Simulation Analysis of Transmission-Line Impedance Transformers for Petawatt-Class Pulsed Power Accelerators

• 作者: 丛培天 呼义翔 孙风举 张信军 曾江涛 李岩 王亮平 邱爱慈 雷天时 黄涛
• 来源期刊: 等离子体科学和技术：英文版
• 学科: 工学
• 关键词: 绝缘变压器 输入阻抗 传输线路 仿真分析 脉冲功率 加速器 运输时间 电路模型
• 年，卷（期）: 2011,（4）
• 所属期刊栏目: FUSION ENGINEERING
• 页码范围: 490-496
• 页数: 7页
• 分类号: TN820|TV734.3
• 语种: 英文

摘要

Based on the transmission line code TLCODE, a 1D circuit model for a transmission- line impedance transformer was developed and the simulation results were compared with those in the literature. The model was used to quantify the efficiencies of voltage-transport, energy- transport and power-transport for a transmission-line impedance transformer as functions of ψ （the ratio of the output impedance to the input impedance of the transformer） and Г （the ratio of the pulse width to the one-way transit time of the transformer） under a large scale of m （the coefficient of the generalized exponential impedance profile）. Simulation results suggest that with the increase in Г, from 0 to ∞, the power transport efficiency first increases and then decreases. The maximum power transport efficiency can reach 90% or even higher for an exponential impedance profile （m = 1）. With a consideration of dissipative loss in the dielectric and electrodes of the transformer, two representative designs of the water-insulated transformer are investigated for the next generation of petawatt-class z-pinch drivers. It is found that the dissipative losses in the electrodes are negligibly small, below 0.1%, but the dissipative loss in the water dielectric is about 1% to 4%.