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Chinese Physics, 2003, Vol. 12(2): 204-207    DOI: 10.1088/1009-1963/12/2/315
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES Prev   Next  

Space-charge limiting current in spherical cathode diodes

Liu Guo-Zhi (刘国治), Shao Hao (邵浩)
Northwest Institute of Nuclear Technology, Xi'an 710024, China
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.
Keywords:  diode      space-charge limiting current      relativistic electron beam  
Received:  03 October 2002      Revised:  04 November 2002      Accepted manuscript online: 
PACS:  52.59.Mv (High-voltage diodes)  
  52.65.Rr (Particle-in-cell method)  
  41.75.Ht (Relativistic electron and positron beams)  
Fund: Project supported by the National High Technology Development Program of China (Grant No 2002AA834060).

Cite this article: 

Liu Guo-Zhi (刘国治), Shao Hao (邵浩) Space-charge limiting current in spherical cathode diodes 2003 Chinese Physics 12 204

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