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Asymmetric modes decomposition in an overmoded relativistic backward wave oscillator

机译：过调制相对论反向波振荡器中的非对称模式分解

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摘要

Most of the investigated overmoded relativistic backward wave oscillators (RBWOs) are azimuthally symmetric; thus, they are designed through two dimensional (2-D) particle-in-cell (PIC) simulations. However, 2-D PIC simulations cannot reveal the effect of asymmetric modes on beam-wave interaction. In order to investigate whether asymmetric mode competition needs to be considered in the design of overmoded RBWOs, a numerical method of determining the composition of both symmetric and asymmetric modes in three dimensional (3-D) PIC simulations is introduced in this paper. The 2-D and 3-D PIC simulation results of an X-band overmoded RBWO are analyzed. Our analysis indicates that the 2-D and 3-D PIC simulation results of our device are quite different due to asymmetric mode competition. In fact, asymmetric surface waves, especially EH11 mode, can lead to serious mode competition when electron beam propagates near the surface of slow wave structures (SWSs). Therefore, additional method of suppressing asymmetric mode competition, such as adjusting the reflections at both ends of SWSs to decrease the Q-factor of asymmetric modes, needs to be utilized in the design of overmoded RBWOs. Besides, 3-D PIC simulation and modes decomposition are essential for designing overmoded RBWOs. (C) 2014 AIP Publishing LLC.
机译：大多数研究过的相对论后向波振荡器（RBWO）都是方位对称的。因此，它们是通过二维（2-D）单元内粒子（PIC）模拟设计的。但是，二维PIC模拟不能揭示不对称模式对束波相互作用的影响。为了研究在过调制的RBWO的设计中是否需要考虑非对称模式竞争，本文介绍了一种在三维（3-D）PIC仿真中确定对称模式和非对称模式组成的数值方法。分析了X波段过调制的RBWO的2-D和3-D PIC仿真结果。我们的分析表明，由于不对称模式竞争，我们设备的2D和3D PIC仿真结果差异很大。实际上，当电子束在慢波结构（SWSs）的表面附近传播时，不对称的表面波，尤其是EH11模式，会导致严重的模式竞争。因此，在过调制的RBWO的设计中，需要利用其他抑制不对称模式竞争的方法，例如调整SWS两端的反射以降低不对称模式的Q因子。此外，3-D PIC仿真和模式分解对于设计过调制的RBWO至关重要。 （C）2014 AIP Publishing LLC。

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