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- Title
FOCUS: fast Monte Carlo approach to coherence of undulator sources.
- Authors
Siano, M.; Geloni, G.; Paroli, B.; Butti, D.; Lefèvre, T.; Mazzoni, S.; Trad, G.; Iriso, U.; Nosych, A. A.; Torino, L.; Potenza, M. A. C.
- Abstract
FOCUS (Fast Monte CarlO approach to Coherence of Undulator Sources) is a new GPU-based simulation code to compute the transverse coherence of undulator radiation from ultra-relativistic electrons. The core structure of the code, which is written in the language C++ accelerated with CUDA, combines an analytical description of the emitted electric fields and massively parallel computations on GPUs. The combination is rigorously justified by a statistical description of synchrotron radiation based on a Fourier optics approach. FOCUS is validated by direct comparison with multi-electron Synchrotron Radiation Workshop (SRW) simulations, evidencing a reduction in computation times by up to five orders of magnitude on a consumer laptop. FOCUS is then applied to systematically study the transverse coherence in typical third- and fourth-generation facilities, highlighting peculiar features of undulator sources close to the diffraction limit. FOCUS is aimed at fast evaluation of the transverse coherence of undulator radiation as a function of the electron beam parameters, to support and help prepare more advanced and detailed numerical simulations with traditional codes like SRW.
- Subjects
UNDULATOR radiation; SYNCHROTRON radiation; FREE electron lasers; RELATIVISTIC electrons; FOURIER transform optics; ELECTRIC fields; GRAPHICS processing units
- Publication
Journal of Synchrotron Radiation, 2023, Vol 30, Issue 1, p217
- ISSN
0909-0495
- Publication type
Article
- DOI
10.1107/S1600577522010748