Generation of Coherent X-ray Harmonic Radiation in a Single-Pass Free-Electron Laser with Phase Shift of Electrons Relative to Photons

Zhukovskii, K. V.; Kalitenko, A. M.

doi:10.1134/s1063784220080241

Cited by 6 publications

(2 citation statements)

References 61 publications

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“…The experiments at FLASH 2 confirm the validity of HLSS FEL and the possibility to use and amplify FEL harmonics as proposed in theoretical works. [39,40,[42][43][44]134] There were other experiments with harmonic multiplication, which involved phase shifters in the undulator lines to reduce the radiation of the fundamental tone and the induced energy spread. The lowered FEL-induced energy spread in the first part of the FEL makes it possible to place the cut point between the buncher and the radiator closer to the end of the FEL.…”

Section: Flash 2 X-ray Felmentioning

confidence: 99%

Theoretical Analysis of the Radiation Properties of Some Major X‐Ray Free Electron Lasers

Zhukovsky

2021

Annalen der Physik

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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.

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Section: Flash 2 X-ray Felmentioning

confidence: 99%

Theoretical Analysis of the Radiation Properties of Some Major X‐Ray Free Electron Lasers

Zhukovsky

2021

Annalen der Physik

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“…synchrotrons and free-electron lasers (FELs) (Potylitsyn A.P., 2010). However, these synchrotron sources are not coherent and are generated by electrons under the spatially periodic magnetic field (Zhukovskii and Kalitenko, 2020). On the other hand, FELs have obtained coherent IR radiation from electrons separated from each other by one wavelength.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Coherent Extreme Ultraviolet Radiation by Considering Simple Hydrogen Atomic Potential

Sayrac

2023

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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In this study, the ionization of a single electron exposed to an intense laser field is computed, and the nonlinear dipole response of a single electron is obtained. The ionization of a single electron exposed to an intense laser field can be computed using the strong field approximation (SFA), also known as the Keldysh theory. This method is based on the idea that the laser field is so strong that it can ionize the electron by tunneling through the Coulomb barrier. In this paper, the Xe, Ne, and H2 gas species are modeled since they have simple atomic systems. All gas species have relative or close ionization potentials. Ultra-short pulse duration (50 fs) is accepted because of the shorter time scale than the electron energy-lattice transfer. The ionization potentials of gas species result in the Keldysh parameter being smaller than one. The electron dipole oscillation spectra of these gas species are simulated by calculating the dipole spectrum considering the Lewenstein model. The electron propagation under the different wavelengths is simulated. The effects of the different driving wavelengths have noticeable effects on the enhancement and the extension of the extreme ultraviolet radiation signal.

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Theoretical Analysis of Radiation Properties of X-Ray Free-Electron Lasers

Zhukovsky

2022

Radiophys Quantum El

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Generation of Coherent X-ray Harmonic Radiation in a Single-Pass Free-Electron Laser with Phase Shift of Electrons Relative to Photons

Cited by 6 publications

References 61 publications

Theoretical Analysis of the Radiation Properties of Some Major X‐Ray Free Electron Lasers

Theoretical Analysis of the Radiation Properties of Some Major X‐Ray Free Electron Lasers

Numerical Simulation of Coherent Extreme Ultraviolet Radiation by Considering Simple Hydrogen Atomic Potential

Theoretical Analysis of Radiation Properties of X-Ray Free-Electron Lasers

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