Simulation studies of external seeding schemes for Shanghai soft X-ray free electron laser

Weijie Fan; Chao Feng; Minghua Zhao

doi:10.11884/HPLPB202234.210262

Journals >High Power Laser and Particle Beams >Volume 34 >Issue 3 >Page 031016 > Article

High Power Laser and Particle Beams
Vol. 34, Issue 3, 031016 (2022)

Simulation studies of external seeding schemes for Shanghai soft X-ray free electron laser

Weijie Fan^1、2, Chao Feng^3、*, and Minghua Zhao¹

Author Affiliations

¹Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

²University of Chinese Academy of Sciences, Beijing 100049, China

³Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China

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DOI: 10.11884/HPLPB202234.210262 Cite this Article

Weijie Fan, Chao Feng, Minghua Zhao. Simulation studies of external seeding schemes for Shanghai soft X-ray free electron laser[J]. High Power Laser and Particle Beams, 2022, 34(3): 031016 Copy Citation Text

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Abstract

Shanghai Soft X-ray Free Electron Laser User Facility (SXFEL-UF) is the first X-ray FEL in China that can produce coherent radiation in the water-window regime. The main working modes of SXFEL are self-amplified spontaneous emission and external seeding schemes. This paper mainly focuses on the start to end simulations of the external seeding schemes including echo-enabled harmonic generation-high gain harmonic generation cascade (EEHG-HGHG cascade) and single stage echo-enabled harmonic generation (EEHG). 3D simulations indicates that these external seeding schemes can generate coherent X-ray radiation at soft X-ray regime directly from a conventional UV seed laser.

Keywords

echo-enabled harmonic generation free electron laser fully coherent high gain harmonic generation narrow-bandwidth

$ {\mathit{\Delta}} _E^2 = \frac{{55{e^2}\hbar c}}{{48\sqrt 3 }}\frac{L}{{{\rho ^3}}}{\gamma ^7} \text{，} $

(1)

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$ {\left\langle {\Delta {\sigma _{\rm{E}}}} \right\rangle _{{\text{IBS}}}} \simeq {\left( {2{\pi ^{{3 /2}}}\ln {\mathit{\Lambda}}{r_e}\frac{I}{I_{\rm{A}}}\frac{1}{{4\pi \sigma _x^3}}\frac{{{\beta _x}}}{\gamma }s} \right)^{{1/ 2}}}{E_0} $

(2)

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Weijie Fan, Chao Feng, Minghua Zhao. Simulation studies of external seeding schemes for Shanghai soft X-ray free electron laser[J]. High Power Laser and Particle Beams, 2022, 34(3): 031016

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