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Figure 6
Simulations of the correlation functions in the horizontal direction performed by the XRT software for 500 eV (left column) and 12 keV (right column) photon energy. Intensity distribution I(x) (a, b), absolute value of the cross-spectral density in the horizontal direction |W(x1,x2)| (c, d), absolute value of the SDC |μ(x1,x2)| (e, f), and absolute value of the spectral degree of coherence along the anti-diagonal line [shown in (e, f)] as a function of separation of two points |μ(Δx)| (g, h) simulated in the horizontal direction 30 m downstream from the undulator source. In (a, b) σ is the r.m.s. value of the beam size, in (c, d) [\zeta_x] is the transverse degree of coherence, and in (g, h) [\xi_x] is the coherence length determined in the horizontal direction.

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