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Development of a low-loss magnetic-coupling pickup for 166.6-MHz quarter-wave beta=1 superconducting cavities

Nuclear Science and Techniques 2020年第9期31卷 25-32页

作者： Tong-Ming Huang Pei Zhang Zhong-Quan Li Xin-Ying Zhang Hai-Ying Lin Qiang Ma Fan-Bo Meng Wei-Min Pan Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Key Laboratory of Particle Acceleration Physics and Technology IHEPCASBeijing 100049China School of Nuclear Sciences and Technology University of Chinese Academy of SciencesBeijing 100049China

166.6-MHz quarter-waveβ=1 superconducting cavities have been adopted for the High Energy Photon source,a 6-GeV diffraction-limited synchrotron light source currently under construction.A large helium jacket was required to accommodate the enlarged cavity beam pipe for the heavy damping of higher-order modes;the original electric-probe pickup thus becomes inevitably long with unfavorable mechanical properties.Relocated to an existing high-pressure-rinsing port,a magnetic-loop pickup was designed,characterized by low radio-frequency and cryogenic losses and being multipacting-free and insensitive to manufacturing and assembly tolerances.The consequent removal of the original pickup port from the cavity largely simplified the helium jacket fabrication and may also reduce cavity contamination.This paper presents a comprehensive design of a low-loss magnetic-coupling pickup for quarter-waveβ=1 superconducting cavities.The design can also be applied to other non-elliptical structures.

关键词： Pickup Magnetic coupling Quarter-wave cavity Superconducting cavity Low loss synchrotron light source

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Scheme for generating 1 nm X-ray beams carrying orbital angular momentum at the SXFEL

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Nuclear Science and Techniques 2020年第9期31卷 33-44页

作者： He-Ping Geng Jian-Hui Chen Zhen-Tang Zhao Chinese Academy of Sciences Shanghai Institute of Applied PhysicsShanghai 201800China University of Chinese Academy of Sciences Beijing 100049China Chinese Academy of Sciences Shanghai Advanced Research InstituteShanghai 201210China

Optical vortices have the main features of helical wavefronts and spiral phase structures,and carry orbital angular momentum.This special structure of visible light has been produced and studied for various applications.These notable characteristics of photons were also tested in the extreme-ultraviolet and X-ray regimes.In this article,we simulate the use of a simple afterburner configuration by directly adding helical undulators after the SASE undulators with the Shanghai Soft X-ray FEL to generate high intensity X-ray vortices with wavelengths^1 nm.Compared to other methods,this approach is easier to implement,cost-effective,and more efficient.

关键词： X-ray Orbital angular momentum(OAM) synchrotron light source Free-electron laser(FEL)

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Design and test of support for HEP Smagnets

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Radiation Detection Technology and Methods 2021年第1期5卷 95-101页

作者： Chunhua Li Zihao Wang Minxian Li Haijing Wang Lan Dong Ningchuang Zhou Lei Wu Huamin Qu Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Purpose High Energy Photon source(HEPS)has the characteristics of high energy and low emittance,which requires that the 1st natural frequency of the magnet support assembly should be better than 54 Hz and the moving resolution of girder should be less than 5μm.The prototypes have been designed and fabricated to meet the requirements.Methods In the design process of the support system model,double-wedge adjusting mechanism and concrete plinth construction are adopted to meet the requirements of adjusting resolution and stability.The FEA and the dynamic stiffness testing technique are used to verify the rationality of the design model.The stability and motion performance tests are performed to verify that the prototype meets the design requirements.Results Experimental results showthat,in all cases,the lowest first-order natural frequency of the support system is 55Hz,the amplification between magnet and ground is less than 1.05 in the directions perpendicular to the beam,the moving resolution can reach 1μm,and the girder can be locked in place with an error of less than 5μm.Conclusion The prototype of HEPS support system meets the requirements of stability and motion performance.The girder body and wedge mechanism made with iron or steel have little influence on the stability of the support system.The accuracy of dynamic stiffness test and finite element simulation results is verified.Further test will be performed in the HEPS site to verify the performance.

关键词： synchrotron light source Magnet support Prototype Stability Motion test

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上海光源微束劳厄技术的发展及其在材料科学研究中的应用

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Science China Materials 2021年第9期64卷 2348-2358页

作者：任晨宇蒋力寇嘉伟闫帅李丽刘孟廷董晓浩陈凯李中亮李志军黄晓旭邰仁忠 Center for Advancing Materials Performance from the Nanoscale(CAMP-Nano) State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049China Center for Thorium Molten Salt Reactor System Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China Shanghai synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China International Joint Laboratory for light Alloys(MOE) College of Materials Science and EngineeringChongqing UniversityChongqing 400044China

同步辐射微束劳厄技术以其超高的晶体取向和晶格应力/应变分辨率而在材料科学研究中显示出重要的应用潜力.本文报道了我国上海光源在微束劳厄技术方面的最新进展.目前已获得40×50μm2的X射线束斑尺寸,在我国(不含台湾省)首次实现了白... 详细信息

同步辐射微束劳厄技术以其超高的晶体取向和晶格应力/应变分辨率而在材料科学研究中显示出重要的应用潜力.本文报道了我国上海光源在微束劳厄技术方面的最新进展.目前已获得40×50μm2的X射线束斑尺寸,在我国(不含台湾省)首次实现了白光微束劳厄二维扫描实验,利用我国首套完全独立研发、具有自主知识产权的数据分析软件系统,成功定量研究了镍基高温合金GH3535母材与焊缝区域晶体取向、应变和显微缺陷等微观组织结构特征,并提出了后续线站优化设计方案.在未来工作中,将进一步提高空间分辨率,加入X射线荧光分析与原位测试装置.上海光源微束劳厄射线站将为材料科学研究提供更高的分辨率和更多的测试表征功能与能力.

关键词： synchrotron light source micro-Laue diffraction orientation/strain mapping peak profile analysis Ni-based superalloy

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