On the Possibility of Controlling the Second Harmonic Radiation of the Free Electron Laser Using the Second Harmonic of the Undulator Field

IF 1 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY

Journal of Experimental and Theoretical Physics Pub Date : 2023-10-26 DOI:10.1134/S1063776123090078

K. V. Zhukovsky

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Abstract

The second harmonic radiation of a single-pass free electron laser (FEL) and its dependence on the second harmonic of the undulator field are investigated. In analysis of properties of materials, the nonlinear generation of the second harmonic as a response to radiation is an important effect. In this context, the second harmonic generation of the radiation source (FEL) is undesirable since it masks the signal being analyzed. Conversely, in other cases, the second harmonic radiation of the FEL can be useful as radiation with a higher frequency. We investigate the possibility of suppression (or, conversely, enhancement) of the FEL second harmonic power depending on the phase and strength of the second harmonic of the FEL undulator field. The proposed approach is independent in principle of the radiation frequency. We consider examples of LCLS and PAL-XFEL in the X-ray range and SPARC and LEUTL in the visible range. The more effective influence of the undulator field harmonic in operation with narrow electron beams is demonstrated.

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利用波动场的二次谐波控制自由电子激光器二次谐波辐射的可能性

研究了单程自由电子激光器的二次谐波辐射及其与波荡场二次谐波的关系。在材料性能分析中，作为辐射响应的二次谐波的非线性产生是一个重要影响。在这种情况下，辐射源（FEL）的二次谐波产生是不希望的，因为它掩盖了被分析的信号。相反，在其他情况下，FEL的二次谐波辐射可以用作具有更高频率的辐射。我们研究了根据自由电子激光波荡器场的二次谐波的相位和强度来抑制（或相反地，增强）自由电子激光二次谐波功率的可能性。所提出的方法在原理上与辐射频率无关。我们考虑了在X射线范围内的LCLS和PAL-XFEL以及在可见光范围内的SPARC和LEUTL的例子。证明了在窄电子束工作时波荡器场谐波的更有效影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Experimental and Theoretical Physics 物理-物理：综合

CiteScore

1.90

自引率

9.10%

发文量

130

审稿时长

3-6 weeks

期刊介绍： Journal of Experimental and Theoretical Physics is one of the most influential physics research journals. Originally based on Russia, this international journal now welcomes manuscripts from all countries in the English or Russian language. It publishes original papers on fundamental theoretical and experimental research in all fields of physics: from solids and liquids to elementary particles and astrophysics.