Toward a fully coherent tender and hard X-ray free-electron laser via cascaded EEHG in fourth-generation synchrotron light sources

Yang, X.; Yu, L.H.; Smaluk, V.; Shaftan, T.; Huang, X.

doi:10.1107/S1600577523006586

Journal of Synchrotron Radiation Journal of
Synchrotron Radiation

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Figure 3
The normalized final energy spread as a function of the momentum compaction of stage 1 is shown for harmonic 100 as the primary y-axis (black) (Yang et al., 2022b

). The ratio of ISR-induced energy spread increase ( $[\Delta{E}_{\rm{ISR}}]$ ) over the energy band separation ( $[\Delta{E}_{\rm{EBS}}]$ ) is plotted as the secondary y-axis (red). We assume the relevant electron beam, seed laser and modulator parameters in simulations based on the NSLS-II upgrade lattice: the electron beam with energy 3 GeV, emittances ɛ_x = 25 pm and ɛ_y = 5 pm and relative energy spread 8 × 10⁻⁴; the seed laser wavelength λ₁ = 256 nm, and peak power depending on harmonic numbers below 10 GW; the modulator of stage 1 with a period of 20 cm and number of periods 10.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 30| Part 5| September 2023| Pages 861-875

https://doi.org/10.1107/S1600577523006586

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