Simulations were carried out to study spatial coherence properties of the 4th generation high-energy storage rings based on the previous work [Khubbitdinov et al., JSR (2019)]. It aimed to study special effects, namely an effect of the detuning from the undulator resonance photon energy and energy spread effects of the electron beam in a low-emittance storage ring. These simulations were performed with the XRayTracer (XRT) software package [Klementiev & Chernikov, SPIE 9209 (2014)] and compared with the results of analytical calculations [Geloni et al., JSR (2018)]. The simulations were done in the wide range of photon energies for different electron beam energy spread values and compared to the simulations performed for the detuned photon energy from resonant. The analysis showed that the effect of detuning in combination with the electron beam energy spread significantly reduce coherence properties of the photon beam in a low emittance storage ring sources.
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