Common-frequency mode suppressing of overmoded relativistic backward wave oscillator with wide-gap reflector

Zhang Xiaowei; Li Yongdong; Bai Xianchen; Liang Yuqin

doi:10.11884/HPLPB201527.073003

Volume 27 Issue 07

Jun. 2015

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Li Haibo, Shen Li, Zhai Jun, et al. Nanosecond grade edge chopper power supply system of high current proton accelerator[J]. High Power Laser and Particle Beams, 2017, 29: 085001. doi: 10.11884/HPLPB201729.170086

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Zhang Xiaowei, Li Yongdong, Bai Xianchen, et al. Common-frequency mode suppressing of overmoded relativistic backward wave oscillator with wide-gap reflector[J]. High Power Laser and Particle Beams, 2015, 27: 073003. doi: 10.11884/HPLPB201527.073003

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Common-frequency mode suppressing of overmoded relativistic backward wave oscillator with wide-gap reflector

doi: 10.11884/HPLPB201527.073003

1.
Key Laboratory for Physical Electronics and Devices of Ministry of Education,Xi’an Jiaotong University,Xi’an 710049,China;
2.
Science and Technology on High Power Microwave Laboratory,Northwest Institute of Nuclear Technology,P.O.Box 69,Xi’an 710024,China

Received Date: 2015-03-26
Rev Recd Date: 2015-05-19
Publish Date: 2015-06-23

Abstract

Abstract

The mode controlling is a key process for designing an overmoded relativistic backward wave oscillator. Based on the numerical analysis and particle-in-cell simulation, the common-frequency high-order mode competition and output mode controlling of an overmoded RBWO with a wide-gap reflector are studied. It indicates that the high-order mode is mainly originated from the reciprocal mode conversion and excitation in the RF structures, which can be restrained and controlled by optimizing the sensitive parameters, reducing the conversion factor from fundamental mode to high-order one and adjusting the RF phases of different modes that are reflected back to the beam-wave interaction region from the cathode plate. Finally, a beam-wave conversion efficiency of 40% and an output TM01 mode purity of 98% are obtained at frequency of 9.87 GHz from the concerned overmoded RBWO.
- common-frequency high-order mode,
- overmoded relativistic backward wave oscillator,
- wide-gap reflector

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