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基于北京正负电子对撞机二期（BEPCII）的塔尔博特效应探索束流尺寸测量

Exploring beam size measurement based on the Talbot effect at BEPCII.

作者信息

Zhang Wan, Zhu Dechong, Sui Yanfeng, Yue Junhui, Cao Jianshe, He Jun

机构信息

Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People's Republic of China.

出版信息

J Synchrotron Radiat. 2023 Sep 1;30(Pt 5):910-916. doi: 10.1107/S1600577523006355. Epub 2023 Aug 23.

DOI:10.1107/S1600577523006355
PMID:37610345
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10481274/
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 µm 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.

摘要

在北京正负电子对撞机II（BEPCII）上，利用基于塔尔博特效应的相位光栅和吸收光栅进行了垂直束斑尺寸测量。同步辐射的横向相干性与束斑尺寸密切相关。由于同步辐射源的部分相干性，可以通过测量在光栅后不同距离处记录的干涉图的可见度衰减来计算相干长度。基于BEPCII 3W1光束线处相干长度与束斑尺寸的关系，获得了68.19±2 µm的垂直束斑尺寸。给出了从光栅塔尔博特法和同步辐射可见光干涉仪法得到的垂直发射度的比较。两种方法得到的垂直发射度分别为1.41 nm rad和1.40 nm rad。0.1%的差异表明光栅塔尔博特法用于束斑尺寸测量是可靠的。考虑到其小的衍射极限和简单的实验装置，该技术在第四代同步辐射光源的小束斑尺寸测量方面具有很大的潜力。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad13/10481274/4a6deab04fc4/s-30-00910-fig11.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad13/10481274/4a6deab04fc4/s-30-00910-fig11.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad13/10481274/0009e62a311a/s-30-00910-fig1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad13/10481274/8abdf4367ae4/s-30-00910-fig2.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad13/10481274/bd469eb534b2/s-30-00910-fig7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad13/10481274/c90d1755d74f/s-30-00910-fig8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad13/10481274/a8537fc88555/s-30-00910-fig9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad13/10481274/99e5cf4eda8c/s-30-00910-fig10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad13/10481274/4a6deab04fc4/s-30-00910-fig11.jpg

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