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Nuclear Science and Techniques 2024年第4期35卷 119-135页

作者： Chuang Shen Ying-Shun Zhu fu-san chen China Spallation Neutron Source Institute of High Energy PhysicsChinese Academy of Sciences1 Zhongziyuan RoadDongguan 523000China Institute of High Energy Physics Chinese Academy of Sciences19B Yuquan RoadBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Currently,three types of superconducting quadrupole magnets are used in particle accelerators:cos 2θ,CCT,and ***,all three coil configurations have complex spatial geometries,which make magnet manufacturing and strain-sensitive superconductor applications *** with the three existing quadrupole coils,the racetrack quadrupole coil has a simple shape and manufacturing process,but there have been few theoretical *** this paper,the two-dimensional and three-dimensional analytical expressions for the magnetic field in coil-dominated racetrack superconducting quadrupole magnets are *** analytical expressions of the field harmonics and gradient are fully resolved and depend only on the geometric parameters of the coil and current ***,a genetic algorithm is applied to obtain a solution for the coil geometry parameters with field harmonics on the order of 10^(-4).Finally,considering the practical engineering needs of the accelerator interaction region,electromagnetic design examples of racetrack quadrupole magnets with high gradients,large apertures,and small apertures are described,and the application prospects of racetrack quadrupole coils are analyzed.

关键词： Superconducting quadrupole magnet Racetrack coil Multipole field Genetic algorithm Magnetic design

Commissioning and operation of the cryostat for 3W1 SC wiggler

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Nuclear Science and Techniques 2023年第6期34卷 43-54页

作者： Miao-fu Xu Xiang-Zhen Zhang Rui Ye Jin-Can Wang Xiao-Juan Bian Yao Gao Min-Xian Li fu-san chen Xiao-chen Yang Rui Ge Institute of High Energy Physics Chinese Academy of SciencesBeijing100049China Key Laboratory of Particle Acceleration Physics and Technology Chinese Academy of SciencesBeijing100049China Center for Superconducting RF and Cryogenics Institute of High Energy PhysicsBeijing100049China University of Chinese Academy of Sciences Beijing100049China

A 3W1 superconducting wiggler(SCW)with the pole gap of 68 mm was successfully tested and installed in a BEPC II storage ring in November,*** goal of zero liquid helium consumption was achieved,and the cryogenic system exhibited a 12%residual cooling capacity(approximately 0.69 W@4.2 K).The 3W1-SCW was set to operate at 2.49 T and has been operating for more than seven *** instances of magnet quenching occurred during the normal *** evaporated helium gas can be recycled to the helium gas recycling system when the pressure in the helium tank is higher than the parameter value(the setpoint of the pressure value is 1.2 bara).The cryogenic system can be recovered within 4 h if sufficient liquid helium is available to inject into the cryostat.

关键词： Cryostat Commissioning SC wiggler Synchrotron radiation

Development of short prototype of dual aperture quadrupole magnet for CEPC ring

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Nuclear Science and Techniques 2023年第7期34卷 148-158页

作者： Mei Yang fu-san chen Ya-Feng Wu Zhuo Zhang Bao-Gui Yin Bin Na Zhan-Jun Zhang Institute of High Energy Physics Chinese Academy of SciencesBeijing 10049China Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China Beijing HE-Racing Technology Co. Ltd.Beijing 1000049China

Main quadrupole magnets are critical for the Circular Electron and Positron Collider(CEPC)and are specifically designed as dual aperture quadrupole(DAQ)***,the field crosstalk between the two apertures presents *** the CEPC will work at four beam energies of Z,W,Higgs and ttbar mode,the DAQ magnets will operate at four field gradients spanning from 3.18 to 12.63 T/*** first short quadrupole magnet prototype with the bore diameter of 76 mm and magnetic length of 1.0 m revealed the problems of large magnetic field harmonics and a magnetic center shift within the beam energy ***,a compensation method was proposed in this work to solve the field crosstalk *** adjusting the gap height at the middle of the two apertures,the field harmonics and magnetic center shift are significantly *** optimization,the short prototype was modified using a new *** field simulations are validated from the magnetic measurement ***,the multipole field meets the requirements of the four beam *** detailed magnetic field optimization,field harmonics adjustment,and measurement results are presented herein.

关键词： Dual aperture magnets Field measurements Crosstalk effect Quadrupole magnet Field harmonics CEPC

Study of implementing the FEC on SoC FPGA for digital quench detector

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Radiation Detection Technology and Methods 2018年第1期2卷 161-168页

作者： Jing-Xi Zhang fu-san chen Jian cheng Xiao-Juan Bian Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Science Beijing 100049China

Purpose Generally,the front-end computer(FEC)in a digital quench detector always acts as a communication platform between front-end data acquisition system and upper monitoring *** FPGA is the optimal option for building system on *** at developing a digital quench detector with higher integration degree,lower cost and stronger portability that meets the needs of different kinds of superconducting magnets,it is essential to develop a universal FEC based on SoC *** The development platform is Cyclone V SX SoC FPGA development board which has a FPGA integrated with an ARM *** hardware architecture of the FEC is built by using IP cores and developing custom function *** the other hand,the software design mainly consists of transplanting the embedded Linux and developing essential application program for communicating *** The main function of FEC is reading quench detection data and transferring it to upper monitor computer through Ethernet;the test results indicate that the system design is reasonable and the function is *** The implementing of FEC on SoC FPGA has set a proper platform for upgrading to support more function for digital quench detection,and it is feasible to integrate more discrete devices onto one piece of SoC FPGA.

关键词： SoC FPGA FEC ARM Embedded Linux Digital quench detector

Design, assembly, and pre-commissioning of cryostat for 3W1 superconducting wiggler magnet

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Nuclear Science and Techniques 2020年第11期31卷 78-92页

作者： Miao-fu Xu Xiang-Zhen Zhang Rui Ye fu-san chen Xiao-chen Yang Tong-Xian Zhao Shao-Peng Li Xian-Jing Sun Liang-Rui Sun Chang-cheng Ma Rui Ge Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Key Laboratory of Particle Acceleration Physics and Technology Chinese Academy of SciencesBeijing 100049China Center for Superconducting RF and Cryogenics Institute of High Energy PhysicsBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

One of the most important devices for the High Energy Photon Source Test Facility project,the 2.6 T 32-pole 3W1 superconducting wiggler,was designed by the Institute of High Energy Physics(IHEP);its magnetic gap is 68 mm,and its storage energy is 286 *** will be installed at the storage ring of the Beijing Electron Positron Collider Upgrade Project at the IHEP to replace the old permanent *** primary purpose of the cryostat is to create a safe and reliable system and realize long-term operation with zero liquid helium *** maintain liquid helium temperature,four identical two-stage cryocoolers are placed symmetrically at the wiggler *** cryostat has only one 60 K thermal shield,which is used to reduce the heat load to the liquid helium *** cryostat has several novel features,including a suspension system with little heat leakage that is self-centered during cooling of the cryostat,a special copper liner and high-efficiency condensers,three pairs of binary current leads,and three-level safety *** cryogenic system has been cooled three times,and the residual cooling capacity is approximately 0.41 W at 4.2 K without current.

关键词： Cryostat Cryocooler Superconducting wiggler Superconducting insertion device

Superconducting multipole wiggler with large magnetic gap for HEPS-TF

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Nuclear Science and Techniques 2022年第2期33卷 21-29页

作者： Xian-Jing Sun fu-san chen Xiang-chen Yang Wan chen Xiao-Juan Bian Min-Xian Li Rui Ge Miao-fu Xu Yao Gao Jin-Can Wang Hui-Hua Lu Jian-She Cao Zhi-Qiang Li Zhuo Zhang Rui Ye Xiang-Zhen Zhang Shuai Li Bao-Gui Yin Mei Yang Ling-Ling Gong Da-Heng Ji Lin Bian Ran Liang Ya-Jun Sun Hong Shi Institute of High Energy Physics Chinese Academy of SciencesBeijing 10049China Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China China Spallation Neutron Source Institute of High Energy PhysicsChinese Academy of SciencesDongguan 523803China

A 16-pole superconducting multipole wiggler with a large gap of 68 mm was designed and fabricated to serve as a multipole wiggler for *** wiggler consists of 16 pairs of NbTi superconducting coils with a period length of 170 mm,and its maximum peak field is 2.6 *** magnet design,magnet poles were ***,the Lorentz force on the coils and electromagnetic force between the upper and lower halves were computed and analyzed along with the stored energy and inductance at different *** enhance the critical current of the magnet coil,all the pole coils selected for the magnet exhibited excellent performance,and appropriate prestress derived from the coil force analysis was applied to the pole coils during magnet *** entire magnet structure was immersed in 4.2-K liquid helium in the cryostat cooled solely by four two-stage cryocoolers,and the performance test of the superconducting wiggler was appropriately *** on the measured results,the first and second field integrals on the axis of the superconducting wiggler were significantly improved at different field levels after the compensation of the corrector ***,the wiggler was successfully installed in the storage ring of BEPCII operation with beams.

关键词： Superconducting multipole wiggler Force analysis Quench protection Magnetic field measurement HEPS-TF Cryostat

Correction to:Development of short prototype of dual aperture quadrupole magnet for CEPC ring

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Nuclear Science and Techniques 2023年第7期34卷 267-268页

While typesetting the article,in the Figs.13 and 17 there were several errors *** correct Figs.13 and 17 are copied below:The original article has been corrected.

关键词： corrected quadrupole

Magnetic field strength and temperature-dependent calibration system of Hall probe for the HEPS-TF cryogenic permanent magnet undulator

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Radiation Detection Technology and Methods 2018年第1期2卷 128-135页

作者： Ling-Ling Gong Wan chen Wen Kang Lei Zhang Xiang-Zhen Zhang Shu-chen Sun fu-san chen Lei Wu Ya-Jun Sun Zhi-Qiang Li Yu-Feng Yang Hui-Hua Lu Xiao-Yu Li Shu-Tao Zhao Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China China Spallation Neutron Source(CSNS) Institute of High Energy Physics(IHEP)Chinese Academy of Sciences(CAS)Dongguan 523803China Dongguan Institute of Neutron Science(DINS) Dongguan 523808China

Purpose High energy photon source test facility(HEPS-TF)has manufactured a three-dimensional Hall probe to measure the cryogenic permanent magnet undulator(CPMU).Since the operating environment of the CPMU is the subcooled liquid nitrogen(85K),the temperature of the Hall probe will have a decrease of several degrees while carrying out the local magnetic *** established a magnetic field strength and temperature-dependent calibration system to calibrate the Hall *** The magnetic field strength of the Hall probe was calibrated by a standard dipole electromagnet and a nuclear magnetic resonance Tesla meter(NMR).The temperature of Hall probe was controlled by a control system which can modulate temperature from 0℃ to 30℃.Results A new homemade Hall probe has finished the temperature-dependent(0℃ to 30℃),magnetic field strength(-1.2 to 1.2 T)and angle error calibration at this new calibration *** temperature correction error is less than 0.045%.The calibration error of magnetic field strength is less than 1.5 *** RMS calibration error of Hall sensors angle matrix is less than *** The magnetic field strength and temperature-dependent calibration system including a standard dipole electromagnet,a temperature regulation system,an NMR and a five-dimensional Hall bench was *** detailed magnetic field strength and temperature-dependent calibration system is introduced and the results of the calibrations are presented.

关键词： Temperature calibration Cryogenic permanent magnet undulator Three-dimensional Hall probe Nuclear magnetic resonance Tesla meter

溶栓治疗对心肌梗死患者Th17及Treg细胞的影响

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中国免疫学杂志 2017年第3期33卷 441-444页

作者：郑三福陈宇翔郭伟溪王羽厦门大学附属第一医院杏林院区内科厦门361003 厦门大学附属第一医院检验科厦门361003 厦门大学附属第一医院普外科厦门361003 厦门大学附属第一医院超声影像科厦门361003

目的:观察心肌梗死患者溶栓前后体内Th17、Treg细胞及相关因子含量,从而探讨三者的相关性。方法:提取外周血单个核细胞,流式细胞术检测Th17及Treg含量,ELISA方法检测上清IL-17及TGF-β含量变化,实时定量PCR检测RORγT及Foxp3含量。结果... 详细信息

目的:观察心肌梗死患者溶栓前后体内Th17、Treg细胞及相关因子含量,从而探讨三者的相关性。方法:提取外周血单个核细胞,流式细胞术检测Th17及Treg含量,ELISA方法检测上清IL-17及TGF-β含量变化,实时定量PCR检测RORγT及Foxp3含量。结果:与对照组相比,实验组患者在溶栓前、后体内Th17细胞,IL-17及RORγT含量均显著升高;Treg细胞、TGF-β及Foxp3含量显著降低(P<0.05)。与实验组患者溶栓前相比,溶栓后7 d体内Th17细胞,IL-17及RORγT含量显著降低;Treg细胞、TGF-β及Foxp3含量显著升高(P<0.05)。结论:与对照组相比,心肌梗死患者体内中存在Th17及相关因子升高,Treg及相关因子降低,溶栓治疗后可使Th17及相关因子降低,Treg及相关因子升高。

关键词： Th17 Treg 溶栓治疗心肌梗死

Dynamic evolution of Co species and morphological reconstruction on Co-N-C during the nitrate reduction reaction in neutral solution

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Nano Research 2025年第1期18卷 164-172页

作者： Yuanlin fu Xiaoting Yang Ya Yu Kang Zhou Xiaoyang Ye Aoxiang Zhang Xiaojiao Hou Bingbing chen fuqiang Fan Yuhang Li Yu fu Department of Chemistry College of SciencesNortheastern UniversityShenyang 110819China Department of Physical Education Shen Yang Institute of Science and TechnologyShenyang 110167China Sungrow Power Supply Co. Ltd.Hefei 230088China

The electrochemical nitrate reduction reaction(eNO_(3)^(-)RR)is considered an effective approach for converting nitrate-containing wastewater to *** adsorption and activation of NO_(3)^(-)is the critical step for many materials and the high energy barrier inhibits the continuation of the reduction *** Co nanoparticles encapsulated in the carbon layer we prepared spontaneously react with NO_(3)^(-)and the resulting Co^(2+)is then reduced by electroreduction to Co^(0),which circulates *** resulted in overcoming the energy input required for NO_(3)^(-)adsorption and conversion,thereby increasing the catalytic *** the same time,the morphology of the catalyst reconstructed from a dodecahedron to an interwoven nanosheet structure and the increased surface area also gives it better *** obtained Co(OH)_(2)@Co-N-C has an excellent eNO_(3)^(-)RR of 2774.7μg·h^(-1)·cm^(-2)with a Faraday efficiency of 81.4%in neutral *** the same time,the material-modified electrode can run stably for more than 100 *** work provides a new idea for the design of Co-based catalysts for eNO_(3)^(-)RR.

关键词： electrochemical nitrate reduction reaction Co-based catalyst dynamic evolution of Co species morphological reconstruction