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Figure 3
Single-energy coherent-mode characterization of the HEPS-B4 undulator source at 12.4 keV using the proposed MCBC+HI-SVD framework, with comparison to SRW. Total number of wavefronts (electrons) n = 2 × 104, a pixel resolution of N = 2562, and a truncation mode number m = 500. (a) Transverse intensity distribution and the first three dominant coherent modes u0, u1, u2 obtained from MCBC+HI-SVD. (b) Corresponding results calculated independently with SRW, showing nearly identical intensity and modal structures. (c) DOC functions μ(x1, x2) and μ(y1, y2) evaluated in the horizontal and vertical directions, respectively, demonstrating excellent agreement between the two methods. (d) Quantitative comparison of the transverse intensity profiles and the coherence decay μ(x1 − x2) and μ(y1 − y2) as functions of spatial separation, confirming the high accuracy of MCBC+HI-SVD for coherent-mode decomposition at a single photon energy.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 33| Part 5| September 2026|
https://doi.org/10.1107/S1600577526007034