420GHz大功率二次谐波准光回旋振荡器
首发时间:2016-05-12
摘要:回旋管是一种重要的大功率太赫兹辐射源,为了降低太赫兹回旋管的工作磁场,本文研究了一种采用共焦柱面谐振腔的准光回旋管。这种准光谐振腔结合了传统回旋管开放式谐振腔与光学谐振腔两者的特色, 具有很好的模式选择性,有助于抑制高次谐波回旋管中的模式竞争,实现大功率谐波输出。通过理论分析,研究了共焦柱面准光回旋管二次谐波工作的优选模式。在此基础上,设计了一只大功率420GHz准光腔二次谐波回旋管,工作模式为准光TE0,11模式。采用时域多模注波互作用理论方法对谐振腔的工作参数进行了优化,选取工作电压60kV,工作电流6A,工作磁场8.21Tesla,并采用三维粒子模拟进行了仿真验证。理论计算与粒子模拟结果表明,设计的420GHz准光腔回旋管有望获得60kW以上的输出功率。为其设计了低速度离散的双阳极磁控注入式电子枪,电子注速度横纵比1.1,速度零散2.2%。
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A 420 GHz high-power second harmonic quasi-optical gyrotron based on confocal cavity
Abstract:Gyrotrons are important high power terahertz radiation sources. To reduce the operation magnet for terahertz gyrotron, a quasi-optical gyrotron with confocal cavity is investigated. The confocal cavity is combined with conventional cylindrical cavity and optical cavity, and has good mode selection to reduce mode competition. Thus, it is potential to generate high power harmonic radiation. Optimum operation mode for second harmonic gyrotron is investigated by theoretical analysis. Then, a high power 420GHz second harmonic quasi-optical gyrotron is designed, which operation mode is TE0,11. The operation parameters were 60kV, 6A and 8.21Tesla which optimized by time-dependent multimode interaction theory, and verified by three dimension particle-in-cell (3D-PIC) simulations. The results from theoretical analysis and PIC simulations both show that, the design gyrotron can produce more than 60kW second harmonic output power. A low velocity spread triode magnetron injection gun (MIG) is also presented, which has an average perpendicular-to-parallel velocity ratio 1.1 and perpendicular parallel velocity spread of 2.2%.
Keywords: Gyrotron second harmonic confocal quasi-optical cavity
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