强激光与粒子束, 2015, 27 (5): 055006, 网络出版: 2015-05-20
X光二极管实验平台初步设计
Design of pulsed power source driving flash X-ray diodes
闪光X光机 脉冲功率源 水介质同轴线 径向均压绝缘堆 闪光照相 flash X-ray generator pulsed power driver water coaxial lines radial insulator stack with grading rings flash radiography
摘要
采用Marx发生器结合水介质同轴线设计了高压脉冲功率源, 在X射线二极管负载上可产生数 MV高压输出。通过电压波过程分析, 给出了在负载上获得最大电压输出条件下的形成线、传输线的阻抗设计原则。通过集中参数电路模型分析, 给出了一定预脉冲幅值下形成线、传输线电长度及中储设计原则。结合水介质正极性耐压Martin经验公式进行绝缘设计, 二极管采用径向均压绝缘堆结构, 给出了整个装置初步方案设计。基于Pspice的全系统电路模拟表明: 当中储运行电压为2.6 MV时, 对3 Ω形成线充电电压为3.3 MV, 并最终在40 Ω负载上获得4 MV电压输出, 且充电过程中负载脉冲幅值约为形成线充电电压的1.2%, 在现有条件下, 该平台设计指标能够满足实验预期。
Abstract
Flash x-ray generator comprises pulsed power driver and diode. Pulse forming line (PFL) and transmission line are utilized to generate high voltage with several MV on diode, the function of the latter is compressing pulse rise time and matching impedance of PFL to diode’s. Impedance and capacitance of these coaxial lines are calculated to getting the highest voltage and certain pre-pulse on load, respectively. Configuration of diode insulators are designed based on radial grading rings, and layout of flash x-ray generator is proposed. The results show that voltage 4 MV is generated on 40 Ω load when 2.6 MV and 3.3 MV voltage charging to immediate storage energy and PFL, respectively. Meanwhile the pre-pulse is about 1.2% of charging voltage to PFL.
马勋, 邓建军, 计策, 丰树平, 王勐, 刘宏伟. X光二极管实验平台初步设计[J]. 强激光与粒子束, 2015, 27(5): 055006. Ma Xun, Deng Jianjun, Ji Ce, Feng Shuping, Wang Meng, Liu Hongwei. Design of pulsed power source driving flash X-ray diodes[J]. High Power Laser and Particle Beams, 2015, 27(5): 055006.
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