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首页> 外文期刊>Physica Scripta: An International Journal for Experimental and Theoretical Physics >Effect of beam thermal spread on BWO (backward wave oscillator) interaction
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Effect of beam thermal spread on BWO (backward wave oscillator) interaction

机译：光束热扩散对BWO（后向波振荡器）相互作用的影响

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An important issue in the generation of coherent radiation at short wavelengths from Backward Wave Oscillators (BWOs) is the effect of a beam thermal spread on the BWO interaction. The effect of energy spread on the gain in high power microwave devices has been a topic of many investigations [1,2]. It is equally important to discuss the effect of thermal spread on BWO instability. The electron beam is assumed to be monoenergetic with a pitch angle spread, and is described by the inclusion of nonvanishing canonical momenta by means of a Gaussian distribution. For a sufficient thermal electron distribution, however, it is possible for the longitudinal energy spread to become large enough so as to reduce the resonant interaction between the slow wave and the electron. The thermal electron interaction regime corresponds to a weak instability in which the growth rate and hence the gain of the slow wave is greatly reduced. It is possible to estimate how large thermal electron velocity spread can be treated before the resonant wave-particle interaction is degraded. Our purpose in this paper are used to discuss the effects of a finite spread in the beam axial momentum on the BWO instability and frequency of electromagnetic wave generation. [References: 5]
机译：从反向波振荡器（BWO）产生短波长相干辐射中的一个重要问题是光束热扩散对BWO相互作用的影响。能量传播对高功率微波设备增益的影响已成为许多研究的主题[1,2]。讨论热扩散对BWO不稳定性的影响同样重要。假定电子束是具有俯仰角扩展的单能电子束，并且通过借助高斯分布包含不消失的正则矩来描述。但是，为了获得足够的热电子分布，纵向能量分布可能会变得足够大，从而减少慢波与电子之间的共振相互作用。热电子相互作用机制对应于微弱的不稳定性，其中，增长率和慢波的增益大大降低。可以估计在共振波-粒子相互作用降低之前可以处理多大的热电子速度扩展。本文的目的是讨论束轴向动量有限扩展对电磁波产生的BWO不稳定性和频率的影响。 [参考：5]

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