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The investigation of electron optics system and beam-wave interactions for novel w-band sheet beam klystron
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Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences,Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences,Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences,Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences,Key Laboratory of High Power Microwave Sources and Technologies, Institute of Electronics, Chinese Academy of Sciences

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    Abstract:

    The cold fluid model theory are used for the transport and its instability for the sheet electron beam in the uniform magnetic field, which are indicated that, if the focusing magnetic field and the filling factor of the beam in tube are increased, the Diocotron instability will be decreased to achieve the transportation in long distance. Then, the 3D simulation method is developed to obtain the electron optics system for the W-band sheet beam klystron. Furthermore, a 2D macro-particle model for sheet electron beam is proposed to develop a beam-wave interaction simulation program code for SBK, named SBK2D. And the beam wave interaction processes for the W-band SBK with 8 multi-gap cavities are calculated using the SBK2D, the 69kW high frequency output with the efficiency of 24% , gain of 37 dB and 3dB bandwidth of 100MHz are observed. Finally, the w-band sheet beam tube is manufactured. The transmission rate and cross-section experiments are performed with the beam voltage of 20-82 kV, beam current of 0.5-4.27A, and the length of tunnel of 100mm，and more than 98% transmission rate with the beam cross-section about 10mmx0.5mm are obtained.

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RUAN Cun-Jun, WANG Shu-Zhong, HAN Ying, ZHANG XiaoFeng, CHEN Shu-Yuan. The investigation of electron optics system and beam-wave interactions for novel w-band sheet beam klystron[J]. Journal of Infrared and Millimeter Waves,2012,31(6):510~516

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History
  • Received:September 08,2011
  • Revised:March 02,2012
  • Adopted:October 09,2011
  • Online: November 21,2012
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