Absolute and global instabilities driven by Cherenkov interaction between magnetized electron beam and spoof surface plasmon polaritons
Absolute and global instabilities driven by Cherenkov interaction between magnetized electron beam and spoof surface plasmon polaritons
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DOI：
10.1063/5.0139713
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发表时间：
2023-04
影响因子：
2.2
通讯作者：
Y. Annaka;K. Ogura;M. Ito
中科院分区：
文献类型：
--
作者：
Y. Annaka;K. Ogura;M. Ito
在这项研究中，我们研究了由磁化电子束和具有方位角模数m的欺骗表面等离子激元（SPPs）之间的切伦科夫相互作用驱动的绝对不稳定性和全局不稳定性。绝对不稳定性和全局不稳定性分别在长和短长度的圆柱形波纹波导（ccw）中引起。时空增长率具有不同的主导模式，分别影响绝对不稳定性和全球不稳定性。在实验中，观测到的g波段辐射对应于空间增长率的主导模式，其长度较短。在长CCW中，由于时间增长速率的主导模式频率低于探测系统的g波段截止频率，g波段辐射消失。研究结果表明，光波的不稳定性和多模辐射随光波长度的变化而变化。
In this study, we examine absolute and global instabilities driven by the Cherenkov interaction between a magnetized electron beam and spoof surface plasmon polaritons (SPPs) with an azimuthal mode number m. The absolute and global instabilities are induced in long and short lengths of the cylindrical corrugated waveguides (CCWs), respectively. The temporal and spatial growth rates have different dominant modes of spoof SPPs that, respectively, affect the absolute and global instabilities. In the experiment, the G-band radiation, which corresponds to the dominant mode in the spatial growth rate, is observed with the short length CCW. In the long CCW, the G-band radiation vanishes because the dominant mode in the temporal growth rate has lower frequency than the G-band cutoff frequency of the detecting system. Our results demonstrate that the instability and the multimode radiation are changed by the length of the CCW.