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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >A high power radial Ka-band transit time oscillator with nonuniform extractor
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A high power radial Ka-band transit time oscillator with nonuniform extractor

机译：具有非均匀提取器的高功率径向KA波段传输时间振荡器

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摘要

The radial transit time oscillator is promising to realize high power output of millimeter-waves. However, the enhancement of the electric field in extractor and the microwave extraction are two main problems to be overcome. A high power radial Ka-band transit time oscillator is proposed in the paper. Increasing the third gap by integer multiples of half the wavelength, the nonuniform extractor will be introduced. In the extractor, the radial mode of the electric field in the modified extractor is the same as that in the uniform extractor. Due to volume increase of the beam-wave interaction region, this structure can improve power capacity to a certain degree. In particle-in-cell simulation, the proposed radial Ka-band oscillator can output high power microwave with the power of 1.0 GW, the frequency of 31.3 GHz and the efficiency of 33%. Besides, the modified structure can decrease the maximum radial electric field in extractor to 0.9 MV cm(-1). As the diode voltage ranges from 350 to 450 kV, efficiency of the oscillator is larger than 20% and the center frequency will not change, which proves the steady operation of this device. To realize high output power, the materials with high conductivity need to be employed, such as copper and aluminum. Besides, the microwave channel goes through the inner space of the high current coils, this design can decrease the number of the support posts to 50 and increase the bandwidth where the transmission efficiency is larger than 99% to be over 1.8 GHz.
机译：径向传输时间振荡器是有希望实现毫米波的高功率输出。然而，提取器中的电场和微波提取的增强是要克服的两个主要问题。本文提出了一种高功率径向KA带传输时间振荡器。通过整数倍数增加了第三间隙的一半波长，将引入非均匀的提取器。在提取器中，改进的提取器中的电场的径向模式与均匀提取器中的电场相同。由于光波相互作用区域的体积增加，该结构可以提高功率容量到一定程度。在粒子内仿真中，所提出的径向KA波段振荡器可以输出高功率微波，功率为1.0 GW，频率为31.3 GHz，效率为33％。此外，改进的结构可以减小提取器中的最大径向电场至0.9mVcm（-1）。由于二极管电压范围为350至450 kV，振荡器的效率大于20％，中心频率不会改变，这证明了该装置的稳定运行。为了实现高输出功率，需要采用高导电率的材料，例如铜和铝。此外，微波通道通过高电流线圈的内部空间，这种设计可以将支撑柱的数量减少到50，并增加传输效率大于99％的带宽，以超过1.8GHz。

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