High-brightness self-seeded hard x-ray free-electron laser at PAL-XFEL (Conference Presentation)

Inhyuk Nam

doi:10.1117/12.2669499

8 June 2023 High-brightness self-seeded hard x-ray free-electron laser at PAL-XFEL (Conference Presentation)

Inhyuk Nam

Proceedings Volume 12579, Laser Acceleration of Electrons, Protons, and Ions VII; 1257902 (2023) https://doi.org/10.1117/12.2669499
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

X-ray free electron lasers (XFELs) are capable of producing x-ray beams with intense peak brightness, full transverse coherence, and femtosecond-scale pulse duration through Self-Amplified Spontaneous Emission (SASE). However, the SASE FELs suffer from noisy spikes in time and spectrum due to radiation originating from electron beam shot noise. To overcome these limitations and realize bright, fully coherent FEL sources, self-seeding is a promising solution. In this study, we utilized the forward Bragg-diffraction (FBD) monochromator at PAL-XFEL to generate almost fully coherent hard X-ray self-seeded (HXRSS) free-electron laser (FEL) pulses with an unprecedented peak-brightness and a narrow spectrum. Our HXRSS FEL demonstrated outstanding performance across a photon energy range spanning from 3.5keV to 14.6keV. These findings provide valuable insights for the development of advanced X-ray sources and their applications. In order to meet the demands of experimental applications such as resonant inelastic X-ray scattering, nuclear resonance scattering, and X-ray Raman spectroscopy, we have developed x-ray energy scanning method utilizing a double crystal monochromator (DCM). This approach offers improved spectral purity and a fully calibrated energy scale. In this study, we will present recent experimental findings on the characteristics of hard X-ray self-seeded FEL at PAL-XFEL. These results have important implications for the advancement of X-ray spectroscopy and related research fields.

Conference Presentation

Citation Download Citation

Inhyuk Nam "High-brightness self-seeded hard x-ray free-electron laser at PAL-XFEL (Conference Presentation)", Proc. SPIE 12579, Laser Acceleration of Electrons, Protons, and Ions VII, 1257902 (8 June 2023); https://doi.org/10.1117/12.2669499

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KEYWORDS

Plasma

Laser radiation

Electron beams

Synchrotron radiation

Ultrafast phenomena

X-rays

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