Nonlinear simulation of multiple modes interaction with relativistic electron beam in THz cyclotron autoresonance maser
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摘要: 为了有效分析模式竞争，建立了回旋自谐振脉塞（CARM）多模束波互作用自洽非线性理论模型，并具体模拟研究了工作模式为TM51、频率为0.35 THz的高阶横磁模CARM中大轨道相对论电子束与多电磁模式的互作用过程。模拟结果表明：与回旋管不同，THz频段CARM可以有效工作于高阶TM模式，且具有较高的输出功率和增益；通过对工作参数的优化，可使工作模式的功率增长具有绝对优势，而竞争模式得到有效抑制；高阶TM模式THz频段CARM的性能对工作参数的变化十分敏感，在参数设计过程中必须对其进行多模束波互作用模拟分析。Abstract: A nonlinear description via the self-consistent coupling equations of waves with relativistic electron beam, is provided for the nonlinear interaction of multiple modes with the relativistic electron beam in cyclotron autoresonance maser(CARM), to analyze the mode competition in CARM. Specific analysis of a sub-terahertz (0.35 THz) CARM with higher-order mode TM51 and a large-orbit electron beam shows that, contrasted with, both larger output power and higher gain can be achieved for a CARM with TM operating mode. By optimizing parameters, the operating mode can play an absolutely dominant role while the competing modes are efficiently suppressed. However, a multi-mode nonlinear simulation must be performed for a higher-order terahertz CARM, because the output power is quite sensitive to the operating parameters.
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Key words:
- cyclotron autoresonance maser /
- multi-mode /
- relativistic electron beam /
- nonlinear interaction /
- terahertz /
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