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本文报道了近期衍射输出相对论磁控管在低电压、短脉冲、高重复频率条件下的初步实验研究结果。当外加电压约180k V,磁场约0.12T时,输出微波功率最高可达120MW,微波频率2.3GHz,功率效率22%。在半高宽约7ns,平顶约2.5ns的电脉冲条件下,输出微波底宽3ns,半高宽1.5ns。当器件以50Hz和100Hz高重复频率运行时,输出微波幅值稳定性受电脉冲波动和通电螺线管内的电流波动影响较大,微波功率波动范围90MW至120MW。以脉冲串的形式、长时间高重频运行20000炮次后,器件内部无明显的烧蚀出现。
This paper reports the results of a preliminary experimental study of relativistic magnetrons with low-voltage, short-pulse and high repetition rates. When the applied voltage is about 180k V and the magnetic field is about 0.12T, the output microwave power is up to 120MW, the microwave frequency is 2.3GHz and the power efficiency is 22%. Under the conditions of electric pulse of about 7ns FWHM and flat top about 2.5ns, the output microwave has 3ns bottom width and 1.5ns FWHM. When the device operates at high repetition rates of 50Hz and 100Hz, the stability of the output microwave amplitude is greatly affected by fluctuations of the electrical pulse and the current fluctuations in the energized solenoid. The power fluctuation range of the microwave power is 90MW to 120MW. In the form of bursts, after a long period of high repetition frequency operation 20,000 shots, there is no obvious ablation inside the device.