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Metallographic investigationof first full-sizehigh-Jc Nb_(3)Sn cable-in-conduit conductor aftercyclicloadingtests

Superconductivity 2024年第1期9卷 1-8页

作者： Chao Dai Yunhao Liu Zichuan Guo Yu Wu Arend Nijhuis Tianjun Xue Zuojiafeng Wu jinggang qin Huainan New Energy Research Center Huainan 232000People’s Republic of China University of Twente EnergyMaterials and SystemsFaculty of Science and TechnologyEnschede 7500AENetherlands University of Science and Technology of China Hefei 230026People’s Republic of China Baiyin Non-ferrous Changtong Wire&Cable Co.Ltd BaiyinGansu 730900People’s Republic of China Longteng Mechanical and Electrical Co. LtdYiChun 336000People’s Republic of China

In order to verify the feasibility of applying high-Jc Nb_(3)Sn strand in fusion magnet,a full-size cable-in-conduit conductor(CICC)with short twist pitch(STP)cable pattern was manufactured and tested in SULTAN facility at SPC,*** levels of cyclic electromagnetic(EM)load were applied on the sample stepwise,no visible decrease of current sharing temperature(TcsT was observed until the EM load increased to 80 kA×10.8 T,after that the Tcs decreased dramatically with the EM cycles,which suggested that irreversible deformation,causing a change in the strain state,or even damage has occurred in the superconducting *** investigating the reason which caused the conductor performance degradation,the tested conductor was dissected for metallographic *** segments which subjected to different EM loads were extracted from one of the legs,the geometric feature changes of the cable cross-sections were analyzed and compared.A good correlation was found between the decrease of the Tcs and deformation of the cable cross section.A mass of cracks were found on the sub-elements of strands in the segment which subjected to highest EM load,but the amount of crack is much lower in other *** the analyses,it is speculated that the critical EM load which causes irreversible degradation is between 850 kN/m and 870 kN/m for this *** results could be a reference in high-Jc Nb_(3)Sn CICC design.

关键词： High‐Jc Nb_(3)Sn Cable‐in‐conduit conductor Metallography

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Mechanical effects: challenges for high-field superconducting magnets

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National Science Review 2023年第3期10卷 51-53页

作者： Xingyi Zhang jinggang qin the Department of Mechanics and Engineering Sciences College of Civil Engineering and Mechanics Lanzhou University the Institute of Plasma Physics Chinese Academy of Sciences

Due to its clean products and sufficient raw materials, fusion energy is expected to become one of the main solutions of the energy crisis and ensuring the sustainable development of human society,which is a long-term strategicfrontier *** promise offusion energy is to constrain the motion of high-temperature plasma by the high magnetic field generated by superconducting magnets, and then achieve controllable *** power is proportional to the fourth power of the magnetic field ***,future commercial fusion reactors need a higher magnetic field as the basis for sustainable development [1].

关键词： Superconducting magnets

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CFETR CSMC降温过程热工水力分析

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低温与超导 2024年第6期52卷 1-6,19页

作者：关晓晖胡立标刘方高硕尉秦经刚中国科学院合肥物质科学研究院合肥230031 中国科学技术大学合肥230026

中心螺线管模型线圈(CSMC)项目是为了解决中国聚变工程试验堆(CFETR)中心螺线管线圈研发与运行过程中的关键技术问题。CSMC线圈均由带中心冷却管的管内铠装电缆(CICC)绕制,采用超临界氦迫流冷却。CSMC磁体系统的冷质量巨大,其降温过程... 详细信息

中心螺线管模型线圈(CSMC)项目是为了解决中国聚变工程试验堆(CFETR)中心螺线管线圈研发与运行过程中的关键技术问题。CSMC线圈均由带中心冷却管的管内铠装电缆(CICC)绕制,采用超临界氦迫流冷却。CSMC磁体系统的冷质量巨大,其降温过程也非常复杂。本文根据ITER修正的Katheder经验公式分析导体摩擦系数,并进行质量流量迭代运算,最后基于能量守恒原理,对CSMC磁体系统从300 K降温至4.5 K的过程进行了分析与评估。结果表明,CSMC能在400个小时之内从300 K降温至4.5 K,研究结果将为实际降温过程提供参考。

关键词： CFETR CSMC 降温过程热工水力分析

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REBCO CORC电缆轴向拉伸性能研究

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低温与超导 2024年第5期52卷 20-24页

作者：王乐金环高明肖冠宇刘海红秦经刚中国科学院等离子体物理研究所合肥230031 中国科学技术大学合肥230026

CORC(Conductor On Round Core)型电缆在高场下具有高载流和良好的机械性能,是制备聚变堆高场CS磁体最具潜力的电缆结构之一。但在制备过程中的穿缆拉力与运行过程中电磁力在电缆上的轴向分力会导致电缆性能发生衰退。为了研究CORC型电... 详细信息

CORC(Conductor On Round Core)型电缆在高场下具有高载流和良好的机械性能,是制备聚变堆高场CS磁体最具潜力的电缆结构之一。但在制备过程中的穿缆拉力与运行过程中电磁力在电缆上的轴向分力会导致电缆性能发生衰退。为了研究CORC型电缆在液氮、自场环境下临界电流与拉力、应变的关系,设计并搭建了一套电缆轴向拉伸通电测试装置,对基于上海超导YBCO带材制备的CORC哑缆进行测试,研究结果表明,在0~9 kN递增的轴向拉力下,n值呈均匀减小趋势。以95%IC0点作为临界电流衰退点,样品1的临界拉力为5 kN、临界应变为2.70%;样品2的临界拉力为7.4 kN、临界应变为7.20%。研究结果将为CORC型电缆穿缆工艺与运行工况提供数据支持。

关键词：高温超导 REBCO带材 CORC电缆轴向拉伸

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Bi-2212低电阻接头制备与低温实验测试

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低温与超导 2024年第3期52卷 24-30,46页

作者：朱华锦周孟良万佳昊杨东昇秦经刚周超汪键高鹏安徽理工大学机械工程学院淮南232001 合肥综合性国家科学中心能源研究院合肥230001 中国科学院等离子体物理研究所合肥230031

低电阻接头的制备及应用有利于提升超导磁体的稳定性及磁场质量,本文利用高温银线烧结法制备了Bi-2212低电阻接头,利用低温材料测试平台对Bi-2212不同压缩扁样的临界电流和高温银线烧结接头进行测试,并分析磁场强度、接触长度、搭接面... 详细信息

低电阻接头的制备及应用有利于提升超导磁体的稳定性及磁场质量,本文利用高温银线烧结法制备了Bi-2212低电阻接头,利用低温材料测试平台对Bi-2212不同压缩扁样的临界电流和高温银线烧结接头进行测试,并分析磁场强度、接触长度、搭接面积等关键因子对接头电阻的影响。实验结果表明:采用新型接头制备工艺研制的Bi-2212接头,当长度达到30 mm,搭接面积达到32.7 mm^(2)时,在4.2 K、5 T背场环境下接头电阻可降至4.5×10^(-8)Ω,并趋于稳定,且磁场对其影响可忽略不计。

关键词： Bi-2212 低电阻接头高温银线烧结法

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Bending performance analysis on YBCO cable with high flexibility

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Superconductivity 2023年第3期7卷 27-33页

作者： Huan Jin Qiong Wu Guanyu Xiao Chao Zhou Haihong Liu Yunfei Tan Fang Liu jinggang qin Institute of Plasma Physics Chinese Academy of SciencesPO Box 1126HefeiAnhui 230031China Institute of Energy Hefei Comprehensive National Science CenterHefeiAnhui 230031China Wuhan National High Magnetic Field Center Huazhong University of Science and TechnologyWuhan 430074China University of Science and Technology of China No.96JinZhai Road Baohe DistrictHefeiAnhui 230026China

In order to utilize high‐temperature superconducting Yttrium Barium Copper Oxide(YBCO)tapes to develop superconducting cables for high magnet field applications,it is critical to ensure the stable operation of the YBCO cable under challenging mechanical and thermal conditions.A new type of cable featuring the winding of YBCO and copper tapes around a spiral stainless steel tube has been proposed to increase flexibility and *** are performed to confirm that its critical current varies with the bending *** cables wound with nine YBCO tapes in three layers show a critical current degradation of less than 5%for a bending diameter of 30 *** performance of the cable degrades as the number of wound layers *** critical current degradation of cable specimens wound from 15 tapes in five layers reached approximately 12%for a bending diameter of 30 *** addition,when compared to traditional CORC cable specimens,the developed cable specimens show better‐bending flexibility and achieve a lower critical bending *** finite element models show that the higher elasticity coefficient and lower plasticity of the stainless steel spiral tube results in a lower strain on the YBCO tapes of the HFRC cable than that of the CORC cable,and the maximum strain on the YBCO tapes of the HFRC cable was only about 10%of that of the CORC ***,it is less likely that the YBCO tape in this type of cable will reach the irreversible strain limit during bending,resulting in a degradation in current carrying ***,the cooling efficiency can be improved by flowing the cooling medium inside the central core,which can significantly improve its thermal *** advantages indicate the possibility of using it in future high‐field magnets with high current carrying capacity at fields greater than 15 T.

关键词： YBCO cable Flexibility Bending performance Cooling efficiency

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AC loss and contact resistance in highly flexible rebco cable for fusion applications

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Superconductivity 2022年第2期2卷 39-45页

作者： Zichuan Guo jinggang qin R.Lubkemann Keyang Wang Huan Jin Guanyu Xiao Jiangang Li Chao Zhou Arend Nijhuis University of Twente Faculty of Science&Technology7522 NB EnschedeThe Netherlands University of Science and Technology of China HefeiAnhui 230026People’s Republic of China Institute of Plasma Physics Chinese Academy of SciencesHefeiAnhui 230031People’s Republic of China Department of Mechanics and Engineering Science Lanzhou UniversityLanzhouGansu 730000People's Republic of China

High Temperature Superconductor(HTS)materials can operate at higher magnetic fields up to 20 T with high critical current and higher operating temperature,compared to low temperature superconductors(LTS).A Highly Flexible REBCO Cable(HFRC)is introduced at the Institute of Plasma Physics,Chinese Academy of Sciences(ASIPP);a cabling method that is suitable for REBCO HTS tape having anisotropic material properties in its thin REBCO *** type of HTS superconducting cable shows high potential for applications in nuclear *** alternating currents and magnetic fields in tokamak type of fusion magnets,cause AC power losses in such cables,which can provoke instability of the conductor by induced currents and increase the *** a first step in characterizing the electromagnetic(EM)performance of an HFRC cable,the AC loss and contact resistance of the HFRC prototype cable were measured at the University of *** measurements were done in liquid helium(4.2 K)with AC magnetic fields,applied perpendicular to the cable's long *** AC loss was measured simultaneously by a calibrated gas flow calorimeter utilizing the helium boil-off method,and by the magnetization method using pick-up *** the applied test conditions,no coupling loss could be distinguished as a part of the overall AC *** is suggested that this might be explained by the shielding of the conductor interior from the applied magnetic field by the outer tape layer due to the high critical current density of the REBCO tape,leading to a high penetration field.

关键词： High temperature superconductor REBCO tape HFRC AC loss Contact resistance

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Recent progress in Chinese fusion research based on superconducting tokamak configuration

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The Innovation 2022年第4期3卷 61-73页

作者： Jinxing Zheng jinggang qin Kun Lu Min Xu Xuru Duan Guosheng Xu Jiansheng Hu Xianzu Gong qing Zang Zhihong Liu Liang Wang Rui Ding Jiming Chen Pengyuan Li Lei Xue Lijun Cai Yuntao Song Institute of Plasma Physics Hefei Institute of Physical ScienceChinese Academy of SciencesHefei 230031China Southwestern Institute of Physics Chengdu 610041China

Fusion energy is a promising source of clean energy,which could solve energy shortages and environmental *** into controlled fusion energy has been ongoing for over half a *** has created a clear roadmap for magnetic confinement fusion development,where superconducting tokamaks will be used in commercial fusion *** Experimental Advanced Superconducting Tokamak(EAST)is the world’s first fully superconducting tokamak with upper and lower divertors,which aims at longpulse,steady-state,H-mode operation,and 101-s H-mode discharge had been *** 2007,China joined the International Thermonuclear Experimental Reactor(ITER)and became one of its seven *** procurement packages are undertaken by China,covering superconducting magnets,power supplies,plasma-facing components(PFCs),diagnostics,*** bridge the gap between the ITER and fusion demonstration power plants(DEMOs),China is planning to build the Chinese Fusion Engineering Testing Reactor(CFETR)to demonstrate related technologies and physics *** engineering design of the CFETR was completed in 2020,and Comprehensive Research Facilities for Fusion Technology(CRAFT)are being constructed to explore the key technologies used in the CFETR.

关键词： tokamak configuration covering

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ITER MB超导电缆结构数值模拟研究

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低温与超导 2016年第3期44卷 32-37页

作者：曹靖刘勃秦经刚天津理工大学理学院天津730900 中国科学院等离子体物理研究所合肥230031 宝胜科技创新股份有限公司宝应225800

国际热核试验堆(International Thermonuclear Experimental Reactor,简称ITER)采用超导母线(Main Busbar,简称MB)连接磁体线圈和电流引线,传递整个磁体系统所需的电流。MB导体主要采用管内电缆导体(Cable-in-Conduit Conductor,简称CICC),CICC导体的主要结构是超导电缆,超导电缆是由超导线与铜线经过多级绞制而成。利用数值模拟方法给出了MB超导电缆的空间结构,并根据空间模拟结果给出了电缆绞制过程中的模具尺寸。

关键词： ITER MB 超导电缆数值模拟电缆空间结构

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高温超导电缆结构数值模拟研究

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低温与超导 2016年第10期44卷 44-48页

作者：张洪伟秦经刚天津师范大学数学科学学院天津300387 中科院等离子体物理研究所合肥230031 宝胜科技创新股份有限公司宝应225800

高温Bi-2212超导线是目前高温超导材料中唯一可以制成圆线的超导材料,这为使用其绞制超导电缆、制备CICC导体提供了可能性。Bi-2212属于陶瓷性材料,其力学性能较差。力学性能是其关键的参数要求。文中利用数值模拟方法,开展了高温Bi-221... 详细信息

高温Bi-2212超导线是目前高温超导材料中唯一可以制成圆线的超导材料,这为使用其绞制超导电缆、制备CICC导体提供了可能性。Bi-2212属于陶瓷性材料,其力学性能较差。力学性能是其关键的参数要求。文中利用数值模拟方法,开展了高温Bi-2212超导电缆的力学性能研究。

关键词： Bi-2212超导线高温超导电缆数值模拟

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