Comparing coherent mode decomposition methods for undulator radiation in modern synchrotron light sources

Oleg Chubar; Takashi Tanaka; Ruizi Li

doi:10.1117/12.2677842

5 October 2023 Comparing coherent mode decomposition methods for undulator radiation in modern synchrotron light sources

Oleg Chubar, Takashi Tanaka, Ruizi Li

Author Affiliations +

Proceedings Volume 12697, Advances in Computational Methods for X-Ray Optics VI; 1269704 (2023) https://doi.org/10.1117/12.2677842
Event: SPIE Optical Engineering + Applications, 2023, San Diego, California, United States

Abstract

We compare the general Coherent Mode Decomposition (CMD) method implemented in SRW code and the method making use of Hermite-Gaussian functions implemented in SPECTRA code, both methods being applied to partially coherent Undulator Radiation (UR). The comparison is made in terms of modes required for the same accuracy of presentation of 4D cross spectral density and Wigner function of UR for the same electron beam and undulator systems (corresponding to modern high-brightness light sources – currently operating NSLS-II and the planned upgrade of SPring-8). We show that, even though the pre-defined orthogonal analytical functions are not the exact eigenmodes of the partially coherent UR, their use can be perfectly justified in many cases for the UR, especially when limited computational resources are available for performing the numerical decomposition. Before analyzing the CMD results, we also illustrate excellent agreement between UR characteristics computed with SPECTRA and with SRW. All the presented comparisons, and the agreements found, confirm the validity of methods used by the codes and accuracy of their results.

Conference Presentation

Citation Download Citation

Oleg Chubar, Takashi Tanaka, and Ruizi Li "Comparing coherent mode decomposition methods for undulator radiation in modern synchrotron light sources", Proc. SPIE 12697, Advances in Computational Methods for X-Ray Optics VI, 1269704 (5 October 2023); https://doi.org/10.1117/12.2677842

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