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Coherent X-ray beams with energy above 50 keV have been found to have important applications in many research fields.
The linac injector of the proposed Circular Electron-Positron Collider (CEPC), with electron energy up to 30 GeV, is a strong candidate for driving such high-energy X-ray free-electron lasers (XFELs).
In this work, we propose a SASE FEL scheme based on the CEPC linac.
By optimizing key parameters of the CEPC linac beam, such as electron beam energy and normalized emittance as well as energy spread, this design can drive the SASE process efficiently and produce X-rays with photon energies ranging from 50 to 100 keV.
Simulation results indicate that, with an electron beam energy of 25 GeV and a normalized emittance of 0.35 μm·rad, the proposed facility can achieve high-brilliance spectral output at photon energies of 50 keV and above.
This paper presents the detailed setup and simulation results of the proposed FEL scheme.
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