒子束的输运及加速器的结构设计要求。结合GaAs光导开关,开展了固态Blumlein脉冲形成线实验研究工作,在脉冲充电电压约25 kV的条件下,固态Blumlein脉冲形成线实现脉冲电压输出约23 kV。
Abstract
The solid-state pulse forming lines (PFL) of CaO-TiO2-Al2O3 composite ceramic are designed and manufactured for the dielectric wall accelerator. The PFL’s geometric parameters are 300 mm long, 15 mm wide, 1mm thick of ceramic dielectric and 280 mm long, 2 mm wide of silver electrode. The electrical parameters are 23.5 relative dielectric constant, about 26 Ω characteristic impedance, 4.5 ns characteristic time, 20 kV/mm and 25 kV/mm breakdown field strength for DC and pulsed high voltage. The solid-state PFL’s design gives consideration to operating requirement of photoconductive semiconductor switches (PCSS), design parameters of high gradient insulator, charged particle beams transport and accelerator’s structural design. Combined with the PCSS, the experimental research of solid-state Blumlein PFL is performed. The solid-state Blumlein PFL could output about 23 kV pulsed voltage on the load under about 25 kV pulsed voltage.
谌怡, 刘毅, 陈莹, 王卫, 夏连胜, 张篁, 潘海峰, 吕璐, 张文斌, 朱隽, 石金水, 章林文, 邓建军. 介质壁加速器用固态脉冲形成线设计与实验[J]. 强激光与粒子束, 2014, 26(10): 105102. Shen Yi, Liu Yi, Chen Ying, Wang Wei, Xia Liansheng, Zhang Huang, Pan Haifeng, Lü Lu, Zhang Wenbin, Zhu Jun, Shi Jinshui, Zhang Linwen, Deng Jianjun. Design and experiments of solid-state pulse forming lines for dielectric wall accelerator[J]. High Power Laser and Particle Beams, 2014, 26(10): 105102.