介质壁加速器用固态脉冲形成线设计与实验

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300mm,宽度15mm,厚度1mm;银电极长度280mm,宽度2mm。电性能参数为:相对介电常数约23.5,特征阻抗约26Ω,电长度约4.5ns,直流耐压场强大于20kV/mm,在μs量级上升时间的脉冲电压下绝缘强度大于25kV/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25kV的条件下,固态Blumlein脉冲形成线实现脉冲电压输出约23kV。

Design and experiments of solid-state pulse forming lines for dielectric wall accelerator

The solid-state pulse forming lines (PFL) of CaO-TiO2-Al2O3 composite ceramic are designed and manufactured for the dielectric wall accelerator. The PFLs 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 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 PFLs design gives consideration to operating requirement of photoconductive semiconductor switches (PCSS), design parameters of high gradient insulator, charged particle beams transport and accelerators 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.