Superimposed-harmonic Smith-Purcell free-electron lasers driven by periodic electron-bunches

Superimposed-harmonic Smith-Purcell free-electron lasers driven by periodic electron-bunches
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由周期性电子束驱动的叠加谐波史密斯-珀塞尔自由电子激光器

DOI:
10.1063/1.5064865
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发表时间:
2019-01
期刊:
影响因子:
2.2
通讯作者:
Lu Yalin
Lu Yalin
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Liang Linbo;Liu Weihao;Jia Qika;Wang Lin;Lu Yalin

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针对高功率、宽调谐太赫兹光源的要求,提出并研究了一种改进的周期性电子束团驱动的Smith-Purcell自由电子激光器(SP-FEL)。我们首先设计了一个带有光电阴极的电子枪,它产生了一系列宏观聚束频率可调的PEB。然后,这些PEB与光栅上的表面波相互作用,并进一步微聚束。将宏观聚束频率及其谐波叠加在微观聚束频率上,从而在叠加的谐波处实现多色超辐射Smith-Purcell辐射。通过调节宏观聚束频率,超辐射频率可以在0.5 ~ 1 THz范围内调谐,这是常规SP-FEL和真空电子器件难以达到的。与直流束相比,PEB具有更高的峰值电流密度并产生更高的峰值功率。因此,所提出的方案可以很有希望地发展为高功率和宽调谐太赫兹源。
To meet the requirements of high power and broad-tunable terahertz sources, we proposed and investigated a modified Smith-Purcell free-electron laser (SP-FEL) driven by periodic electron-bunches (PEBs). We first designed an electron-gun with a photocathode, which generates a train of PEBs with tunable macro-bunching frequency. These PEBs then interact with surface waves on a grating and are further micro-bunched. The macro-bunching frequency together with its harmonics is superimposed on the micro-bunching one such that the multi-color superradiant Smith-Purcell radiation is achieved at the superimposed harmonics. By adjusting the macro-bunching frequency, the superradiant frequency can be tuned from 0.5 to 1 THz—a region hard to reach by conventional SP-FELs and vacuum electron devices. Compared to DC-beams, the PEBs have higher peak current density and generate higher peak power. Thus, the proposed scheme can be promisingly developed as high power and broad-tunable terahertz sources.
Smith-Purcell 自由电子激光器的增长率和启动电流
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