多路并联LTD型Z箍缩装置电路参数优化

Optimization of Circuit Parameters for Multi-Module LTD-Based Z-Pinch Accelerators

基于传输线电路编码和粒子群引力搜索算法,建立了多路并联大型Z箍缩装置电路参数自动优化方法。在给定负载(丝阵质量、初始半径及高度、压缩比等)和预期输出指标(电流峰值、聚爆时间等)等要求下,考虑了快脉冲直线型变压器驱动源(linear transformer driver,LTD)单感应腔和绝缘堆栈等核心部件的工程限制参数,获得使Z箍缩装置能量传输效率最大的LTD感应腔串并联组合数量、绝缘堆外半径、整体径向线电长度及输出阻抗等参数。采用该方法优化获得的Z-300装置参数和文献结果吻合。以峰值电流为30 MA、聚爆时间为157 ns的Z箍缩设计装置为例,分析了绝缘堆栈最大平均工作电场强度、LTD初级脉冲源充电电压和LTD感应腔参数等对电路参数的影响。

In this paper,an automatic optimization method is developed to optimize the multi-module large scale Z-pinch accelerators based on the transmission line circuit code and particle swarm optimization gravitation search algorithm(PSOGSA).With any designated load(initial mass,initial radius and height,convergence ratio,etc)and desired output parameters(peak load current and load implosion time),the model considers the engineering limiting issues in LTD cavity and the insulator stack,and obtains the connection and parallel combination of LTD cavities,the outer radius of the stack-MITL system,electrical length and output impedance of monolithic radial transmission lines to maximize the energy transport efficiency.By using this method,the optimization result of Z-300 accelerator agrees well with the data from the reference.Taking the Z-pinch accelerators with a peak current of 30 MA and an implosion time of 157 ns as an example,the influences of maximum mean electric field strength at the induction stack,the LTD charging voltage,and the parameters of LTD cavity on the optimization results are analyzed.