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Modelling undulators in ray tracing simulations

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arxiv 2410.13672 v1 pith:6FIVZ4FS submitted 2024-10-17 physics.acc-ph

Modelling undulators in ray tracing simulations

classification physics.acc-ph
keywords fieldtracingdistributionelectronenergymodelsradiationseveral
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We introduce a model that can accurately simulate radiation from undulator sources for ray tracing applications. It incorporates several key effects relevant to 4$^\text{th}$ generation synchrotron sources, such as electron emittance, energy spread, and diffraction-limited beam size. This code has been developed as part of SHADOW4, the latest version of the widely used SHADOW X-ray optics ray tracing program. The approach relies on calculating the field distribution in the far field, which determines the ray divergences. The integration of existing models for electron energy spread is also addressed. Rays sampled at the source follow a size distribution derived by backpropagating the far field radiation. These models are detailed, and several examples are provided.

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