High Repetition Rate and Coherent Free-Electron Laser in the X-Rays Range Tailored for Linear Spectroscopy

Petrillo, V.; Opromolla, Michele; Bacci, A.; Drebot, I.; Ghiringhelli, G.; Petralia, A.; Puppin, E.; Conti, M.; Rossi, A. R.; Tagliaferri, Alberto; Samsam, Sanae; Serafini, L.; Rossi, G.

doi:10.3390/instruments3030047

Cited by 9 publications

(7 citation statements)

References 29 publications

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“…However, seeded FELs based on self-modulation scheme [51] or optical cavity [52,53,54] have the potential to reduce the requirements for state-of-art laser system and thus obtain high-repetitionrate fully coherent soft X-ray FEL pulses. In the future, the physical design of the externally seeded FEL at SHINE needs to be further optimized.…”

Section: Discussionmentioning

confidence: 99%

Optimization and stability analysis of the cascaded EEHG-HGHG free-electron laser

Yang,

Yan,

Zhu

et al. 2022

Preprint

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X-ray free-electron lasers (XFELs) are powerful tools to explore and study nature for achieving remarkable advances. Generally, seeded FELs are ideal sources for supplying full coherent soft xray pulses. Benefiting from the high-frequency up-conversion efficiency, the cascading configuration with echo-enabled harmonic generation (EEHG) and high-gain harmonic generation (HGHG) holds promising prospects for generating full coherent radiation at 1 nm wavelength. In this paper, we design and optimize EEHG-HGHG configuration using parameters of Shanghai High-Repetition-Rate XFEL and Extreme Light Facility. In addition, we systematically analyze the effect of relative timing jitter on the output FEL performance based on various start-to-end electron beams. The intensive numerical simulations show that the cascaded EEHG-HGHG scheme can achieve 1 nm FEL pulses with peak power up to 15 GW. Further sensitivity analysis indicates that the relative timing jitter between the electron beam and seed laser has a significant impact on the FEL performance.The RMS timing jitter of 3 fs can lead to the final output pulse energy fluctuations of 29.16%.

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Section: Discussionmentioning

confidence: 99%

Optimization and stability analysis of the cascaded EEHG-HGHG free-electron laser

Yang,

Yan,

Zhu

et al. 2022

Preprint

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“…Based on these characteristics, seeded FELs are of great value in many research fields, e.g. spectroscopy [37] and coherent diffraction imaging [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Ultra-high harmonic conversion of a seeded free-electron laser via harmonic optical klystron

Wang,

Zeng,

Zhang

et al. 2024

Phys. Scr.

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External seeded free-electron lasers (FELs) are compelling tools for generating fully coherent EUV and soft X-ray radiations. Echo-enabled harmonic generation (EEHG), the most typical representative of external seeded FELs, has witnessed a remarkable growth of fully coherent FELs in the last decade, continuously evolving towards higher harmonic conversions and shorter wavelengths. Ultra-high harmonic generation is imperative in the field of FELs. This paper presents a novel method for generating FEL radiation with ultra-high harmonic conversion, utilizing harmonic optical klystron in combination with EEHG. This method can effectively increase the harmonic conversion order to about 90. Theoretical analysis and numerical simulations show that intense and almost fully coherent FEL pulses can be generated with a wavelength of 3 nm. At the same time, the seed laser intensity required by this scheme is lower compared to nominal EEHG, thus facilitating the generation of high-repetition-rate seeded FELs.

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“…CW seeded FELs can produce higher output at both EUV and x-ray wavelengths and are therefore more likely to be a comprehensive platform for the cutting-edge nanostructure and nanodevice researches [28][29][30]. Other applications such as time-resolved spectroscopy [31], coherent diffraction imaging [32][33][34] and EUV microscopy [35,36], would also benefit from CW seeded FELs.…”

Section: Introductionmentioning

confidence: 99%

High-repetition-rate seeded free-electron laser with direct-amplification of an external coherent laser

Wang¹,

Feng

Faatz

et al. 2022

New J. Phys.

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Various scientific and industrial researches such as spectroscopy and advanced nano-technologies have been demanding high flux and fully coherent EUV and X-ray radiation. These demands can be commendably satisfied with a MHz-level repetition-rate seeded free-electron laser (FEL). Dictated by the seed laser system, seeded FELs have faced obstacles for the realization of MHz repetition rate. Reducing the required peak power of an external coherent seed laser can effectively increase the repetition rate of a seeded FEL. This paper presents a novel technique that employs a long modulator as a carrier for laser amplification and electron modulation, which is quite different from nominal seeded FELs. Applications of the proposed technique into high-gain harmonic generation (HGHG) and echo-enabled harmonic generation (EEHG) are investigated. Simulation results demonstrate that seed laser power is reduced by about three orders of magnitude and the FEL radiation possesses consistently high coherence and power stability with respect to the nominal HGHG or EEHG. The proposed technique paves the way for the realization of fully coherent EUV and soft X-ray FELs with a repetition rate of MHz and an average power of about 100 W.

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High Repetition Rate and Coherent Free-Electron Laser in the X-Rays Range Tailored for Linear Spectroscopy

Cited by 9 publications

References 29 publications

Optimization and stability analysis of the cascaded EEHG-HGHG free-electron laser

Optimization and stability analysis of the cascaded EEHG-HGHG free-electron laser

Ultra-high harmonic conversion of a seeded free-electron laser via harmonic optical klystron

High-repetition-rate seeded free-electron laser with direct-amplification of an external coherent laser

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