Theory and New Amplification Regime in Periodic Multimodal Slow Wave Structures With Degeneracy Interacting With an Electron Beam
Theory and New Amplification Regime in Periodic Multimodal Slow Wave Structures With Degeneracy Interacting With an Electron Beam
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简并与电子束相互作用的周期性多模态慢波结构的理论和新放大机制
DOI：
10.1109/tps.2016.2538786
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发表时间：
2014
影响因子：
1.5
通讯作者：
F. Capolino
中科院分区：
文献类型：
--
作者：
M. Othman;V. A. Tamma;F. Capolino
我们提出了一种新的放大制度的行波管（TWT）的慢波周期性结构，支持多个电磁模式，都可以与电子束同步组成的理论。多模态慢波结构和电子束之间的相互作用被量化使用多传输线（MTL）的方法的基础上的广义皮尔斯模型和传输矩阵分析，导致识别模式与复杂的布洛赫波数。特别是，我们解决了一个新的可能的操作条件行波管的基础上的电子束和四个模式之间的超同步表现出的退化条件附近的周期性慢波MTL的带边。我们表现出一种现象学的变化，在带结构的周期MTL，我们观察到至少有两个增长模式的合作解决方案，而不是一个统一的MTL，与电子束相互作用，严格只有一个增长模式的解决方案。我们讨论的优点，使用这样的简并条件行波管，导致放大器制度，也非常低的启动束流在高功率振荡器的增益条件。
We present the theory of a new amplification regime in traveling wave tubes (TWTs) composed of a slow wave periodic structure that supports multiple electromagnetic modes that can all be synchronized with the electron beam. The interaction between the multimodal slow wave structure and the electron beam is quantified using a multi-transmission line (MTL) approach based on a generalized Pierce model and transfer matrix analysis, leading to the identification of modes with complex Bloch wavenumber. In particular, we address a new possible operation condition for TWTs based on the supersynchronism between an electron beam and four modes exhibiting a degeneracy condition near a band edge of the periodic slow wave MTL. We show a phenomenological change in the band structure of a periodic MTL, where we observe at least two growing modal cooperating solutions as opposed to a uniform MTL, interacting with an electron beam where there is rigorously only one growing modal solution. We discuss the advantage of using such a degeneracy condition in TWTs that leads to larger gain conditions in amplifier regimes and also to very low starting beam current in high-power oscillators.