Observation of dynamic interactions between fundamental and second-harmonic modes in a high-power sub-terahertz gyrotron operating in regimes of soft and hard self-excitation.
Observation of dynamic interactions between fundamental and second-harmonic modes in a high-power sub-terahertz gyrotron operating in regimes of soft and hard self-excitation.
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DOI：
10.1103/physrevlett.109.155001
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发表时间：
2012-10
影响因子：
8.6
通讯作者：
T. Saito;Y. Tatematsu;Y. Yamaguchi;S. Ikeuchi;S. Ogasawara;N. Yamada;R. Ikeda;I. Ogawa;T. Idehara
中科院分区：
文献类型：
--
作者：
T. Saito;Y. Tatematsu;Y. Yamaguchi;S. Ikeuchi;S. Ogasawara;N. Yamada;R. Ikeda;I. Ogawa;T. Idehara
在高功率亚太赫兹回旋管中观察到了基模和二次谐波模之间的动态模相互作用[T。Notake等人，物理修订信函103，225002（2009）; T. Saito等人，Phys. Plasmas 19，063106（2012）]。相互作用发生在寄生基波或一次谐波（FH）模式和工作二次谐波（SH）模式之间，以及SH模式之间。特别是，寄生FH模式的非线性激励在硬自激制度的SH模式的协助下，在软自激制度，清楚地观察到。此外，两种情况下，稳定的双模振荡和振荡的FH模式只被观察到。这些观测和对模式相互作用动力学行为的理论分析证实了FH模式的非线性硬自激。
Dynamic mode interaction between fundamental and second-harmonic modes has been observed in high-power sub-terahertz gyrotrons [T. Notake et al., Phys. Rev. Lett. 103, 225002 (2009); T. Saito et al. Phys. Plasmas 19, 063106 (2012)]. Interaction takes place between a parasitic fundamental or first-harmonic (FH) mode and an operating second-harmonic (SH) mode, as well as among SH modes. In particular, nonlinear excitation of the parasitic FH mode in the hard self-excitation regime with assistance of a SH mode in the soft self-excitation regime was clearly observed. Moreover, both cases of stable two-mode oscillation and oscillation of the FH mode only were observed. These observations and theoretical analyses of the dynamic behavior of the mode interaction verify the nonlinear hard self-excitation of the FH mode.