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

TL;DR

This paper introduces a computationally efficient algorithm for simulating partially-coherent undulator radiation in advanced storage rings, enabling rapid and resource-light beamline analysis with validated accuracy.

Contribution

It presents a novel one-dimensional mode decomposition method that simplifies coherence simulations, reducing computational resources needed compared to existing approaches.

Findings

The method accurately models focusing of undulator radiation in fourth-generation storage rings.

Simulations run interactively on a laptop, demonstrating high efficiency.

Results agree well with more complex existing simulation techniques.

Abstract

A new algorithm to perform coherent mode decomposition of the undulator radiation is proposed. It is based in 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 in a laptop. We study the focusing with lenses of the radiation emitted by an undulator in a fourth-generation storage ring (EBS-ESRF). Results are compared against multiple optics packages implementing a variety of methods for dealing with partial coherence: full 2D 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.