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1.中国科学院上海应用物理研究所 上海 201800
2.中国科学院上海高等研究院 国家蛋白质科学研究上海设施 上海 201210
3.中国科学技术大学 国家同步辐射实验室 合肥 230029
4.中国科学院大学 北京 100049
5.上海擎朗智能科技有限公司 上海 201206
LU Lanlu, female, born in 1991, graduated from Shanghai Institute of Applied Physics, Chinese Academy of Sciences with a master of engineering degree in 2013, focusing on X-ray absorption spectroscopy methodology and its applications
JIANG Zheng, E-mail: jiangz@ustc.edu.cn
QIN Wenming, E-mail: qinwenming@sari.ac.cn
Received:05 December 2024,
Revised:2025-03-10,
Published:15 November 2025
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卢兰露,蒋罗震,刘洋等.蛋白质设施BL17B线站高次谐波抑制镜系统研制[J].核技术,2025,48(11):110104.
LU Lanlu,JIANG Luozhen,LIU Yang,et al.Development of a harmonic rejection mirror system at the NFPSS-BL17B beamline[J].NUCLEAR TECHNIQUES,2025,48(11):110104.
卢兰露,蒋罗震,刘洋等.蛋白质设施BL17B线站高次谐波抑制镜系统研制[J].核技术,2025,48(11):110104. DOI: 10.3724/j.0253-3219.2025.hjs.48.240498. CSTR: 32193.14.hjs.CN31-1342/TL.2025.48.240498.
LU Lanlu,JIANG Luozhen,LIU Yang,et al.Development of a harmonic rejection mirror system at the NFPSS-BL17B beamline[J].NUCLEAR TECHNIQUES,2025,48(11):110104. DOI: 10.3724/j.0253-3219.2025.hjs.48.240498. CSTR: 32193.14.hjs.CN31-1342/TL.2025.48.240498.
在低能区X射线吸收精细结构(X-ray Absorption Fine Structure,XAFS)实验中,高次谐波污染会导致数据振幅衰减和谱形失真,从而影响结构解析的可靠性。上海同步辐射光源(Shanghai Synchrotron Radiation Facility,SSRF)蛋白质设施(National Facility for Protein Science in Shanghai,NFPSS)BL17B线站在低能区XAFS实验中亦面临该问题。为此,本文基于BL17B的光学特性,研制了一种高次谐波抑制镜(Harmonic Rejection Mirror,HRM)系统,以提升实验数据的质量和可靠性。首先,采用XOP软件对BL17B的光学系统进行模拟,验证了HRM双平面反射镜结构设计的可行性,确定了Ni/Rh双镀层、固定5.8 mrad掠入射角以及镀层尺寸等关键参数。其次,通过精密机械结构设计,使HRM具备掠入射角调节、光路对准及镀层切换多维调节能力,以适应不同实验需求。在安装与调试阶段,采用全反射临界能量法解决掠入射角精准控制的难题,确保HRM达到设计要求。最后,结合单色器摇摆曲线测试和XAFS实验,对HRM的谐波抑制能力进行评估。实验结果表明,该HRM可将5~10 keV能区内的有效高次谐波含量抑制在10
-4
以下,同时保持基波通过率高于70%。全反射临界能量法实现了掠入射角0.01 mrad的校准精度,确保了HRM按设计运行。在5 keV条件下,HRM有效提高了光束的单色性,并显著改善了Ti箔的XAFS光谱质量,消除了谱形失真。该HRM的应用成功将BL17B XAFS实验的能量下限从10 keV拓展至5 keV,显著提升了低能区XAFS实验能力,并为同步辐射光源的高次谐波抑制提供了技术参考。
Background
2
Harmonic contamination is a major issue in low-energy X-ray absorption fine structure (XAFS) experiments
leading to amplitude attenuation and spectral distortion
which compromise the reliability of structural analysis. The BL17B beamline
part of the National Facility for Protein Science in Shanghai (NFPSS) and operated within the Shanghai Synchrotron Radiation Facility (SSRF)
also faces this challenge in its low-energy XAFS experiments.
Purpose
2
This study aims to develop a Harmonic Rejection Mirror (HRM) system tailored to the optical characteristics of the BL17B beamline at SSRF to improve the quality and reliability of XAFS data.
Methods
2
Firstly
the simulation software XOP was applied to modelling the optical system of BL17B
confirming the feasibility of the HRM system based on a dual-plane mirror design. Key parameters
including the use of Ni and Rh coatings
a fixed grazing incidence angle of 5.8 mrad
and coating dimensions
were optimized accordingly. Then
a precise mechanical structure was designed
enabling multi-dimensional adjustments
including grazing incidence angle tuning
optical alignment
and coating switching to accommodate different experimental requirements. During installation and commissioning
the total reflection critical energy measurement method was employed to address the challenge of accurate grazing incidence angle control
ensuring the system met design specifications. Finally
the performance of HRM was evaluated by monochromator rocking curve measurements and XAFS experiments.
Results
2
Experimental results show that the HRM effectively suppresses effective harmonic contamination to below 10
-4
in 5~10 keV while maintaining a fundamental beam transmission above 70%. The total reflection critical energy measurement method achieves a grazing incidence angle calibration precision of 0.01 mrad
ensuring that the HRM operates as designed. At 5 keV
the HRM signi
ficantly enhances beam monochromaticity and improves Ti foil XAFS data quality by eliminating spectral distortions.
Conclusions
2
The implementation of the HRM in this study successfully extends the lower energy limit of XAFS experiments at BL17B from 10 keV to 5 keV
significantly enhancing the capability of low-energy XAFS experiments
providing a valuable technical reference for harmonic suppression in synchrotron radiation sources.
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