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镜面反射后的X射线束质量：四代储存环光束线中环形镜的实验与模拟结果

X-ray beam quality after a mirror reflection: Experimental and simulated results for a toroidal mirror in a 4 generation storage-ring beamline.

作者信息

Reyes-Herrera Juan, Celestre Rafael, Cammarata Marco, Barrett Raymond, Levantino Matteo, Sanchez Del Rio Manuel

机构信息

European Synchrotron Radiation Facility, Grenoble, 38043, France.

出版信息

Open Res Eur. 2023 Oct 12;3:173. doi: 10.12688/openreseurope.16211.1. eCollection 2023.

DOI:10.12688/openreseurope.16211.1
PMID:37990739
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10660299/
Abstract

BACKGROUND

The surface errors found in X-ray mirrors constitute a limiting factor for preserving beam quality. This is particularly important when the X-ray beam has low emittance and a significant coherence fraction, like in newly upgraded synchrotron storage rings.

METHODS

We studied the fringes observed in the image of an undulator-produced X-ray beam reflected by a high-quality toroidal mirror. The measurements and simulations were performed using different conditions: a photon beam either monochromatic or with large bandwidth, reflected by a mirror with variable curvature.

RESULTS

The experimental data are compared with up-to-date simulation including partial coherence.

CONCLUSIONS

The observed fringes in the unfocused beam correlate with low spatial frequency structures in mirror profiles, irrespective of beam coherence. Both classical ray tracing and partially coherent simulations through coherent mode decomposition are confirmed as accurate methods for such simulations.

摘要

背景

X射线镜中发现的表面误差是保持光束质量的一个限制因素。当X射线束具有低发射度和显著的相干分数时，这一点尤为重要，就像在新升级的同步加速器储存环中那样。

方法

我们研究了由高质量环形镜反射的波荡器产生的X射线束图像中观察到的条纹。测量和模拟是在不同条件下进行的：光子束要么是单色的，要么具有大带宽，由具有可变曲率的镜子反射。

结果

将实验数据与包括部分相干性的最新模拟进行了比较。

结论

在未聚焦光束中观察到的条纹与镜轮廓中的低空间频率结构相关，与光束相干性无关。经典光线追踪和通过相干模式分解的部分相干模拟都被确认为进行此类模拟的准确方法。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dd91/10660299/4231ba91b362/openreseurope-3-17499-g0013.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dd91/10660299/6050a1d309e9/openreseurope-3-17499-g0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dd91/10660299/bd4b721e94dc/openreseurope-3-17499-g0003.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dd91/10660299/b507ccb4e9b9/openreseurope-3-17499-g0009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dd91/10660299/134fea35476a/openreseurope-3-17499-g0010.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/dd91/10660299/4231ba91b362/openreseurope-3-17499-g0013.jpg

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本文引用的文献

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J Synchrotron Radiat. 2022 Nov 1;29(Pt 6):1354-1367. doi: 10.1107/S1600577522008736. Epub 2022 Oct 18.
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DABAM: an open-source database of X-ray mirrors metrology.DABAM：一个X射线镜计量学的开源数据库。
J Synchrotron Radiat. 2016 May;23(Pt 3):665-78. doi: 10.1107/S1600577516005014. Epub 2016 Apr 20.
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A hybrid method for X-ray optics simulation: combining geometric ray-tracing and wavefront propagation.
一种用于X射线光学模拟的混合方法：结合几何光线追踪和波前传播。
J Synchrotron Radiat. 2014 Jul;21(Pt 4):669-78. doi: 10.1107/S160057751400650X. Epub 2014 May 15.
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SHADOW3: a new version of the synchrotron X-ray optics modelling package.SHADOW3：一个新的同步加速器 X 射线光学建模包版本。
J Synchrotron Radiat. 2011 Sep;18(Pt 5):708-16. doi: 10.1107/S0909049511026306. Epub 2011 Jul 20.