二维空间电荷限制流实验研究  

Experimental study of two-dimensional space charge limited current

作　　者：张开春[1] 吴振华[1] 

机构地区：[1]电子科技大学物理电子学院THz研究中心,四川成都610054

出　　处：《大学物理》2014年第6期20-23,共4页College Physics

基　　金：国家863项目(G06010401AA8122007B);自然科学基金重点项目(61231005)资助

摘　　要：对基于圆柱平板结构电子枪的二维空间电荷限制流进行了研究.采用粒子模拟软件详细探讨了二维空间电荷限制流随间距、电压、逸出功、温度、阴极结构等物理量的变化关系.设计了一种实用圆柱平板结构电子枪,对其空间电荷限制流和发射性能进行了实验探索.通过测试,发射电流与二维模型的比较吻合,远大于一维模型的结果.Two-dimensional （2D） space charge limited current （SCLC） of an electron gun based cylinder pla- nar structure is studied. The relation of the 2D SCLC varying with many parameters, such as the distance between the cathode and the anode, cathode voltage, work function, cathode temperature as well as the cathode structure, is investigated in detail, which is more plentiful than that of Child-Langmuir law. A practical E-gun is designed and its SCLC and emitting performance are experimentally explored. The experimental result of the SCLC agrees well with that of 2D model.

关 键 词：平板结构电子枪 二维空间电荷限制流 电真空器件 

分 类 号：O441[理学—电磁学]