中国物理B ›› 2003, Vol. 12 ›› Issue (2): 204-207.doi: 10.1088/1009-1963/12/2/315

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Space-charge limiting current in spherical cathode diodes

刘国治, 邵浩   

  1. Northwest Institute of Nuclear Technology, Xi'an 710024, China
  • 收稿日期:2002-10-03 修回日期:2002-11-04 出版日期:2003-02-16 发布日期:2005-03-16
  • 基金资助:
    Project supported by the National High Technology Development Program of China (Grant No 2002AA834060).

Space-charge limiting current in spherical cathode diodes

Liu Guo-Zhi (刘国治), Shao Hao (邵浩)   

  1. Northwest Institute of Nuclear Technology, Xi'an 710024, China
  • Received:2002-10-03 Revised:2002-11-04 Online:2003-02-16 Published:2005-03-16
  • Supported by:
    Project supported by the National High Technology Development Program of China (Grant No 2002AA834060).

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摘要： The results of the investigation on the space-charge limiting current for a spherical-cathode diode in the non-relativistic situation are presented in this paper. The results show that the current enhancement factor equals the square of E-field enhancement factor on the cathode surface. The generated space-charge limiting current is deduced. In the case of a pin-shaped-cathode diode, the space-charge limiting current is also obtained, indicating that the current is independent of the geometric parameters of the diode. Analyses of the shielding effects and the conditions for generation of the uniform space-charge limiting beam show that, for pin-arrayed cathodes, the distance between pins should be in the range from 1.2D to 1.5D, where D is the distance between the two electrodes.

Abstract: The results of the investigation on the space-charge limiting current for a spherical-cathode diode in the non-relativistic situation are presented in this paper. The results show that the current enhancement factor equals the square of E-field enhancement factor on the cathode surface. The generated space-charge limiting current is deduced. In the case of a pin-shaped-cathode diode, the space-charge limiting current is also obtained, indicating that the current is independent of the geometric parameters of the diode. Analyses of the shielding effects and the conditions for generation of the uniform space-charge limiting beam show that, for pin-arrayed cathodes, the distance between pins should be in the range from 1.2D to 1.5D, where D is the distance between the two electrodes.

Key words: diode, space-charge limiting current, relativistic electron beam

中图分类号:  (High-voltage diodes)

  • 52.59.Mv
52.65.Rr (Particle-in-cell method) 41.75.Ht (Relativistic electron and positron beams)