JPH0786642A - Conduction cooling superconduction magnet device - Google Patents
Conduction cooling superconduction magnet deviceInfo
- Publication number
- JPH0786642A JPH0786642A JP5225637A JP22563793A JPH0786642A JP H0786642 A JPH0786642 A JP H0786642A JP 5225637 A JP5225637 A JP 5225637A JP 22563793 A JP22563793 A JP 22563793A JP H0786642 A JPH0786642 A JP H0786642A
- Authority
- JP
- Japan
- Prior art keywords
- superconducting
- magnet device
- cooling stage
- cooling
- current lead
- 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.)
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- Containers, Films, And Cooling For Superconductive Devices (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、伝導冷却型超電導磁石
装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conduction cooling type superconducting magnet device.
【0002】[0002]
【従来の技術】従来の伝導冷却型超電導磁石装置には、
冷凍機と、該冷凍機により冷却可能とした超電導コイル
と、該超電導コイルに給電する電流リードとを含むもの
がある(例えば、特願平3−104042号)。2. Description of the Related Art A conventional conduction cooling type superconducting magnet device is
Some include a refrigerator, a superconducting coil that can be cooled by the refrigerator, and a current lead that supplies power to the superconducting coil (for example, Japanese Patent Application No. 3-104042).
【0003】また、上述の伝導冷却型超電導磁石装置に
おいて、電流リードを酸化物高温超電導体で構成したも
のも従来存在する。Further, in the above-mentioned conduction cooling type superconducting magnet device, there is a conventional one in which the current lead is composed of an oxide high temperature superconductor.
【0004】[0004]
【発明が解決しようとする課題】この様に、従来、超電
導コイルに給電する電流リードを酸化物高温超電導体に
より構成することが行われているが、酸化物高温超電導
体の臨界電流は、外部磁場により大幅に低下することが
知られている。As described above, conventionally, the current lead for feeding the superconducting coil has been constituted by the high temperature oxide superconductor, but the critical current of the high temperature oxide superconductor is It is known to be greatly reduced by the magnetic field.
【0005】従って、各種超電導コイルの電流リードと
して酸化物高温超電導体を用いる場合には、超電導磁石
からの漏れ磁場に対して何らかの磁気シールドを施すこ
とにより臨界電流の低下を防止する必要がある。Therefore, when an oxide high temperature superconductor is used as a current lead of various superconducting coils, it is necessary to prevent the critical current from decreasing by providing some kind of magnetic shield against the leakage magnetic field from the superconducting magnet.
【0006】それ故に、本発明の課題は、電流リードに
おける臨界電流の低下を防止した伝導冷却型超電導磁石
装置を提供することにある。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a conduction cooling type superconducting magnet device which prevents a decrease in critical current in a current lead.
【0007】[0007]
【課題を解決するための手段】本発明によれば、冷凍機
と、該冷凍機により冷却可能とした超電導コイルと、該
超電導コイルに給電する電流リードとを含み、該電流リ
ードが酸化物高温超電導体により構成されている伝導冷
却型超電導磁石装置において、前記冷凍機の冷却ステー
ジに前記超電導コイルを接触させるとともに、前記電流
リードの外周に超電導磁気シールドを設け、該超電導磁
気シールドは、金属系超電導材料から構成され、且つ前
記冷却ステージに接触させてあることを特徴とする伝導
冷却型超電導磁石装置が得られる。According to the present invention, a refrigerator, a superconducting coil that can be cooled by the refrigerator, and a current lead for supplying power to the superconducting coil are provided, and the current lead has a high oxide temperature. In a conduction cooling type superconducting magnet device composed of a superconductor, the superconducting coil is brought into contact with the cooling stage of the refrigerator, and a superconducting magnetic shield is provided on the outer circumference of the current lead, and the superconducting magnetic shield is made of metal. A conduction cooling type superconducting magnet device is obtained which is made of a superconducting material and is in contact with the cooling stage.
【0008】[0008]
【作用】本発明においては、電流リードの外周に金属系
超電導体から成る超電導磁気シールドを設け、この超電
導磁気シールドを冷凍機により超電導コイルとともに冷
却するようにしたので、低温となった超電導磁気シール
ドによって電流リードに対する磁気シールドを効率良く
行うことができる。In the present invention, the superconducting magnetic shield made of a metallic superconductor is provided on the outer circumference of the current lead, and this superconducting magnetic shield is cooled together with the superconducting coil by the refrigerator. Thus, the magnetic shield for the current lead can be efficiently performed.
【0009】[0009]
【実施例】次ぎに、本発明の一実施例による伝導冷却型
超電導磁石装置を図1乃至図3に基づき説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a conduction cooling type superconducting magnet device according to an embodiment of the present invention will be described with reference to FIGS.
【0010】図1は伝導冷却型超電導磁石装置の一部縦
断面図である。この伝導冷却型超電導磁石装置1は、基
台2と、真空容器(クライオスタット)3と、熱シール
ド板4と、超電導コイル5と、正負極一対の高温超電導
電流リード6と、蓄冷式冷凍機7と、外部電源8とを有
する。FIG. 1 is a partial longitudinal sectional view of a conduction cooling type superconducting magnet device. This conduction cooling type superconducting magnet device 1 includes a base 2, a vacuum container (cryostat) 3, a heat shield plate 4, a superconducting coil 5, a pair of positive and negative high temperature superconducting current leads 6, and a cold storage refrigerator 7. And an external power supply 8.
【0011】真空容器3は、真空としたその内部に熱シ
ールド板4と、超電導コイル5と、高温超電導電流リー
ド6と、蓄冷式冷凍機7の第1段冷却ステージ7A及び
第2段冷却ステージ7Bとを収容している。The vacuum container 3 is evacuated and has a heat shield plate 4, a superconducting coil 5, a high-temperature superconducting current flow lead 6, a first cooling stage 7A and a second cooling stage of the cold storage refrigerator 7. And 7B.
【0012】熱シールド板4は、蓄冷式冷凍機7の第1
段冷却ステージ7Aに接触固定するとともに、その内部
の超電導コイル5及び高温超電導電流リード6への熱侵
入を防止している。The heat shield plate 4 is the first of the cold storage type refrigerator 7.
While being fixed in contact with the stage cooling stage 7A, heat is prevented from entering the superconducting coil 5 and the high temperature superconducting current lead 6 inside thereof.
【0013】超電導コイル5は、コイル巻き枠9に超電
導線材10を巻いたもので、その外周に冷却促進部材と
して外周冷却用銅ブロック11を締め付けてある。The superconducting coil 5 is formed by winding a superconducting wire 10 around a coil winding frame 9, and an outer periphery cooling copper block 11 is fastened to the outer periphery thereof as a cooling promoting member.
【0014】コイル巻き枠9は、巻芯9A、及びこの巻
芯9Aの上下両端部に一体形成した端部フランジ9Bか
ら構成されている。The coil winding frame 9 comprises a winding core 9A and end flanges 9B integrally formed at both upper and lower ends of the winding core 9A.
【0015】この外周冷却用銅ブロック11及びコイル
巻き枠9を蓄冷式冷凍機7の第2段冷却ステージ7Bに
接触固定することにより、超電導線材10を効率的に極
低温まで冷却可能としてある。By fixing the outer peripheral cooling copper block 11 and the coil winding frame 9 to the second stage cooling stage 7B of the regenerator 7, the superconducting wire 10 can be efficiently cooled to a cryogenic temperature.
【0016】図2はこの外周冷却用銅ブロック11の具
体的構成を示す一部切欠縦断面図、図3は図2のIII −
III 線断面図である。外周冷却用銅ブロック11は、円
周方向に等角度間隔で分割することにより任意の数、例
えば三つの円弧状単位ブロック部11A,11B,11
Cから構成されている。FIG. 2 is a partially cutaway vertical sectional view showing a concrete structure of the copper block 11 for cooling the outer periphery, and FIG.
It is a sectional view taken along line III. The outer peripheral cooling copper block 11 is divided into an equal number of intervals in the circumferential direction, for example, an arbitrary number, for example, three arc-shaped unit block portions 11A, 11B, 11.
It is composed of C.
【0017】円弧状単位ブロック部11A,11B,1
1Cの互いの間には、クエンチ時のうず電流を防止する
ための最低1個のうず電流防止用電気絶縁材12、及び
銅シート13を介在させるとともに、ボルト14により
超電導線材10の外周から所定締付け力で締め付け、互
いの密着性を高めて熱接触性を向上させてある。Arc-shaped unit block portions 11A, 11B, 1
At least one eddy current preventing electric insulating material 12 for preventing eddy current at the time of quench and a copper sheet 13 are interposed between the 1C's, and a predetermined amount is provided from the outer circumference of the superconducting wire 10 by bolts 14. It is tightened with a tightening force to improve mutual contact and improve thermal contact.
【0018】尚、シム(図示せず)による厚さ調整を行
うことによりこの密着性を調整することもできる。The adhesion can be adjusted by adjusting the thickness with a shim (not shown).
【0019】また、外周冷却用銅ブロック11と超電導
線材10との間に良熱伝導性の低温グリースを充填して
も良い。Further, a low temperature grease having good thermal conductivity may be filled between the outer peripheral cooling copper block 11 and the superconducting wire 10.
【0020】図1に戻って、高温超電導電流リード6
は、その正負極一対を設けてあり、電流リード端子15
及び常電導電流リードワイヤ16を介して外部電源8に
接続してあり、その高温側端部を蓄冷式冷凍機7の第1
段冷却ステージ7Aに、低温側端部を第2段冷却ステー
ジ7Bにそれぞれ取り付けてある。この高温超電導電流
リード6は、酸化物高温超電導体から成る。Returning to FIG. 1, high-temperature superconducting current lead 6
Is provided with a pair of positive and negative electrodes, and the current lead terminal 15
And an external power source 8 through a normal conducting current lead wire 16, and the end on the high temperature side is the first of the regenerator type refrigerator 7.
The low temperature side end portion is attached to the second cooling stage 7A and the second cooling stage 7B is attached to the second cooling stage 7A. The high-temperature superconducting current lead 6 is made of an oxide high-temperature superconductor.
【0021】蓄冷式冷凍機7は、GM冷凍機等の任意の
冷凍機であって、その第1段冷却ステージ7Aは、液体
窒素温度77K付近まで冷却可能であり、第2段冷却ス
テージ7Bは、極低温4〜10Kまで冷却可能としてあ
る。The regenerator 7 is an optional refrigerator such as a GM refrigerator, the first stage cooling stage 7A of which can cool to a liquid nitrogen temperature of around 77K and the second stage 7B of which can cool. It is possible to cool to an extremely low temperature of 4 to 10K.
【0022】従って、常電導電流リードワイヤ16が真
空容器3の常温(300K)部分から蓄冷式冷凍機7の
第1段冷却ステージ7Aの温度(70K)付近までの範
囲での給電を行い、高温超電導電流リード6が第1段冷
却ステージ7Aの部分から第2段冷却ステージ7Bの温
度範囲での給電を行う。Therefore, the normal-current conductive flow lead wire 16 supplies power in the range from the room temperature (300K) portion of the vacuum container 3 to the temperature (70K) of the first stage cooling stage 7A of the regenerator 7 and reaches a high temperature. The superconducting current lead 6 supplies electric power in the temperature range of the first cooling stage 7A to the second cooling stage 7B.
【0023】高温超電導電流リード6の高温側電極17
は、常電導電流リードワイヤ16に接続されるととも
に、熱アンカー銅線18、及び高温側窒化アルミニウム
板等による高温側絶縁材19を介して蓄冷式冷凍機7の
第1段冷却ステージ7Aに接続されている。High temperature side electrode 17 of high temperature superconducting current lead 6
Is connected to the normal-current conductive flow lead wire 16 and is also connected to the first-stage cooling stage 7A of the regenerator 7 via the heat anchor copper wire 18 and the high temperature side insulating material 19 such as the high temperature side aluminum nitride plate. Has been done.
【0024】高温超電導電流リード6の低温側電極20
は、低温側窒化アルミニウム板等による低温側絶縁材2
1を介して蓄冷式冷凍機7の第2冷却ステージ7Bにボ
ルトによって接続固定され固定端としてあるとともに、
超電導コイル5の超電導線材10に接続してある。Low temperature side electrode 20 of high temperature superconducting current lead 6
Is a low temperature side insulating material 2 such as a low temperature side aluminum nitride plate
1 is connected to and fixed to the second cooling stage 7B of the regenerator 7 via bolts 1 as a fixed end,
It is connected to the superconducting wire 10 of the superconducting coil 5.
【0025】酸化物高温超電導体から成る高温超電導電
流リード6は、強磁界中に設置された場合には、通電能
力(電流密度)が劣化する特性があるので、リード本体
への磁場を低減させる機能が要求される。The high-temperature superconducting current lead 6 made of an oxide high-temperature superconductor has a characteristic that its current-carrying capability (current density) deteriorates when it is installed in a strong magnetic field, so that the magnetic field to the lead body is reduced. Function is required.
【0026】この為に、高温超電導電流リード6の周り
に、円筒状の超電導磁気シールド51が設けられてい
る。For this reason, a cylindrical superconducting magnetic shield 51 is provided around the high-temperature superconducting current lead 6.
【0027】超電導磁気シールド51は、NbTi等の金属
系超電導材料から構成され、高温超電導電流リード6の
外側を環状に覆う構造としたもので、超電導コイル5か
ら高温超電導電流リード6にかかる磁場を低減させてい
る。The superconducting magnetic shield 51 is made of a metallic superconducting material such as NbTi and has a structure in which the outside of the high-temperature superconducting current lead 6 is annularly covered, and the magnetic field applied from the superconducting coil 5 to the high-temperature superconducting current lead 6 is applied. It is decreasing.
【0028】また、この超電導磁気シールド51は、蓄
冷式冷凍機7の第2段冷却ステージ7Bと直接接触によ
りこれを極低温(例えば、5K以下)に冷却可能とし、
超電導磁気シールド51を構成する超電導材の臨界温度
(例えば、NbTiの臨界温度は9.8K)以下に保つこと
ができる。Further, the superconducting magnetic shield 51 can directly cool the second stage cooling stage 7B of the regenerator 7 to cool it to an extremely low temperature (for example, 5K or less).
The superconducting material forming the superconducting magnetic shield 51 can be maintained at a critical temperature (for example, the critical temperature of NbTi is 9.8K) or lower.
【0029】具体的には、第2段冷却ステージ7Bに接
触している低温側絶縁材21にこの超電導磁気シールド
51を固定してある。Specifically, the superconducting magnetic shield 51 is fixed to the low temperature side insulating material 21 which is in contact with the second cooling stage 7B.
【0030】こうした構成の伝導冷却型超電導磁石装置
1において、外部電源8からの正極電流は、最初に電流
リード端子15を経て常電導電流リードワイヤ16に導
かれ、ついで順次、高温側電極17、高温超電導電流リ
ード6、低温側電極20に導かれ、超電導コイル5が励
磁される。In the conduction cooling type superconducting magnet device 1 having such a configuration, the positive electrode current from the external power source 8 is first introduced to the normal conducting current lead wire 16 via the current lead terminal 15, and then successively to the high temperature side electrode 17. The superconducting coil 5 is excited by being guided to the high temperature superconducting current lead 6 and the low temperature side electrode 20.
【0031】尚、負極電流は、上述と逆のコースで外部
電源8まで戻る。The negative electrode current returns to the external power source 8 in the course opposite to the above.
【0032】超電導コイル5と蓄冷式冷凍機7の第2段
冷却ステージ7Bとの間の熱接触は、コイル巻き枠9を
介して行われるが、この熱伝導に加えて、第2段冷却ス
テージ7Bに接触している外周冷却用銅ブロック11を
介しても熱伝導が行われる。The thermal contact between the superconducting coil 5 and the second stage cooling stage 7B of the regenerator 7 is performed via the coil winding frame 9. In addition to this heat conduction, the second stage cooling stage is also provided. Heat conduction is also performed through the outer peripheral cooling copper block 11 that is in contact with 7B.
【0033】従って、超電導コイル5の内面側からの熱
交換とともに、超電導コイル5の外表面全体からも熱交
換が行われるので、超電導コイル5の初期冷却が速やか
に行われ、かつ超電導コイル5内部が温度均一に冷却さ
れる。Therefore, heat is exchanged not only from the inner surface side of the superconducting coil 5 but also from the entire outer surface of the superconducting coil 5, so that the initial cooling of the superconducting coil 5 can be performed quickly and the inside of the superconducting coil 5 can be quickly cooled. Is cooled to a uniform temperature.
【0034】また、極低温に冷却された超電導磁気シー
ルド51が、高温超電導電流リード6に対する磁気を有
効にシールドする。Further, the superconducting magnetic shield 51 cooled to an extremely low temperature effectively shields the magnetism with respect to the high temperature superconducting current lead 6.
【0035】[0035]
【発明の効果】本発明の伝導冷却型超電導磁石装置は、
電流リードの磁気シールドを低温とした超電導電流リー
ドによって有効に行うことができ、この結果、高いシー
ルド特性を得ることができ、電流リードにおける臨界電
流の低下を防止することができる。The conduction cooling type superconducting magnet device of the present invention comprises:
The magnetic shield of the current lead can be effectively performed by the superconducting current lead at a low temperature, and as a result, high shield characteristics can be obtained and the reduction of the critical current in the current lead can be prevented.
【図1】本発明の一実施例による伝導冷却型超電導磁石
装置の一部縦断面図である。FIG. 1 is a partial vertical cross-sectional view of a conduction cooling type superconducting magnet device according to an embodiment of the present invention.
【図2】図1に示す伝導冷却型超電導磁石装置の外周冷
却用銅ブロックの具体的構成を示す一部切欠縦断面図で
ある。FIG. 2 is a partially cutaway vertical sectional view showing a specific configuration of a copper block for cooling the outer circumference of the conduction cooling type superconducting magnet device shown in FIG.
【図3】図2のIII −III 線断面図である。3 is a sectional view taken along line III-III in FIG.
1 伝導冷却型超電導電磁石装置 2 基台 3 真空容器 4 熱シールド板 5 超電導コイル 6 高温超電導電流リード 7 蓄冷式冷凍機 7A 第1段冷却ステージ 7B 第2段冷却ステージ 8 外部電源 9 コイル巻き枠 9A 巻き芯 9B 端部フランジ 10 超電導線材 11 外周冷却用銅ブロック 51 超電導磁気シールド 1 conduction cooling type superconducting electromagnet device 2 base 3 vacuum container 4 heat shield plate 5 superconducting coil 6 high temperature superconducting current lead 7 regenerator 7A first cooling stage 7B second cooling stage 8 external power supply 9 coil reel 9A Winding core 9B End flange 10 Superconducting wire 11 Peripheral cooling copper block 51 Superconducting magnetic shield
Claims (2)
た超電導コイルと、該超電導コイルに給電する電流リー
ドとを含み、該電流リードが酸化物高温超電導体により
構成されている伝導冷却型超電導磁石装置において、前
記冷凍機の冷却ステージに前記超電導コイルを接触させ
るとともに、前記電流リードの外周に超電導磁気シール
ドを設け、該超電導磁気シールドは、金属系超電導材料
から構成され、且つ前記冷却ステージに接触させてある
ことを特徴とする伝導冷却型超電導磁石装置。1. A conduction cooling type including a refrigerator, a superconducting coil that can be cooled by the refrigerator, and a current lead for supplying power to the superconducting coil, the current lead being composed of an oxide high-temperature superconductor. In the superconducting magnet device, the superconducting coil is brought into contact with the cooling stage of the refrigerator, and a superconducting magnetic shield is provided on the outer circumference of the current lead, and the superconducting magnetic shield is made of a metal-based superconducting material, and the cooling stage is provided. A conduction cooling type superconducting magnet device characterized in that it is in contact with
段冷却ステージ、及び該第1段冷却ステージより低温の
第2段冷却ステージを設け、該第2段冷却ステージに前
記超電導コイル及び前記超電導磁気シールドを接触させ
たことを特徴とする請求項1記載の伝導冷却型超電導磁
石装置。2. A first cooling stage for the refrigerator
The step cooling stage and a second step cooling stage having a temperature lower than that of the first step cooling stage are provided, and the superconducting coil and the superconducting magnetic shield are brought into contact with the second step cooling stage. Conduction cooling type superconducting magnet device.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5225637A JPH0786642A (en) | 1993-09-10 | 1993-09-10 | Conduction cooling superconduction magnet device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5225637A JPH0786642A (en) | 1993-09-10 | 1993-09-10 | Conduction cooling superconduction magnet device |
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Publication Number | Publication Date |
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JPH0786642A true JPH0786642A (en) | 1995-03-31 |
Family
ID=16832429
Family Applications (1)
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JP5225637A Pending JPH0786642A (en) | 1993-09-10 | 1993-09-10 | Conduction cooling superconduction magnet device |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0911839A1 (en) * | 1997-10-24 | 1999-04-28 | Sumitomo Electric Industries, Ltd. | Operation control method for superconducting coil |
JP2009026804A (en) * | 2007-07-17 | 2009-02-05 | Railway Technical Res Inst | Heat generation preventing device for metallic heat exchanger of superconducting equipment |
JP2015028912A (en) * | 2013-07-05 | 2015-02-12 | 中部電力株式会社 | Superconductive wire rod and superconductive coil using the same |
-
1993
- 1993-09-10 JP JP5225637A patent/JPH0786642A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0911839A1 (en) * | 1997-10-24 | 1999-04-28 | Sumitomo Electric Industries, Ltd. | Operation control method for superconducting coil |
JP2009026804A (en) * | 2007-07-17 | 2009-02-05 | Railway Technical Res Inst | Heat generation preventing device for metallic heat exchanger of superconducting equipment |
JP2015028912A (en) * | 2013-07-05 | 2015-02-12 | 中部電力株式会社 | Superconductive wire rod and superconductive coil using the same |
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