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- Title
Exploring beam size measurement based on the Talbot effect at BEPCII.
- Authors
Wan Zhang; Dechong Zhu; Yanfeng Sui; Junhui Yue; Jianshe Cao; Jun He
- Abstract
Vertical beam size measurements were carried out at Beijing Electron-Positron Collider II (BEPCII) using a phase grating and an absorption grating based on the Talbot effect. The transverse coherence of synchrotron radiation is closely related to beam size. Due to the partial coherence of the synchrotron radiation source, the coherence length can be calculated by measuring the visibility decay of interferograms recorded at different distances behind the gratings. A vertical beam size of 68.19 ± 2 mm was obtained based on the relationship between the coherence length and beam size at the 3W1 beamline of BEPCII. A comparison of the vertical emittance derived from the grating Talbot method and the synchrotron radiation visible light interferometer method was presented. The vertical emittances from the two methods are 1.41 nm rad and 1.40 nm rad, respectively. The 0.1% difference indicates that the grating Talbot method for beam size measurement is reliable. This technique has great potential for small beam size measurement of fourth-generation synchrotron radiation light sources, considering its small diffraction limitation and simple experimental setups.
- Subjects
SYNCHROTRON radiation sources; OPTICAL interferometers; VISIBLE spectra; OPTICAL diffraction; SYNCHROTRON radiation
- Publication
Journal of Synchrotron Radiation, 2023, Vol 30, Issue 5, p910
- ISSN
0909-0495
- Publication type
Article
- DOI
10.1107/S1600577523006355