Analysis and Simulation of a Gigawatt-Class Ka-Band Radial Transit Time Oscillator
Analysis and Simulation of a Gigawatt-Class Ka-Band Radial Transit Time Oscillator
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DOI：
10.1109/ted.2019.2918099
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发表时间：
2019-07
影响因子：
3.1
通讯作者：
Haitao Wang;Jun Zhang;Fangchao Dang;B. Qian
中科院分区：
文献类型：
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作者：
Haitao Wang;Jun Zhang;Fangchao Dang;B. Qian
获得高功率毫米波输出是高功率微波技术的研究热点。针对轴向毫米波发生器功率容量有限和模式竞争的特点，提出了一种输出高功率毫米波的径向器件。提出了一种千兆瓦波段的径向渡越时间振荡器(RTTO)。在引导0.8T的磁场时，采用径向TM01模式作为工作模式。PIC模拟结果表明，当二极管电压为400kV，束流为7.5kA时，获得了输出功率为1.1GW、转换效率约为37%、频率为31.2 GHz的HPMS。最大径向电场为1.2 mV/cm，证明了径向结构是提高功率容量的有效途径。三维PIC模拟证明，不存在角度非对称模相交。参数灵敏度分析表明，在一定范围内，电子束厚度和轴向位置偏移量不会影响RTTO的性能。此外，当径向引导磁场从0.6~6.0T变化时，振荡器可以稳定地工作，利用这些特性，RTTO有可能输出${ka}波段HPMS。
Obtaining high power millimeter-wave output is a research hotspot of high power microwave (HPM) technology. Considering limited power capacity and mode competition in axial millimeter wave generators, the radial device is introduced to output high power millimeter waves. A gigawatt-class ${Ka}$ -band radial transit time oscillator (RTTO) is proposed in this paper. In guiding the magnetic field of 0.8 T, the radial TM01 mode is applied as the operation mode. Particle-in-cell (PIC) simulation demonstrates that when the diode voltage is 400 kV and the beam current is 7.5 kA, the HPMs at 31.2 GHz with an output power of 1.1 GW and a conversion efficiency of about 37% are generated. The maximum radial electric field is 1.2 MV/cm, proving that the radial structure is an effective way to enhance power capacity. 3-D PIC simulation proves there is no angular nonasymmetric mode intersection. Analysis of parameter sensitivity shows that, within a certain range, the thickness and axial position offset of the electron beam will not influence the performance of the RTTO. In addition, the oscillator can operate steadily as the radial guiding magnetic field changes from 0.6 to 6.0 T. With these characteristics, the RTTO is potential to output ${Ka}$ -band HPMs.