阳极杆箍缩二极管的理论模型及物理特性 |
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引用本文: | 耿力东,谢卫平,袁建强,王敏华,曹龙博,付佳斌,赵小明,何泱.阳极杆箍缩二极管的理论模型及物理特性[J].强激光与粒子束,2018,30(8):085003-1-085003-1. |
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作者姓名: | 耿力东 谢卫平 袁建强 王敏华 曹龙博 付佳斌 赵小明 何泱 |
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作者单位: | 中国工程物理研究院 流体物理研究所, 脉冲功率科学与技术重点实验室, 四川 绵阳 621999 |
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基金项目: | 国家自然科学基金项目11605183 |
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摘 要: | 闪光X射线源是获得高凝聚态物质内部物理图像的重要手段,阳极杆箍缩二极管(RPD)作为其重要组成部分之一,直接影响闪光X射线源照相质量。研究RPD物理特性对二极管物理结构优化设计及实验调试具有重要意义。分析了RPD空间电荷限制、弱箍缩和磁绝缘阶段物理模型。基于PIC模拟技术,编写了计算程序,研究了RPD不同阶段的电子电流、离子电流及电子束箍缩物理特性。通过理论分析,获得了特定几何结构RPD物理模型修正系数及各个阶段离子电流与电子电流比,验证了粒子模拟代码的有效性。模拟结果表明:空间电荷限制阶段,粒子模拟结果与双极性流计算结果一致;在弱箍缩和磁绝缘阶段,粒子模拟得到的总电流与磁绝缘模型计算结果一致,且与文献给出的经验拟合表达式计算结果一致;磁绝缘阶段离子电流与电子电流之比与电压和二极管几何结构相关,给出了离子电子电流比增大系数η与电压和阴阳极半径比的关系,该系数受电子、离子在不同结构二极管渡越时间的影响,随电压和阴阳极半径比增加而逼近恒定值。
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关 键 词: | 阳极杆箍缩二极管 闪光X射线源 粒子模拟 电子束 箍缩特性 |
收稿时间: | 2017-11-01 |
Theoretical modeling and physical characteristics of rod-pinch diode |
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Affiliation: | Key Laboratory of Pulse Power, Institute of Fluid Physics, CAEP, P.O.Box 919-108, Mianyang 621999, China |
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Abstract: | The rod-pinch diode (RPD) is a cylindrical pinched beam diode being developed as an intense pulsed small diameter bremsstrahlung source for flash X-ray radiography.The studying significance of the physical characteristics lies in optimizing geometry structure of RPD.Using PIC program and numerical simulation, a model of the rod-pinch diode operation based on space limited current at low voltage and self-magnetically limited current at high voltage is researched.Analysis shows that the diode characteristic is determined by space charge limited current at low voltage and self-magnetically limited critical current at high voltage.The simulation result is consistent with reference.Under the special conditions (space charge limited, weakly pinched and self-magnetically limited), the ratios of ion current to electron current are studied.The coefficient for calculating the self-magnetically limited ion to electron current ratio in the self-magnetically limited condition is affected by the electron and ion transit time and free from the high voltage. |
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