• Title/Summary/Keyword: Superconducting Magnet

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Repair Welding and Joint of KSTAR TF CICC (KSTAR TF Coil용 CICC 보수 용접 및 접합)

  • Lim, B.;Lee, S.;Kim, C.;Kim, D.;Choi, J.;Jung, W.;Park, H.;Chu, Y.;Park, K.;Baek, S.;Kim, K.
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2003.10a
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    • pp.304-306
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    • 2003
  • The KSTAR (Korea Superconducting Tokamak Advanced Research) superconducting magnet system which consists of 16 TF coils and 14 PF coils. The magnet system adopt a superconducting CICC (Cable-In-Conduit Conductor) type. The KSTAR TF CICC uses Nb$_3$Sn superconducting cable with Incoloy 908 conduit. To prepare for TF CICC jacket defect, repair welding of TF CICC is studied. And to confirm join method of TF CICC joint part, the welding method and the joint part design are also discussed.

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Fabrication of KSTAR PF CICC (KSTAR PF Coil용 CICC 제작)

  • Lim, B.;Lee, S.;Choi, J.;Jung, W.;Park, H.;Chu, Y.;Park, K.;Baek, S.;Kim, K.
    • Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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    • 2003.10a
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    • pp.301-303
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    • 2003
  • The KSTAR(Korea Superconducting Tokamak Advanced Research) superconducting magnet system consist of 16 TF(Toroidal Field) and 14 PF(Poloidal Field) coils. Internally-cooled cabled superconductors will be used for the magnet system. The magnet system adopt a superconducting CICC (Cable-In-Conduit Conductor) type. The KSTAR PF 6, 7 CICCs use NbTi Superconducting cable with stainless steel 316LN conduit while the other PF CICC use Incoloy 908 conduit. For the fabrication of PF CICC, superconducting cables have been fabricated and the cable has the diameter of 22.3mm. A continuous CICC jacketing system is developed for the CICC jacketing and the jacketing system uses the tube-mill process, which consists of forming, welding, sizing and squaring procedures. The cabling and the jacketing process is described. The welding condition and design specification of CICCs are also discussed. The fabrication results including the geometrical specification and the void fraction will be discussed.

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Development of a Conduction-Cooled Superconducting Magnet System for Material Separation (물질분리를 위한 전도냉각형 초전도자석 시스템 개발)

  • Choi, Y.S.;Kim, D.L.;Lee, B.S.;Yang, H.S.;Jung, W.M.
    • Progress in Superconductivity
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    • v.10 no.1
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    • pp.50-54
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    • 2008
  • A conduction-cooled superconducting magnet system is developed for material separation. The superconducting magnet for material separation has to be designed to have a strong magnetic field in a control volume. Since the magnetic field gradient is larger at the end rather than at the center of the magnet, we developed a design method to optimize the superconducting magnet for material separation. The safety of the superconducting magnet is evaluated, taking into account the electro-magnetic field, heat and structure. The superconducting coil is successfully wound by the wet-winding method. The superconducting coil is installed in a cryostat maintaining high vacuum, and cooled down to approximately 4 K by a two-stage GM cryocooler. The performance of the conduction-cooled superconducting magnet system is discussed with respect to the supplied current, cooling medium and cooling power of a cryocooler.

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Design and Development of 3 Tesla Superconducting Magnet (3 Tesla 초전도 전자석의 설계 및 시작)

  • 한송엽;차귀수;김순흠;김용권;최경달;강성수
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.35 no.1
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    • pp.36-43
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    • 1986
  • Superconducting magnet can be employed in many fields, such as, magnet for strong field, superconducting rotating machine and superconducting energy storage system. In this paper, the solenoid magnet design procedure and materials used in construction are described in detail, and those are the fundamentals of superconducting magnet study. The fabrication and test procedure of 3 Tesla superconduting magnet are also described. Nb-Ti is used as a superconducting wire, GFRP and Kapton are used for electrical insulation. Inner diameter of the magnet is 10 cm. According to the test results, the field at the central point of the magnet was 3 Tesla, evaporation rate per hour was 2.7 litter and current at that case was 315 A.

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Conductive link between cryocooler and magnet in cryogen-free LTS magnet system

  • Choi, Yeon Suk
    • Progress in Superconductivity and Cryogenics
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    • v.15 no.4
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    • pp.59-62
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    • 2013
  • The conductive link is used as a cooling medium between a cryocooler and magnet in a cryogen-free superconducting magnet system. The low temperature superconducting (LTS) magnet has one solenoidal configuration with a metal former which has a 52 mm room temperature bore. The superconducting coil is installed in the cryostat maintaining high vacuum and cooled by a two-stage cryocooler. In order to maintain the operating temperature of magnet at the designed level, the cold head temperature of the cryocooler must be lower so that heat can be removed from the superconducting coil. Also, temperature difference is occurred between the magnet and cryocooler and its magnitude is dependent upon the contact resistance at the interfacial surface between metals in the conductive link. In the paper, the performance of the LTS magnet is investigated with respect to the conductive link between the magnet former and the cold head of the cryocooler. The effects of the contact pressure and interfacial materials on the temperature distribution along the conductive link are also presented.

Experimental study on the interaction force between a permanent magnet and a superconducting roll stack

  • Wenxin Li;Tianhui Yang;Ying Xin
    • Progress in Superconductivity and Cryogenics
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    • v.25 no.1
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    • pp.11-15
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    • 2023
  • In recent years, the interaction force between a permanent magnet and a closed superconductor coil has been gradually investigated in depth. The principle and application potential of an energy storage/convertor composed of a magnet and a closed superconducting coil have been proved. However, the study on the force between a magnet and a non-closed superconducting coil (superconducting roll stack) has hardly been reported in previous literature. The behavior of this kind of interaction and its influence to the interaction force between a permanent and a closed superconducting coil are also still unclear. In this paper, first we investigated the interaction force between a magnet and a superconducting roll stack. Then, a series of experiments were designed and conducted to clarify the factors affected the interaction force, including the geometrical parameters of the superconducting roll stack and the magnetic field density at the roll stack. Moreover, the comparison of the interaction forces between the magnet and roll stack or a closed coil was also introduced.

Optimum Design Study on 0.5 MJ-Class Superconducting Pulse Magnet (0.5MJ 초전도 펄스 마그네트의 최적화 설계에 관한 연구)

  • 노완수;한송엽;황석영;이승원;홍원표
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.39 no.8
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    • pp.813-819
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    • 1990
  • In this paper, a new design method for superconducting pulse magnet is presented. Given energy storage capacity, magnet shape parameters are determined to minimize superconducting material quantity. Once the shape parameters are determined, cooling channel is designed and degradation characteristics are confirmed. According to the proposed magnet design concept, relatively uniform and low field distribution is obtained. Therefore, both the quantity of superconducting material and the mechanical load over magnet are reduced.

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A Study on Highly Homogeneous Double Helmholtz Superconducting Magnet and Newly Configurated Superconducting Magnet (고균일자계 Double Helmholtz형 및 삼개분리 원통형키전동자석에 관한 연구)

  • 이승원;권용안
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.37 no.8
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    • pp.521-527
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    • 1988
  • At present superconducting magnets have been feasible for many applications which require high field or highly homogeneous field that it is too difficult to be produced by conventional electromagnets. This paper is a stuny on Donble Helmholtz superconducting magnet and newly configurated superconducting magnet that realize highly homogeneous field with the minimum magnet volume. Nonlinear programming method is effectively used for the minimum volume of superconducting magnet that realizes the desired field intensity and high homogeneity. The results on Double Helmholtz and newly configurated superducting magnets that are presented in this paper are largely improved.

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Simulation of Quench in Pancake-shaped Superconducting Magnet Using a Quasi-three-dimensional Model

  • Wang, Qiuliang;Yoon, Cheon-Seog;Kim, Kee-Man
    • Progress in Superconductivity
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    • v.1 no.2
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    • pp.125-134
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    • 2000
  • A quench phenomenon is caused by an external disturbance in a superconducting magnet, where the magnet is operating in a cryogenic environment. The heat coupling between the layers and pancakes of the magnet can induce the normal zone propagation with fast speed. In order to analyze quench behavior in a pancake-shaped superconducting magnet, a quasi-three-dimensional model is proposed. A moving mesh finite volume method is employed in solving the heat conduction equation. The quench process of the superconducting magnet is studied under the various operating conditions and cooling conditions.

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The Characteristics of High Voltage Output Flux Pump for Superconducting Magnet (초전도 마그네트용 고출력 플럭스 펌프의 특성)

  • Choi, Kyeong-Dal;Hahn, Song-Yop;Tsukiji, Hiroshi;Hoshino, Tsutomu;Muta, Itsuya
    • Proceedings of the KIEE Conference
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    • 1996.07a
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    • pp.86-88
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    • 1996
  • Using superconducting magnetic flux pump, thick power leads for a superconducting magnet could be replaced with thin string leads for the excitation magnet to the superconducting flux pump. We have developed a new type flux pump with high voltage output to shorten the charge and discharge time of the load magnet. The test of four stacked disks as the excither for the load magnet has been carried out. This disk type flux pump yielded 70 mV of voltage across its terminal and 10 A of current through 85 mH load magnet which was the field winding of 20 kVA class fully superconducting generator within 12 seconds. This output voltage of the new superconducting flux pump is about 10 times larger than that of the previous work Moreover since it is easy to stack the disks for the superconduction flux pump, the high voltage exciter for the 1H class superconducting magnet would be expected to be made easily.

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