EP0625281A1 - Ruban supraconducteur stable resistant au saut de flux et aimant supraconducteur - Google Patents

Ruban supraconducteur stable resistant au saut de flux et aimant supraconducteur

Info

Publication number
EP0625281A1
EP0625281A1 EP94903335A EP94903335A EP0625281A1 EP 0625281 A1 EP0625281 A1 EP 0625281A1 EP 94903335 A EP94903335 A EP 94903335A EP 94903335 A EP94903335 A EP 94903335A EP 0625281 A1 EP0625281 A1 EP 0625281A1
Authority
EP
European Patent Office
Prior art keywords
conductor
superconducting magnet
coil
superconducting
layers
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94903335A
Other languages
German (de)
English (en)
Inventor
John Jerome Wollan
Bu-Xin Xu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Publication of EP0625281A1 publication Critical patent/EP0625281A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
    • H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Definitions

  • This invention relates to a stable Nb,Sn superconducting tape and magnet wound with that tape which resist flux jumping.
  • Superconducting magnets find wide application, for example, in the field of magnetic resonance imaging.
  • a magnet can be made superconducting by placing it in an extremely cold environment, such as by enclosing it in a cryostat or pressure vessel containing liquid helium or other cryogen.
  • the extreme cold reduces the resistance in the magnet coils to negligible levels, such that after a power source, initially connected to the coil to introduce a current into the coils, is removed the current will continue to flow through the coils due to the negligible resistance, thereby maintaining a magnetic field.
  • a superconducting magnet quench not only causes a disruption of service and use of the superconducting magnet and the MRI equipment, but also a time-consuming and expensive replenishment of the liquid helium cryogen and subsequent ramping up of the superconducting magnet is required. There is obviously a significant problem in such downtime and disruption of service of the MRI equipment. Moreover, the person who normally operates the MRI equipment is generally not trained or competent to reinstitute the superconducting mode of operation, requiring an expert or MRI technician be brought in to restart the superconducting magnet.
  • flux jumping is the quick motion of magnetic flux in a superconductor which causes undesirable heating, which raises the temperature of the superconductor and can result in the discontinuance of the superconducting mode. Flux jumping has been described as a kind of electromagnetic thermal instability affecting all high-field superconductors.
  • Nb j Sn is very attractive for use in superconducting magnets because of its higher critical current density, higher critical temperature, and higher critical field; however, the practical application of NbjSn has been very limited because it is very brittle and difficult to handle and use in fabricating superconducting magnet coils.
  • Nb j Sn tape helps to mitigate the brittleness problem, but has another inherent problem; it is not stable and suffers flux jumping in the conductor at the low temperature (4.2K) of boiling helium due to its high critical current.
  • any use with boiling helium cooling requires a conductor which is practical to manufacture and use, and which is, however, stable at boiling helium temperature and resistant to flux jumping and magnet quenching.
  • utilization of the desirable properties of Nb-jSn as compared to NbTi, namely a much higher critical current density, higher critical temperature and higher critical field, can provide superconducting magnets with equivalent performance but at a reduced cost because of the higher current density.
  • a stabilized superconducting magnet utilizes a superconducting magnet coil wound with NbjSn tape conductor.
  • a pair of copper stabilizing layers are bonded to the NbjSn tape, which is approximately 3 mm wide, and paper insulation surrounds this sandwich conductor to enable epoxy encapsulation after winding of the magnet coil.
  • the copper stabilizing layers are at least 0.30 mm thick, and the coil is wound in layers on a coil bobbin with a stainless steel tape wound around the exterior of the coil to restrain conductor motion.
  • the tape conductor utilizes stabilizing layers approximately 0.075 millimeters (mm) thick with copper or pure aluminum foil 0.50 mm thick inserted between adjacent layers of the superconducting magnet coil.
  • FIG. 1 is a cross-sectional view of a superconducting tape conductor fabricated in accordance with the present invention.
  • FIG. 2 is a cross-sectional view of a coil incorporating the conductor of FIG. 1.
  • FIG. 3 is a diagram illustrating the fabrication and use of the superconducting tape of FIGS. 1 and 2.
  • B p is the penetration field
  • J c is the critical current density of superconductor
  • a is the width of superconductor tape
  • d is the thickness of superconductor tape
  • c is the inter-layer distance between superconductor layers in coil winding including copper stabilizer and insulation.
  • conductor 1 is an NbjSn tape or ribbon conductor, in the order of one inch wide.
  • Conductor 1 is sandwiched between copper layers 2 and 3, the thickness of each being 0.3 mm or greater.
  • the Nb 3 Sn conductor 1 is 0.025 mm thick. In the preferred embodiment this is accomplished by passing NbjSn conductor 1 and copper ribbons 2 and 3, which are also in the order of 1 inch wide, through a solder bath in which they are pressed and soldered together to form a composite tape.
  • the layers of copper 2 and 3 could be annealed through pressure applied to the sandwich or alternatively could be plated on.
  • a suitable method forming sandwich ribbon conductor 10 in a solder bath is disclosed in copending patent application serial number (15-NM-3769/3781) entitled "Method and Apparatus for Laminating Foils Into a Superconducting Tape for Use in a Superconducting Magnet", assigned to the same assignee as the present invention and hereby incorporated by reference.
  • the sandwich formed by NbjSn conductor 22 and copper layers 2 and 3 is then sliced into individual conductors 25 3 mm wide, and wrapped with 0.040 mm thickness insulating paper 26.
  • the stable ribbon conductor 10 is then wound on coil form or bobbin 11 as shown in FIG. 2.
  • An annular recess 13 in bobbin 11 about the circumference thereof forms an annular pocket in which the NbjSn ribbon conductor 1 is wound in layers such as 34, 35 and 36.
  • copper or pure aluminum foils 37 and 38 approximately 0.5 mm thick are inserted between adjacent layers such as 34, 35 and 36.
  • the tape conductor is sandwiched between copper layers 2 and 3, 0.7 mm thick.
  • a stainless steel tape 17 is then wrapped around coil 14 to restrain motion of conductor l within superconducting coil assembly 15.
  • the superconductor tape and superconducting magnets of the present invention have been demonstrated to be stable in operation, resistant to flux jumping and resistant to random and undesired magnet quenching.
  • the copper stabilizing layers 2 and 3 provide an alternate or parallel path for current flow under fault conditions in which the superconducting material or tape 1 would otherwise quench.
  • tape conductor 10 has proven to be sufficiently flexible for winding into superconducting magnet coils using conventional winding equipment, and enabling the fabrication of reduced cost superconducting magnet coils. While the present invention has been described with respect to certain preferred embodiments thereof, it is to be understood that numerous variations in the detail of construction, the arrangement and combination of parts, and the type of materials used may be made without departing from the spirit and scope of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

L'invention concerne un ruban supraconducteur (10) stable, résistant au saut de flux, destiné à un aimant supraconducteur formé dans un sandwich de couches de cuivre (2, 3) autour d'un supraconducteur Nb3Sn (1). On peut insérer une feuille d'aluminium ou de cuivre entre les couches adjacentes de la bobine.
EP94903335A 1992-12-03 1993-12-01 Ruban supraconducteur stable resistant au saut de flux et aimant supraconducteur Withdrawn EP0625281A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US98481992A 1992-12-03 1992-12-03
US984819 1992-12-03
PCT/US1993/011557 WO1994012991A1 (fr) 1992-12-03 1993-12-01 Ruban supraconducteur stable resistant au saut de flux et aimant supraconducteur

Publications (1)

Publication Number Publication Date
EP0625281A1 true EP0625281A1 (fr) 1994-11-23

Family

ID=25530914

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94903335A Withdrawn EP0625281A1 (fr) 1992-12-03 1993-12-01 Ruban supraconducteur stable resistant au saut de flux et aimant supraconducteur

Country Status (3)

Country Link
EP (1) EP0625281A1 (fr)
JP (1) JPH07504068A (fr)
WO (1) WO1994012991A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2308490A (en) * 1995-12-18 1997-06-25 Oxford Instr Ltd Superconductor and energy storage device
JP2002270422A (ja) * 2001-03-08 2002-09-20 Toshiba Corp 超電導装置および超電導装置の冷却システム
US7139641B2 (en) * 2003-03-27 2006-11-21 Taiwan Semiconductor Manufacturing Co., Ltd. Wafer protection system
JP5342749B2 (ja) * 2007-03-28 2013-11-13 株式会社東芝 高温超電導コイル
CN118197732B (zh) * 2024-05-14 2024-07-16 西北工业大学 一种超导磁体及磁通跳跃抑制方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6607640U (de) * 1965-10-16 1971-03-25 Siemens Ag Bandfoermiger supraleiter.
GB1247319A (en) * 1969-04-29 1971-09-22 Gen Electric Improvements in process for making superconductors
JPS63289907A (ja) * 1987-05-22 1988-11-28 Hitachi Ltd 超電導体コイル
JPH0382105A (ja) * 1989-08-25 1991-04-08 Furukawa Electric Co Ltd:The 酸化物超電導コイルの製造方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9412991A1 *

Also Published As

Publication number Publication date
JPH07504068A (ja) 1995-04-27
WO1994012991A1 (fr) 1994-06-09

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