摘要
对空心阴极等离子体电子枪的理论与机理做了较详细的分析 ,介绍了空心阴极放电特性 ,论述了激励电极和调制电极在空心阴极内等离子体形成过程中的作用 ,分析了等离子体中电子和离子的运动及主要参数 ,推导出空心阴极内电场与电流密度的表达式 ,研究了形成稳定电子束流的基本条件 .利用泊松方程、电流连续性方程和运动方程对其进行了数值模拟计算 ,并给出了优化结果 .在此基础上设计出了输出束流脉宽为 1μs、幅值达
For developing a novel high-current, long pulsewidth electron source, the theoretics and mechanism of the hollow cathode plasma electron-gun are analyzed in detail in this paper, the structure and the physical process of hollow cathode plasma electron-gun are also studied. This gun overcomes the limitations of most high-power microwave tubes, which employ either thermionic cathodes that produce low current-density beams because of the limitation of the space charge, or field-emission cathodes that offer high current density but provide only short pulsewidth because of plasma closure of the accelerating gap. In the theories studying on hollow cathode plasma electron-gun, the characteristic of the hollow-cathode discharge is introduced, the action during the forming of plasma of the stimulating electrode and the modulating anode are discussed, the movement of electrons and ions and the primary parameters are analyzed, and the formulas of the electric field, beam current density and the stabilization conditions of the beam current are also presented in this paper. The numerical simulation is carried out based on Poisson's equation, and the equations of current continuity and movement. And the optimized result is reported. On this basis, we have designed a hot-low-cathode-plasma electron-gun, whose output pulse current is 2kA, and pulse width is 1 microsecond.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2003年第7期1676-1681,共6页
Acta Physica Sinica
基金
国家高技术研究发展计划 (批准号 :863 410 7 3 )
中国工程物理研究院科学技术基金 (批准号 :2 0 0 2 0 43 0 )资助的课题~~
