Design of pulsed power source driving flash X-ray diodes
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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 形成线充电电压为3.3 MV,并最终在40 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 a pulsed power driver and a diode. Pulse forming line (PFL) and transmission line are utilized to generate high voltage with several MV on diode, and the function of the latter is to compress the pulse rise time and match the impedance of PFL to diodes. Impedance and capacitance of these coaxial lines are calculated to get the highest voltage and certain pre-pulse on load, respectively. Configuration of diode insulators are designed based on radial grading rings, and the layout of a flash X-ray generator is proposed. The results show that a voltage of 4 MV is generated on 40 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.
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