中国物理B ›› 2008, Vol. 17 ›› Issue (5): 1804-1808.doi: 10.1088/1674-1056/17/5/042

• CLASSICAL AREAS OF PHENOMENOLOGY • 上一篇    下一篇

Investigation of an X-band magnetically insulated transmission line oscillator

樊玉伟, 钟辉煌, 李志强, 舒 挺, 杨汉武, 杨建华, 王 勇, 罗 玲, 赵延宋   

  1. College of Optoelectrical Science and Technology, National University of Defense Technology, Changsha 410073, China
  • 收稿日期:2007-07-15 修回日期:2007-08-16 出版日期:2008-05-20 发布日期:2008-05-20
  • 基金资助:
    Project supported by the Chinese National Natural Science Foundation (Grant No 10675168), and Innovation Fund of Graduate School of the National University of Defense Technology of China.

Investigation of an X-band magnetically insulated transmission line oscillator

Fan Yu-Wei(樊玉伟)†, Zhong Hui-Huang(钟辉煌), Li Zhi-Qiang(李志强), Shu Ting(舒挺), Yang Han-Wu(杨汉武), Yang Jian-Hua(杨建华), Wang Yong(王勇), Luo Ling(罗玲), and Zhao Yan-Song(赵延宋)   

  1. College of Optoelectrical Science and Technology, National University of Defense Technology, Changsha 410073, China
  • Received:2007-07-15 Revised:2007-08-16 Online:2008-05-20 Published:2008-05-20
  • Supported by:
    Project supported by the Chinese National Natural Science Foundation (Grant No 10675168), and Innovation Fund of Graduate School of the National University of Defense Technology of China.

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摘要： An X-band magnetically insulated transmission line oscillator (MILO) is designed and investigated numerically and experimentally for the first time. The X-band MILO is optimized in detail with KARAT code. In simulation, the X-band MILO, driven by a 720kV, 53kA electron beam, comes to a nonlinear steady state in 4.0ns. High-power microwaves (HPM) of TEM mode is generated with an average power of 4.1GW, a frequency of 9.3GHz, and power conversion efficiency of 10.8% in durations of 0--40ns. The device is fabricated according to the simulation results. In experiments, when the voltage is 400kV and the current is 50kA, the radiated microwave power reaches about 110MW and the dominating frequency is 9.7GHz. Because the surfaces of the cathode end and the beam dump are destroyed, the diode voltage cannot increase continuously. However, when the diode voltage is 400kV, the average power output is obtained to be 700MW in simulation. The impedance of the device is clearly smaller than the simulation prediction. Moreover, the duration of the microwave pulse is obviously shorter than that of the current pulse. The experimental results are greatly different from the simulation predictions. The preliminary analyses show that the generations of the anode plasma, the cathode flare and the anode flare are the essential cause for the remarkable deviation of the experimental results from the simulation predictions.

Abstract: An X-band magnetically insulated transmission line oscillator (MILO) is designed and investigated numerically and experimentally for the first time. The X-band MILO is optimized in detail with KARAT code. In simulation, the X-band MILO, driven by a 720kV, 53kA electron beam, comes to a nonlinear steady state in 4.0ns. High-power microwaves (HPM) of TEM mode is generated with an average power of 4.1GW, a frequency of 9.3GHz, and power conversion efficiency of 10.8% in durations of 0--40ns. The device is fabricated according to the simulation results. In experiments, when the voltage is 400kV and the current is 50kA, the radiated microwave power reaches about 110MW and the dominating frequency is 9.7GHz. Because the surfaces of the cathode end and the beam dump are destroyed, the diode voltage cannot increase continuously. However, when the diode voltage is 400kV, the average power output is obtained to be 700MW in simulation. The impedance of the device is clearly smaller than the simulation prediction. Moreover, the duration of the microwave pulse is obviously shorter than that of the current pulse. The experimental results are greatly different from the simulation predictions. The preliminary analyses show that the generations of the anode plasma, the cathode flare and the anode flare are the essential cause for the remarkable deviation of the experimental results from the simulation predictions.

Key words: magnetically insulated transmission line oscillator (MILO), high-power microwaves (HPM), pulse shortening

中图分类号:  (Waveguides, transmission lines, striplines)

  • 84.40.Az
52.50.-b (Plasma production and heating)