自磁箍缩二极管物理特性研究

项目名称： 自磁箍缩二极管物理特性研究

项目编号： No.11305128

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 数理科学和化学

项目作者： 张鹏飞

作者单位： 西北核技术研究所

项目金额： 30万元

中文摘要： 自磁箍缩二极管(SMPD)能够产生焦斑直径约2mm的高能（>1MeV）脉冲X射线，是一种典型的强流箍缩二极管，可用于材料爆轰流体力学和高速运动物体的闪光透视照相等领域。SMPD完全依靠束流自身的磁场和工作过程中产生的等离子体达到强箍缩聚焦,其物理机制非常复杂，目前尚无合适的理论和数值模型能够准确描述其工作过程。 本项目拟采用理论分析、数值模拟和验证实验相结合的方法，研究影响二极管电子束箍缩和聚焦性能的因素，阳极等离子体发射模型，束流与阴阳极等离子体相互作用的机理，二极管几何结构设计及实验技术；建立与实验结果比较符合的并考虑等离子体影响的二极管数值模拟模型；研究改善电子束聚焦性能和X射线输出特性的方法；解决如何使束流尽快箍缩至阳极小尺寸区域、提高束流强度和X射线产生效率等技术问题。

中文关键词： 自磁箍缩二极管；脉冲X射线；等离子体；；

英文摘要： Self-magnetic pinch diode(SMPD), which is a typical intensive current pinched diode, can radiates high energy (>1MeV) pulsed X ray. The spot of X ray from SMPD is about 2mm that can be used for penetration of implosion material and radiography of hydrodynamic experiments. Pinched characteristic of SMPD is affected by both self magnetic motivated by charged particles movement and beam-plasma interaction between the gap of diode. So far, there is no exact theory or numerical model can explain dynamic principle of SMPD clearly. This item, which integrates with theory, numerical simulation and experiments, aims at research on factors influence on pinched characteristic of electron beam, model of anode plasma emission, principle of beams and plasma interaction, structures of diode and some experiments techniques. First of all, based on the experiments results of SMPD, find a proper way of numerical model to simulate dynamic principle of diode. Then, investigate how to optimize pinched characteristic of electron beam and X ray radiation. Improve current of beams and efficiency of X ray radiation, beams must pinch to the central area as soon as possible by design.

英文关键词： self-magnetic pinch diode；Pulse X-ray；plasma；；