Research progresses on Cherenkov and transit-time high-power microwave sources at NUDT

Zhang, Jiande; Ge, Xingjun; Zhang, Jun; He, Juntao; Yang, Fan; Li, Zhiqiang; Jin, Zhenxing; Gao, Liang; Ling, Junpu; Qi, Zumin

doi:10.1016/j.mre.2016.04.001

Cited by 67 publications

(16 citation statements)

References 42 publications

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“…ue to their excellent features such as high-voltage, highcurrent, low inductance, and high di/dt rate, spark gap switches are widely used in various practical applications such as particle accelerators, weapon effect simulation, controlled thermonuclear fusion, high-power lasers, and high-power microwaves [1]. Recent developments in the design of repetitive pulsed power sources require spark gap switches capable of driving high-current with a low time-delay jitter (< 5 ns) and operated at a high repetition rate (~100 Hz) for a very large number of shots [2][3][4][5][6]. The low time-delay jitter characteristics at a high value of repetition frequency is a critical parameter, in Falun Song, Fei Li, Beizhen Zhang, Chunxia Li, Ganping Wang, Haitao Gong, Yanqing Gan and Xiao Jin, are with Science and Technology on High Power Microwave Laboratory, Institute of Applied Electronics, China Academy of Engineering Physics, Mianyang 621900, China (email: songfalun@caep.cn; shanxilifei@163.com; 99477228@qq.com; lichunxia@tsinghua.org.cn;…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Optimal Operation Frequency With Lowest Time-Delay Jitter for an Electrically Triggered Field-Distortion Spark Gap

Song

Zhang

et al. 2019

IEEE Trans. Plasma Sci.

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The present work was stimulated by the assumption that, for a gas-filled spark gap closing switch operating at a high repetition frequency, there is an optimal frequency range in which the time-delay jitter is reaching a minimum value. The experiments to test this assumption use an electrically triggered, fielddistortion spark gap filled with SF6/N2 gas mixture. The results show that indeed, the time-delay jitter decreases for a range of frequencies for which the filling gas can substantially restore the inter-electrode insulation, before increasing at a higher operation frequency. The experimental results demonstrate the correctness of the above presented assumption: the time-delay jitter of the field-distortion spark gap has its minimum when the unit operates in the repetition frequency range between 20 Hz and 30 Hz. Since the recovery time depends on gas species and gap distance, the optimum operation frequency range should also vary depending on the spark gap distance and the filling gas properties. Index Terms-optimal repetition frequency, low time-delay jitter, field distortion, spark gap switch Ivor R. Smith received the B.Sc. and Ph.D. degrees from the University of Bristol, Bristol, U.K., after completing a student apprenticeship at the Witton Works of the General Electric Company, and the D.Sc. degree from the University of Birmingham, Birmingham, U.K., for his continued research contribution. He was a Lecturer in electrical engineering with the University of Birmingham and was subsequently promoted to Lecturer and Reader. He then moved to Loughborough University, Leicestershire, U.K., as a Professor of electrical power engineering and served as the Head of Department, Dean of Engineering, and Pro-Vice Chancellor. He has been active in research in many aspects of the production, conditioning, and utilization of large pulses of electrical energy, and his work has brought in very substantial funding from a wide range of sponsors. Dr. Smith is a Chartered Engineer, a Fellow of the Institution of Engineering and Technology and the Royal Academy of Engineering.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Optimal Operation Frequency With Lowest Time-Delay Jitter for an Electrically Triggered Field-Distortion Spark Gap

Song

Zhang

et al. 2019

IEEE Trans. Plasma Sci.

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“…10 illustrates that increasing the electron beam radius effectively reduces the electric field strength in the output cavity. Zhang et al found that the breakdown threshold can reach 2.5 MV/cm by treating the slow wave structure surface [21]. The electric field intensity is lower than the breakdown threshold which means that it can be tolerated.…”

Section: Simulation Results and Discussionmentioning

confidence: 99%

Oversized coaxial output cavity for Ka band relativistic klystron

Duan

Huang

et al. 2018

J. eng.

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“…Considering the available sources in our lab and the difficulties of manufacturing and experiment operations [18], a combined dual-bend converter shown in Fig. 8 is designed at 8.84 GHz to verify the above-mentioned analysis and design.…”

Section: Methodsmentioning

confidence: 99%

Analysis and design of TEM-TE₁₁ coaxial waveguide bend mode converters

Zhang

Zhao

Yuan

et al. 2019

Int. J. Microw. Wireless Technol.

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Two coaxial waveguide bend mode converters that transform coaxial transverse electromagnetic mode to TE11 coaxial waveguide mode are presented in this paper. Both converters are designed and optimized on the basis of the strictly derived mode coupling coefficients. Conversion efficiencies of both converters are over 99% and the power-handling capacities reach a gigawatt level. The combined dual-bend mode converter is fabricated and tested. The experimental results coincide well with the theoretical calculations and simulations, which demonstrates the feasibility of the designed converter.

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Research progresses on Cherenkov and transit-time high-power microwave sources at NUDT

Cited by 67 publications

References 42 publications

Analysis of the Optimal Operation Frequency With Lowest Time-Delay Jitter for an Electrically Triggered Field-Distortion Spark Gap

Analysis of the Optimal Operation Frequency With Lowest Time-Delay Jitter for an Electrically Triggered Field-Distortion Spark Gap

Oversized coaxial output cavity for Ka band relativistic klystron

Analysis and design of TEM-TE₁₁ coaxial waveguide bend mode converters

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Research progresses on Cherenkov and transit-time high-power microwave sources at NUDT

Cited by 67 publications

References 42 publications

Analysis of the Optimal Operation Frequency With Lowest Time-Delay Jitter for an Electrically Triggered Field-Distortion Spark Gap

Analysis of the Optimal Operation Frequency With Lowest Time-Delay Jitter for an Electrically Triggered Field-Distortion Spark Gap

Oversized coaxial output cavity for Ka band relativistic klystron

Analysis and design of TEM-TE11 coaxial waveguide bend mode converters

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Product

Resources

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Analysis and design of TEM-TE₁₁ coaxial waveguide bend mode converters