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Development of 5 T NbTi superconducting magnet with 160 mm Warm Bore for magnetic Separation

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Plasma Science and Technology 2008年第5期10卷 629-634页

作者：施毅武玉李少磊 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China

A wide-bore 5 T NbTi superconducting magnet, for magnetic separator, with an operational current of 106 A is designed and fabricated. This magnet with a Ф60 mm roomtemperature bore is installed in a vacuum cryostat and immersed in liquid helium. A two-stage 4 K Gifford-McMahon （GM） cryocooler is used to maintain the cooling shield at 70 K and the condenser at 4 K in order to achieve the zero vaporization loss of liquid helium. The cooling power of the GM cryocooler is 1.5 W. In this paper, the design, heat leakage, stress analysis, quench protection characteristics and preliminary test results are presented.

关键词： superconducting magnet zero vaporization loss stress analysis quench protection

Study on a Highly Stabilized Power Supply for Hybrid-magnet superconducting Outsert

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Plasma Science and Technology 2014年第9期16卷 890-896页

作者：吴景林龙佼佼刘小宁 University of Science and Technology of China High magnetic Field Laboratory Chinese Academy of Sciences

The superconducting outsert of the 40 T hybrid-magnet in High magnetic Field Laboratory （HMFL） of Chinese Academy of Sciences （CAS） requires a highly stabilized power supply. In this paper, two kinds of power supply design are briefly presented and both advantages and disadvantages are analyzed. In order to overcome the drawbacks of switching power supply, a series regulated active filter is adopted and a new design is proposed which ensures cooperative relationship between the feedback control loops of the switching converter and the series regulated active filter. Besides, unlike the traditional switching power supply, which can generate positive voltage only, this new design can also generate negative voltage which is needed in the quench protection for the superconducting magnet. In order to demonstrate the effectiveness of the methodology, a low-power prototype has been accomplished. The simulation and experiment results show that the power supply achieves high precision under the combined action of two feedback control loops. The peak-to-peak amplitude of the output ripple voltage of the prototype is 0.063%, while the peak-to-peak amplitude of the output ripple current is 120 ppm.

关键词： superconducting magnet switching power supply series regulating feedbackcontrol quench protection

Development of Experimental superconducting magnet for the Collector Ring of FAIR Project

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Plasma Science and Technology 2010年第2期12卷 248-252页

作者：朱银锋吴维越武松涛徐厚昌刘常乐 Institute of Plasma Physics Chinese Academy of Sciences School of Mechanical and Electrical Engineering Anhui University of Architecture Department of Mechanical Engineering Hefei University

A pool cooled experimental magnet based on the copper stabilized NbTi supercon- ducting wire was designed, fabricated and tested, in order to evaluate the engineering design of the dipole superconducting magnet for the collector ring （CR） of the facility for antiproton and ion research （FAIR） project. In this paper, the experimental setup including quench protection system was presented. Performance of the liquid helium pool cooled test was introduced. All of the results indicate both the performance of conductor and the experimental superconducting magnet under low temperature is stable, which suggests the engineering design are feasible for the formal magnet in CR of the FAIR project.

关键词： collector ring （CR） superconducting magnet cryogenic system quench pro- tection

The 5.8 T Cryogen-Free Gyrotron superconducting magnet System on HL-2A

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Plasma Science and Technology 2014年第4期16卷 410-414页

作者：夏冬辉黄梅周俊白兴宇郑铁流饶军庄革 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Southwestern Institute of Physics

A 5.8 T cryogen-free superconducting magnet （SCM） system with a warm bore hole of 160 mm in diameter, used for gyrotrons operating in the frequency range from 68 GHz to 140 GHz, is installed on the site of the HL-2A tokamak. The SCM consists of two separate solenoidal magnetic coils connected in series, a 4.2 K Gifford-McMahon （GM） refrigerator, a com- pressor, a coil power supply and two temperature monitors. The performance, test and preliminary experimental results of this SCM system are described in this paper. The magnetic field distribu- tion was measured along the axis, and a dummy tube was used for adjusting the magnet system. Finally, the magnet was used for the operation of a 68 GHz/500 kW gyrotron, which is part of an electron cyclotron resonance heating （ECRH） system. With an additional auxiliary coil and after adjusting tile magnet system, a maximum output power for the ECRH system of up to 400 kW was achieved.

关键词： ECRH gyrotron superconducting magnet cryogen free

Design of an asymmetric superconducting magnet for a Penning trap

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Chinese Physics C 2015年第5期39卷 105-108页

作者：卞文龙马力祯吴魏姚庆高关明智杜俊杰 Institution of Modern Physics Chinese Academy of Sciences University of Chinese Academy of Sciences

A new 7.0 T asymmetric active shield superconducting magnet for Penning traps is proposed in this work. The magnet has two field regions whose homogeneity is better than 0.5 ppm. Linear and nonlinear methods are used for the asymmetric electromagnetic optimization. Stress analysis, mechanical design and a quench protection system design are also introduced in this paper.

关键词： Penning trap superconducting magnet asymmetric active shield

The superconducting magnet for ADS injection-I

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Radiation Detection Technology and Methods 2019年第1期3卷 8-12页

作者： Xiang-chen Yang Quan-ling Peng Da Cheng Feng-yu Xu Yuan Chen An-bin Chen Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Harbin Institute of Technology Harbin 150006HeilongjiangChina

Purpose As the world energetic demand is increasing day by day,the development of nuclear energy is of great necessity.However,the development is followed by a lot of tough questions like the management and storage of the nuclear waste.ADS,which is short for the accelerator-driven sub-critical system,may be a good choice because it can provide an efficient transmutations of nuclear waste.Many countries have carried out some research in related areas like the USA,Japan and China.The superconducting magnet system The cryomodule I(CM1)for China’s ADS Injection-I had been designed,fabricated and online tested.The CM1 is mainly composed of superconducting spoke cavities,beam positionmonitors,cryogenic system and superconducting magnets.The superconducting magnet system,which includes the magnet and current leads,is aimed at focusing and correcting the proton beams.Conclusion Seven superconducting magnets and current leads for CM1 are successfully designed and manufactured.Structural strength meets design specifications,the field meets the design demands,and the online test shows that the magnets can work in a rather stable state.In this paper,the detailed design and installation of the superconducting magnets are presented.

关键词： CM1 superconducting magnet Current leads

Present Status of the KSTAR superconducting magnet System Development

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Plasma Science and Technology 2004年第5期6卷 2445-2450页

作者： Keeman Kim H.K.Park K.R.Park B.S.Lim S.I.Lee M.K.Kim Y.Chu W.H.Chung S.H.Baek J.Y.Cho H.Yonekawa A.Chertovskikh Y.B.Chang J.S.Kim C.S.Kim D.J.Kim N.H.Song K.P.Kim Y.J.Song I.S.Woo W.S.Han D.K.Lee Y.K.Oh K.W.Cho J.S.Park G.S.Lee H.J.Lee T.K.Ko S.J.Lee National NationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalKorea Atomic Energy Research InstituteDaejeonRepublic of KoreaYonsei UniversitySeoulRepublic of KoreaYonsei UniversitySeoulRepublic of Korea Fusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science

The mission of Korea superconducting Tokamak Advanced Research (KSTAR)project is to develop an advanced steady-state superconducting tokamak for establishing a scientificand technological basis for an attractive fusion reactor. Because one of the KSTAR mission is toachieve a steady-state operation, the use of superconducting coils is an obvious choice for themagnet system. The KSTAR superconducting magnet system consists of 16 Toroidal Field (TF) coils and14 Poloidal Field (PF) coils. Internally-cooled Cable-In-Conduit Conductors (CICC) are put into usein both the TF and PF coil systems. The TF coil system provides a field of 3.5 T at the plasmacenter and the PF coil system is able to provide a flux swing of 17 V-sec. The major achievement inKSTAR magnet-system development includes the development of CICC, the development of a full-size TFmodel coil, the development of a coil system for background magnetic-field generation , theconstruction of a large-scale superconducting magnet and CICC test facility. TF and PF coils are inthe stage of fabrication to pave the way for the scheduled completion of KSTAR by the end of 2006.

关键词： superconducting magnet KSTAR CICC

Early Studies of Superconductive Materials and superconducting magnet in China(1962～1966)

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Rare Metals 1993年第3期12卷 232-236页

作者：刘兵王新荣 The Graduate School Academia SinicaBeijing 100039China The Documentation and Information Center Academia SinicaBeijing 100080China

On the basis of the published literature and the interviews with some participants,this paper introduces the early history of the studies of superconductive materials and superconducting magnet during 1962～ 1966 in China,narrates the achievements of other relevant experimental and theoretical studies of superconductivity in that period briefly,and tries to give the authors' comments on that history.

关键词： History of Superconductive materials superconducting magnet

A superconducting wireless energiser based on electromechanical energy conversion

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Superconductivity 2023年第3期7卷 53-64页

作者： Hongye Zhang Tianhui Yang Francesco Grilli Wenxin Li Paul M.Tuohy Ying Xin Department of Electrical and Electronic Engineering The University of ManchesterManchester M139PLUnited Kingdom School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China Institute for Technical Physics Karlsruhe Institute of TechnologyKarlsruhe 76131Germany

A superconducting magnet(SM)can produce high magnetic fields up to a dozen times stronger than those generated by an electromagnet made of normal conductors or a permanent magnet(PM),and thus has attracted increasing research efforts in many domains including medical devices,large scientific equipment,transport,energy storage,power systems,and electric machines.Wireless energisers,e.g.,high temperature superconducting(HTS)flux pumps,can eliminate the thermal load from current leads and arc erosion of slip rings,and are thus considered a promising energisation tool for SMs.However,the time‐averaged DC output voltage in existing HTS flux pumps is generated by dynamic resistance:the dynamic loss is unavoidable,and the total AC loss will become significant at high frequencies.This study introduces a highly efficient superconducting wireless energizer(SWE)designed specifically for SMs.The SWE takes advantage of the inherent properties of a superconducting loop,including flux conservation and zero DC resistivity.Extensive theoretical analysis,numerical modelling exploiting the H‐ϕformulation,and experimental measurements were conducted to demonstrate the efficiency and efficacy of the novel SWE design.The electromechanical performance and loss characteristics of the SWE system have also been investigated.Compared to conventional HTS flux pumps,the proposed SWE has lower excitation loss,in the order of 10−1 mW,and thus can achieve a high system efficiency of no less than 95%.Furthermore,it has a simpler structure with higher reliability,considered ready for further industrial development.In addition to deepening the understating of the intricate electromechanical dynamics between magnetic dipoles and superconducting circuits,this article provides a novel wireless energisation technique for SMs and opens the way to step changes in future electric transport and energy sectors.

关键词： Wireless energisation superconducting magnet High temperature superconductor Electromechanical energy conversion Electric transport