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一种用于小角X射线散射的新型双厚度半透明束流挡板。

A new dual-thickness semi-transparent beamstop for small-angle X-ray scattering.

作者信息

Wu Haijuan, Li Zhihong

机构信息

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

出版信息

J Synchrotron Radiat. 2024 Sep 1;31(Pt 5):1197-1208. doi: 10.1107/S1600577524007392. Epub 2024 Aug 25.

DOI:10.1107/S1600577524007392
PMID:39182204
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11371043/
Abstract

An innovative dual-thickness semi-transparent beamstop designed to enhance the performance of small-angle X-ray scattering (SAXS) experiments is introduced. This design integrates two absorbers of differing thicknesses side by side into a single attenuator, known as a beamstop. Instead of completely stopping the direct beam, it attenuates it, allowing the SAXS detector to measure the transmitted beam through the sample. This approach achieves true synchronization in measuring both scattered and transmitted signals and effectively eliminates higher-order harmonic contributions when determining the transmission light intensity through the sample. This facilitates and optimizes signal detection and background subtraction. This contribution details the theoretical basis and practical implementation of this solution at the SAXS station on the 1W2A beamline at the Beijing Synchrotron Radiation Facility. It also anticipates its application at other SAXS stations, including that at the forthcoming High Energy Photon Source, providing an effective solution for high-precision SAXS experiments.

摘要

介绍了一种创新的双厚度半透明光束阻挡器，旨在提高小角X射线散射（SAXS）实验的性能。这种设计将两个不同厚度的吸收体并排集成到一个称为光束阻挡器的单一衰减器中。它不是完全阻挡直射光束，而是对其进行衰减，使SAXS探测器能够测量透过样品的透射光束。这种方法在测量散射和透射信号时实现了真正的同步，并在确定透过样品的透射光强度时有效地消除了高阶谐波贡献。这有助于并优化了信号检测和背景扣除。本文详细介绍了该解决方案在北京同步辐射装置1W2A光束线上SAXS站的理论基础和实际应用。它还预期了其在其他SAXS站的应用，包括即将建成的高能光子源的SAXS站，为高精度SAXS实验提供了一种有效的解决方案。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/124f/11371043/cb83ee971338/s-31-01197-fig5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/124f/11371043/95438c6c03c4/s-31-01197-fig1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/124f/11371043/e2c47f3038c4/s-31-01197-fig2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/124f/11371043/4ed2b5d28ea0/s-31-01197-fig3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/124f/11371043/d0aed9a0e6ec/s-31-01197-fig4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/124f/11371043/cb83ee971338/s-31-01197-fig5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/124f/11371043/95438c6c03c4/s-31-01197-fig1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/124f/11371043/e2c47f3038c4/s-31-01197-fig2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/124f/11371043/4ed2b5d28ea0/s-31-01197-fig3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/124f/11371043/d0aed9a0e6ec/s-31-01197-fig4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/124f/11371043/cb83ee971338/s-31-01197-fig5.jpg

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2
Contrast variation SAXS: Sample preparation protocols, experimental procedures, and data analysis.对比变分小角 X 射线散射：样品制备方案、实验程序和数据分析。
Methods Enzymol. 2022;677:41-83. doi: 10.1016/bs.mie.2022.08.007. Epub 2022 Sep 22.
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Indirect X-ray detectors with single-photon sensitivity.
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Development of NIST Standard Reference Material 2082, a Pathlength Standard for Measurements in the Ultraviolet Spectrum.美国国家标准与技术研究院标准参考物质2082的研制，一种用于紫外光谱测量的光程标准。
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