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Analysis of ion noise with beam-wave interaction in klystron by two dimensional particle simulation method

Gong Hua-Rong Gong Yu-Bin Wei Yan-Yu Xue Dong-Hai Wang Wen-Xiang Tang Chang-Jian

Analysis of ion noise with beam-wave interaction in klystron by two dimensional particle simulation method

Gong Hua-Rong, Gong Yu-Bin, Wei Yan-Yu, Xue Dong-Hai, Wang Wen-Xiang, Tang Chang-Jian
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  • Received Date:  28 September 2005
  • Accepted Date:  23 February 2006
  • Published Online:  05 May 2006

Analysis of ion noise with beam-wave interaction in klystron by two dimensional particle simulation method

  • 1. (1)电子科技大学 物理电子学院,成都 610054; (2)四川大学 应用物理学院,成都 610064

Abstract: Ion noise in output signal of klystrons was obtained by particle-in-cell method. The interactions between beam electron, ion, secondary electron and electromagnetic field are illustrated. The mechanism of ion noise is analyzed. It shows that phase fluctuation in output signal is caused by the change of the beam current DC velocity which is affected by the change of the amount of ions. The ion interacts with beam electron and has no equilibration state. The amount of secondary electrons is small and it has little effect on ion noise, but its behaviors reflect the process of ion noise. The amplitude fluctuation of output signal is caused by the change of beam velocity and beam radius. It is also affected by the ion behaviors.

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