Theoretical Analysis of the Radiation Properties of Some Major X-Ray Free Electron Lasers,Annalen Der Physik

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Theoretical Analysis of the Radiation Properties of Some Major X-Ray Free Electron Lasers
Annalen Der Physik ( IF 2.2 ) Pub Date : 2021-09-16 , DOI: 10.1002/andp.202100091
Konstantin Zhukovsky ₁

Affiliation

A theoretical analysis of the radiation in X-ray free electron lasers (FELs) LCLS, PAL-XFEL, SwissFEL, as well as SACLA, FLASH 2, and European XFEL is presented. Major losses in FELs are analytically accounted for and analyzed, using exact expressions for the Bessel factors in terms of the generalized Bessel functions. This allows distinguishing the contributions of key parameters and accounting for the losses individually for each harmonic, considering higher sensitivity of the electron-photon interaction at higher harmonic wavelengths. The harmonic power evolution along FELs and the spectral width of the radiation lines is studied. The theoretical results are analyzed and are compared with the available experimental data for the FEL experiments. The harmonic generation and amplification in the FELs are modeled and studied with the harmonic lasing self-seed (HLSS) with separate buncher and radiator, and the results are compared with those for SASE. The spectral properties of the radiation are analytically calculated and compared with the measured spectral characteristics. The advantages of HLSS versus SASE FEL are elucidated in the examples of FLASH2, European XFEL, and SwissFEL. The prospected radiation properties of LCLS-II FEL are analyzed and the possibilities of using harmonics in this FEL are proposed.

中文翻译：

几种主要X射线自由电子激光器辐射特性的理论分析

对 X 射线自由电子激光器 (FEL) LCLS、PAL-XFEL、SwissFEL 以及 SACLA、FLASH 2 和欧洲 XFEL 中的辐射进行了理论分析。FEL 中的主要损失进行了分析说明和分析，根据广义 Bessel 函数使用 Bessel 因子的精确表达式。考虑到电子-光子相互作用在高次谐波波长下的更高灵敏度，这允许区分关键参数的贡献并单独考虑每个谐波的损耗。研究了沿 FEL 的谐波功率演化和辐射线的谱宽。对理论结果进行了分析，并与 FEL 实验的可用实验数据进行了比较。FEL 中的谐波生成和放大使用具有单独聚束器和辐射器的谐波激光自种子 (HLSS) 进行建模和研究，并将结果与 SASE 的结果进行比较。辐射的光谱特性被分析计算并与测量的光谱特性进行比较。FLASH2、欧洲XFEL 和SwissFEL 的示例阐明了HLSS 与SASE FEL 的优势。分析了 LCLS-II FEL 的预期辐射特性，并提出了在该 FEL 中使用谐波的可能性。FLASH2、欧洲XFEL 和SwissFEL 的示例阐明了HLSS 与SASE FEL 的优势。分析了 LCLS-II FEL 的预期辐射特性，并提出了在该 FEL 中使用谐波的可能性。FLASH2、欧洲XFEL 和SwissFEL 的示例阐明了HLSS 与SASE FEL 的优势。分析了 LCLS-II FEL 的预期辐射特性，并提出了在该 FEL 中使用谐波的可能性。

更新日期：2021-11-16

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