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A new algorithm to perform coherent mode decomposition of undulator radiation is proposed. It is based on separating the horizontal and vertical directions, reducing the problem by working with one‐dimension wavefronts. The validity conditions of this approximation are discussed. Simulations require low computer resources and run interactively on a laptop. The focusing with lenses of the radiation emitted by an undulator in a fourth‐generation storage ring (EBS‐ESRF) is studied. Results are compared against multiple optics packages implementing a variety of methods for dealing with partial coherence: full two‐dimension coherent mode decomposition, Monte Carlo combination of wavefronts from electrons entering the undulator with different initial conditions, and hybrid ray‐tracing correcting geometrical optics with wave optics.

A fast and lightweight tool for partially coherent beamline simulations in fourth‐generation storage rings based on coherent mode decomposition