Volume 30 Issue 7
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Shi Yanchao, Teng Yan, Chen Changhua, et al. A high efficiency X-band over-mode relativistic backward wave oscillator[J]. High Power Laser and Particle Beams, 2018, 30: 073002. doi: 10.11884/HPLPB201830.170491
Citation: Shi Yanchao, Teng Yan, Chen Changhua, et al. A high efficiency X-band over-mode relativistic backward wave oscillator[J]. High Power Laser and Particle Beams, 2018, 30: 073002. doi: 10.11884/HPLPB201830.170491
shu

A high efficiency X-band over-mode relativistic backward wave oscillator

doi: 10.11884/HPLPB201830.170491

  • Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi'an 710024, China

  • Received Date: 2017-12-01
  • Rev Recd Date: 2018-01-29
  • Publish Date: 2018-07-15
    Abstract
  • This paper studies a high efficiency X-band over-mode relativistic backward wave oscillator (RBWO), which is composed of a dual-cavity reflector, a 7-periods trapezoid SWS and extraction cavity. The ratio of D to λ of the generator is 2.6, and the electron beam interacts with the TM01 near π mode of the structure wave. In the SWS region the TM01 mode surface wave mainly transfers to the TM02 mode body wave, the primary mode of the output microwave is TM02 mode with the proportion 81%, and the remainder is TM01 mode. A method to design the resonant reflector under over-mode condition is proposed, a dual-cylindrical cavity reflector is optimized by using the mode-matching method, and the reflection coefficients for the TM01 and TM02 modes are larger than 0.99, hence good insulation between the SWS and the diode is achieved. Simultaneously, the longitudinal electric field of the resonant reflector could pre-modulate the electron beam sufficiently, which would promote the beam-wave interaction in the SWS. Furthermore, the transfer coefficient is increased by loading the extraction cavity after the SWS. Simulation results indicate that microwave output power of 6.6 GW is achieved, the diode voltage is 900 kV and beam current is 14.3 kA, and the transfer efficiency is 51%.
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    • References(10)
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