Investigation of an X-band magnetically insulated transmission line oscillator |
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Authors: | Fan Yu-Wei Zhong Hui-Huang Li Zhi-Qiang Shu Ting Yang Han-Wu Yang Jian-Hu Wang Yong Luo Ling and Zhao Yan-Song |
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Institution: | College of Optoelectrical Science and Technology, National
University of Defense Technology, Changsha 410073, China |
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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. |
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Keywords: | magnetically insulated
transmission line oscillator (MILO) high-power microwaves (HPM) pulse shortening |
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