| 空间电荷效应对阴极微凸起热不稳定性的影响 |
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| 引用本文： | 孙钧,刘国治,林郁正.空间电荷效应对阴极微凸起热不稳定性的影响[J].强激光与粒子束,2006,18(10):1699-1701. |
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| 作者姓名： | 孙钧 刘国治 林郁正 |
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| 作者单位： | 1. 清华大学 工程物理系， 北京 100084；2. 西北核技术研究所， 西安 710024 |
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| 基金项目： | 国家863计划项目资助课题 |
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| 摘 要： | 由于金属微凸起爆炸电子发射的预发射电流密度一般都超过108 A/cm2，因此必须考虑其空间电荷效应的影响。基于金属微凸起爆炸电子发射起始过程模型，通过理论分析和数值模拟，给出了考虑预发射电流空间电荷效应的微凸起爆炸发射延迟时间随二极管平均电场的变化关系。与不考虑预发射电流空间电荷效应的结果进行对比表明，预发射电流的空间电荷效应可以显著增加金属微凸起的爆炸发射延迟时间。
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| 关 键 词： | 微凸起 爆炸电子发射 预发射电流 空间电荷效应 |
| 文章编号： | 1001-4322(2006)10-1699-03 |
| 收稿时间： | 2006-03-21 |
| 修稿时间： | 2006-08-09 |
Influence of space charge effect on thermal instability of cathode microprotrusion |
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| SUN Jun,LIU Guo-zhi,LIN Yu-zheng.Influence of space charge effect on thermal instability of cathode microprotrusion[J].High Power Laser and Particle Beams,2006,18(10):1699-1701. |
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| Authors: | SUN Jun LIU Guo-zhi LIN Yu-zheng |
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| Institution: | 1. Department of Engineering Physics, Tsinghua University, Beijing 100084, China;2. Northwest Institute of Nuclear Technology, P.O.Box 69, Xi’an 710024, China |
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| Abstract: | Due to the high density of the prebreakdown current of explosive electron emission,the space charge effect should be considered in the simulation of the initial thermal instability of explosive electron emission.Based on the metallic microprtrusion model of explosive electron emission,a model dealing with the space charge effect is presented.The simulation results show that the space charge effect could greatly lengthen the delay time of explosive electron emission.According to the simulation,the thermal instability process is strongly affected by the space charge effect of prebreakdown current.The space charge effect of prebreakdown current should not be neglected in the analysis of microprotrusion model of explosive electron emission. |
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| Keywords: | Microprotrusion Explosive electron emission Prebreakdown current Space charge effect |
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