太赫兹二次谐波回旋振荡器时域多模分析*
投稿时间:2018-11-21  修订日期:2019-07-17  点此下载全文
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作者单位E-mail
王雪微 中国科学院电子学研究所 wxwuestc@163.com 
薛谦忠 中国科学院高功率微波源与技术国防重点实验室中国科学院大学电子电气与通信工程学院 qianzhong_xue@mail.ie.ac.cn 
张珊 中国科学院高功率微波源与技术国防重点实验室
中国科学院大学电子电气与通信工程学院 
 
赵国慧 中国科学院高功率微波源与技术国防重点实验室中国科学院大学电子电气与通信工程学院  
刘高峰 中国科学院高功率微波源与技术国防重点实验室中国科学院大学电子电气与通信工程学院  
基金项目:国家自然科学基金(11475182)
中文摘要:高频率中等功率回旋管通常工作在谐波下来降低对磁场强度要求。然而,工作在高次谐波的回旋管面临低注波互作用效率和模式竞争问题。对起振电流计算可找到模式固有振荡区域,从而进行线性模式选择。当起振模式的幅度增长到一定值时,不同模式间会产生渗透效应,即有模式互作用产生,已起振的模式会协助或抑制其他模式起振。为观察非线性阶段的模式互作用现象,需进行时域多模计算。根据起振电流确定合适工作点,并基于频域单模稳态和时域多模理论进行模拟仿真。当工作电压为15 kV,工作磁场为7.185 T,工作电流为0.25 A时,在频域单模稳态计算中TE261-不能起振,工作模式TE261+达到稳定振荡;时域多模仿真结果显示TE261+和TE261-均能在393.87 GHz稳定振荡,TE261+在最终振荡中占主导地位,其输出功率和效率分别为136.8 W、3.6% ,两者获得的工作模式的输出特性完全吻合。
中文关键词:起振电流  谐波  太赫兹  时域多模计算
 
Multimode Time Domain Analysis of Terahertz Second Harmonic Cyclotron Oscillator *
Abstract:Medium-power gyrotron operating in high frequency usually works at harmonics to reduce the required magnetic field strength. However, high harmonic modes suffer from low beam-wave interaction efficiency and from additional competition with neighboring fundamental modes. Start currents provide self-excitation conditions for the only operating mode, which can be referred to the methods providing the linear selection of modes. However, as the amplitude of modes grow they may cause some saturation effects, e.g. mode interaction. In order to observe the interaction phenomenon in the nonlinear stage, multimode computation in time domain is needed. In this paper, the suitable operating point is determined according to the start current. Hot cavity simulation is carried out based on both frequency domain single mode theory and time domain multimode theory. The gyrotron reached a steady state where both TE261+ and TE261- modes oscillate at 393.87GHz in time domain theory while TE261- cannot oscillate in frequency domain theory when the beam voltage is15kV,the magnetic field is 7.185 T, and beam current is 0.25A. TE261+ mode dominated the final oscillation, which output power and efficiency are 136.8W and3.6%, respectively. The output characteristics of the operating mode obtained by the two theories are identical.
keywords:starting current, harmonics, THz, multimode btime domain calculation
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