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Improvement of the Beam-Wave Interaction Efficiency Based on the Coupling-Slot Configuration in an Extended Interaction Oscillator

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Abstract

A method aimed at improving the beam-wave interaction efficiency by changing the coupling slot configuration has been proposed in the study of extended interaction oscillators (EIOs). The dispersion characteristics, coupling coefficient and interaction impedance of the high-frequency structure based on different types of coupling slots have been investigated. Four types of coupled cavity structures with different layouts of the coupling slots have been compared to improve the beamwave interaction efficiency, so as to analyze the beam-wave interaction and practical applications. In order to determine the improvement of the coupling slot to a coupled cavity circuit in an EIO, we designed four nine-gap EIOs based on the coupled cavity structure with different coupling slot configurations. With different operating frequencies and voltages takes into consideration, beam voltages from 27 to 33 kV have been simulated to achieve the best beam-wave interaction efficiency so that the EIOs are able to work in the 2π mode. The influence of the Rb and the ds on the output power is also taken into consideration. The Rb is the radius of the electron beam, and the ds is the width of the coupling slot. The simulation results indicate that a single-slot-type EIO has the best beam-wave interaction efficiency. Its maximum output power is 2.8 kW and the efficiency is 18% when the operating voltage is 31 kV and electric current is 0.5 A. The output powers of these four EIOs that were designed for comparison are not less than 1.7 kW. The improved coupling-slot configurations enables the extended interaction oscillator to meet the different engineering requirements better.

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Authors and Affiliations

  1. School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China

    Sairong Zhu, Yong Yin, Liangjie Bi, Zhiwei Chang, Che Xu, Fanbo Zeng, Ruibin Peng, Wen Zhou, Bin Wang, Hailong Li & Lin Meng

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  1. Sairong Zhu
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  2. Yong Yin
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  3. Liangjie Bi
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  4. Zhiwei Chang
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  5. Che Xu
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  6. Fanbo Zeng
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  10. Hailong Li
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  11. Lin Meng
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Correspondence to Yong Yin.

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Zhu, S., Yin, Y., Bi, L. et al. Improvement of the Beam-Wave Interaction Efficiency Based on the Coupling-Slot Configuration in an Extended Interaction Oscillator. J. Korean Phys. Soc. 73, 1362–1369 (2018). https://doi.org/10.3938/jkps.73.1362

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