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二极管爆炸发射阴极等离子体的膨胀扩展

Cathode plasma expansion in diode with explosive emission

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摘要

分析了二极管中爆炸发射产生阴极等离子体的演化特征,在考虑了阴极等离子体朝阳极膨胀运动使二极管阴阳极间距缩短这一效应的同时,还计入了阴极等离子体沿发射表面径向扩展运动对二极管有效发射面积的影响。基于Child-Langmuir定律,利用在一个四脉冲强流电子束源装置上得到的电流、电压等实验数据,假定阴极等离子体轴向膨胀和径向扩展速度近似相等,研究了阴极等离子体的膨胀扩展动力学行为。计算结果表明,阴极等离子体朝阳极的膨胀和沿径向的扩展速度为0.9~2.8 cm/μs。

Abstract

The evolution characteristics of the cathode plasma in a planar diode with explosive emission were analyzed. Besides the axial expansion which can reduce the effective anodecathode gap, the radial expansion of the cathode plasma which can affect the effective emitting area was also taken into account. According to the ChildLangmuir law and the experimental data of current and voltage with a electron vacuum diode under fourpulse mode, the dynamics of the cathode plasma was investigated, on the assumption that the radial speeds of the cathode plasma was approximately equal to the axial speed. The results show that the radial and axial expansion speeds of the cathode plasma are 0.92.8 cm/μs.

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中图分类号:O536

DOI:10.3788/hplpb20122406.1471

所属栏目:粒子束技术

基金项目:国家高技术发展计划项目

收稿日期:2011-09-28

修改稿日期:2011-12-16

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作者单位    点击查看

左应红:清华大学 工程物理系, 北京 100084西北核技术研究所, 西安 710024
王建国:西北核技术研究所, 西安 710024西安交通大学 电子与信息工程学院, 西安 710049
朱金辉:西北核技术研究所, 西安 710024
范如玉:清华大学 工程物理系, 北京 100084西北核技术研究所, 西安 710024

联系人作者:左应红(zuoyinghong@tsinghua.org.cn)

备注:左应红(1987-),男,博士,从事阴极电子发射理论及数值模拟方法研究

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引用该论文

Zuo Yinghong,Wang Jianguo,Zhu Jinhui,Fan Ruyu. Cathode plasma expansion in diode with explosive emission[J]. High Power Laser and Particle Beams, 2012, 24(6): 1471-1474

左应红,王建国,朱金辉,范如玉. 二极管爆炸发射阴极等离子体的膨胀扩展[J]. 强激光与粒子束, 2012, 24(6): 1471-1474

被引情况

【1】左应红,王建国,范如玉,朱金辉,牛胜利. 场致发射的温度效应对微波管爆炸电子发射的影响. 强激光与粒子束, 2013, 25(5): 1236-1240

【2】郝建红,曹占国,周前红. 轴对称真空二极管空间电荷限制流. 强激光与粒子束, 2018, 30(12): 123001--1

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