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Figure 5
(a)–(d) Representative wire scanner vertical beam size measurements at photon energies of 500, 700, 900 and 1100 eV, respectively. The photo-electron charge recorded by the EH-GMD is shown as a function of tungsten wire position (500 µm diameter), and the solid curves represent fits used to extract the FWHM. (e) Statistical summary of vertical beam sizes measured during the January and May 2025 machine-study campaigns. Beam sizes extracted from both photo-electron and photo-ion charge signals were combined. Symbols represent mean FWHM values, and error bars indicate the corresponding standard deviations for each photon energy.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 33| Part 4| July 2026|
https://doi.org/10.1107/S1600577526005382
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