Analysis of electron behaviour around a spring-shape filament inside a low-energy electron gun
Analysis of electron behaviour around a spring-shape filament inside a low-energy electron gun
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DOI：
10.1088/1742-6596/2244/1/012084
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发表时间：
2022-04
期刊：
影响因子：
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通讯作者：
Y. Matsumoto;H. Nakano;M. Kisaki;K. Shinto;M. Sasao;M. Wada
中科院分区：
文献类型：
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作者：
Y. Matsumoto;H. Nakano;M. Kisaki;K. Shinto;M. Sasao;M. Wada
采用实验和Particle-In-Cell模拟方法研究了基于弹簧灯丝的低能电子枪内的电子行为。我们预期的电子束能量范围为1至20 eV。分析表明，较小的灯丝尺寸更有利于提高电子枪引出孔前的电子密度，从而提高束流。研究了电子枪内空间电位分布与电子输运的关系。用于驱动灯丝以进行电子发射的加热器电压具有另一个作用，以在枪中形成空间电势分布。该电势将远离束引出孔的区域处的电子朝向该孔引导。通过在空穴附近感应出电子束引出电场，可以有效地实现电子的引出。
Electron behaviour inside a low-energy electron gun based on a spring-shape filament were studied with experiment and Particle-In-Cell simulation. The energy range of the electron beam which we expected was from 1 to 20 eV. The analysis told that smaller size of filament is more useful to improve electron density in front of an extraction hole in the gun to enhance beam current. Relation between a space potential distribution in the gun and electron transport was also studied. A heater voltage to drive a filament for thermionic electron emissions has another role to form a spatial potential distribution in the gun. The potential guides electrons, which are at a distant area from the beam extraction hole, toward the hole. It can be a significant help to realize efficient electron extraction by a beam extraction electric field induced near the hole.