Introduction of Fourth-Generation High Energy Photon Source HEPS and the Beamlines for High-Pressure Research
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摘要: 作为国家重大科技基础设施“十三五”规划重点建设的项目之一，目前，高能同步辐射光源已经在北京怀柔科学城开始建设，项目目标是建设具有极低发射度、重点覆盖高能区（约300 keV）的第四代同步辐射光源。新的高能光源将为科学研究提供光斑更小、亮度更高、相干性更好的X射线探针。同步辐射光源已经帮助科研人员在高压科学研究的诸多领域取得了丰硕的成果。反过来，应高压研究更高的需求，也在促进同步辐射实验技术的不断发展与进步。本文旨在对高能同步辐射光源首批线站中能够开展高压研究的高压光束线站、吸收谱学线站、高分辨谱学线站和显微成像线站的建设方案进行介绍，一方面有助于用户更好地了解相关设施，另一方面也希望结合用户需求完善后续线站的建设工作，共同推进高压学科在同步辐射领域的发展。Abstract: The High Energy Photon Source (HEPS) located at Huairou’s Science City in Bejing, one of the key projects listed in the “13th Five-year Plan for national major scientific and technological infrastructure”, has been under construction since 2019. HEPS will be a world-leading 4th generation high energy synchrotron radiation source featuring very low emittance, very high brilliance and high X-ray energy (about 300 keV).The new light source will provide X-ray probes with smaller size, higher brightness and better coherence for scientific researches. Synchrotron radiation technology has helped researchers achieve rich results in high-pressure research. In turn, the demand for high-pressure research is also promoting the development of synchrotron radiation experiment technology. In this paper, the design of the beamlines in the HPES phase I for high-pressure research are introduced, including a high-pressure beamline, an X-ray absorption spectroscopy beamline, a hard X-ray high energy resolution spectroscopy beamline and a transmission X-ray microscopy beamline. It is expected to help users well understand the functions of these beamlines, and further promote the development of synchrotron radiation high-pressure research together with the user community via seamless integration of techniques and users’ various requirements for advancing high-pressure science.
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Key words:
- high energy photon source /
- high pressure /
- beamlines
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图 5 X射线吸收谱学线站的元素覆盖示意图（红色虚线表示K边能量范围，蓝色虚线表示L边能量范围）
Figure 5. Schematic of element coverage of XAS (The red and blue dotted lines are energy ranges of K-edge and L-ledge, respectively)
图 8 硬X射线高分辨谱学线站核共振散射模式的光学布局
Figure 8. Optical layout of nuclear resonant scattering of the H2O beamline
图 9 硬X射线高分辨谱学线站X射线拉曼散射模式的光学布局
Figure 9. Optical layout of X-ray Raman scattering of the H2O beamline
Energy/
GeVCircumference/
mNumber of
straight sectionsBeam current/
mANatural emittance/
pmradInjection Bunch
number6 1360.4 48 200 34.2 Top-up 680/63 
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表 2 X射线吸收谱线站的主要设计指标
Table 2. Main parameters of XAS beamline
Energy range/keV Energy resolution（ΔE/E） Flux/(ph·s−1) Spot size /
(μm × μm)Methods 4.8−45 2 × 10−4 Si (111) 5 × 1013@10 keV (non-focus) 0.35 × 0.35 (focus) XAFS/XRD/XRF/FTIR/Mass spectra 4 × 10−5 Si (311) 5 × 1012@10 keV (focus) 0.35 × 0.35 (focus) Time resolution: 25 ms/spectra
Detection limit of trace element > 1×10−7
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表 3 H2O线站实验方法及技术指标
Table 3. Specification of methods at the H2O beamline
Method Energy range/keV Energy resolution/meV Inject mode Spot size/ (μm × μm) Flux/(ph·s−1) Nuclear resonant scattering 14.4 (57Fe) 2，1 63-bunches 2 × 2 About 1.5 × 1010 X-ray Raman scattering 10 800 680-bunches 3 × 3 About 3 × 1013
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