JP3035220B2 - Superconducting coil heat shield plate - Google Patents
Superconducting coil heat shield plateInfo
- Publication number
- JP3035220B2 JP3035220B2 JP18807696A JP18807696A JP3035220B2 JP 3035220 B2 JP3035220 B2 JP 3035220B2 JP 18807696 A JP18807696 A JP 18807696A JP 18807696 A JP18807696 A JP 18807696A JP 3035220 B2 JP3035220 B2 JP 3035220B2
- Authority
- JP
- Japan
- Prior art keywords
- heat shield
- shield plate
- superconducting coil
- superconducting
- refrigerator
- 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.)
- Expired - Fee Related
Links
Landscapes
- Containers, Films, And Cooling For Superconductive Devices (AREA)
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は冷凍機伝導冷却型超電導
マグネット装置に関し、特に該マグネット装置の超電導
コイルを冷却する際に使用する熱シールド板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conduction cooling type superconducting magnet device for a refrigerator, and more particularly to a heat shield plate used for cooling a superconducting coil of the magnet device.
【０００２】[0002]
【従来の技術】図４は従来の冷凍機伝導冷却型超電導マ
グネット装置１の概略を示す一部縦断面図であって、真
空容器（クライオスタット）２の天板３に蓄冷式２段冷
凍機４を設置し、該冷凍機４の第２冷却シリンダ５ｂ先
端部の第２段冷却ステージ６ｂには超電導コイル７が取
付けられており、冷凍機４の第１段冷却シリンダ５ａ先
端部の第１段冷却ステージ６ａに取付けられている蔽蓋
９にコップ状の熱シールド板８のフランジ部１０を取付
け、前記超電導コイル７及び第２冷却シリンダ５ｂを熱
シールド板８で包被することにより超電導コイルの冷却
効率向上を図っている。2. Description of the Related Art FIG. 4 is a partial longitudinal sectional view schematically showing a conventional refrigerator superconducting conduction type superconducting magnet apparatus 1, in which a regenerative two-stage refrigerator 4 is mounted on a top plate 3 of a vacuum vessel (cryostat) 2. A superconducting coil 7 is attached to the second cooling stage 6b at the tip of the second cooling cylinder 5b of the refrigerator 4, and the first stage at the tip of the first cooling cylinder 5a of the refrigerator 4 The flange portion 10 of the cup-shaped heat shield plate 8 is attached to the shielding lid 9 attached to the cooling stage 6a, and the superconducting coil 7 and the second cooling cylinder 5b are covered with the heat shield plate 8 to thereby form the superconducting coil. The cooling efficiency is improved.
【０００３】前記マグネット装置の通常の使用状態では
継続的に超電導コイルに電流を流している。しかし、何
らかの原因によりクェンチ（超電導状態が破れること）
したとき磁場が急激に変化し、熱シールド板に渦電流が
生じ、超電導コイル側からの残留磁場によって、熱シー
ルド板内に電磁力が発生する。磁場強度が５テスラ程度
の弱い磁場の場合は特に問題が起こらないが、１０テラ
ス以上の強磁場の場合には、５テラス時の電磁力を単純
に２倍にした以上の力が生じる。それゆえ、熱シールド
板は通常アルミニウムの薄板製であるため、内側へ変形
し超電導コイル及び熱シールド板を損傷する事故を起し
ていた。In a normal use state of the magnet device, a current is continuously applied to the superconducting coil. However, for some reason, quench (breaking of the superconducting state)
Then, the magnetic field changes abruptly, an eddy current is generated in the heat shield plate, and an electromagnetic force is generated in the heat shield plate by the residual magnetic field from the superconducting coil side. In the case of a weak magnetic field with a magnetic field strength of about 5 Tesla, no particular problem occurs, but in the case of a strong magnetic field of 10 terraces or more, a force more than simply doubling the electromagnetic force at the time of 5 terraces is generated. Therefore, since the heat shield plate is usually made of a thin aluminum plate, the heat shield plate is deformed inward, causing an accident to damage the superconducting coil and the heat shield plate.
【０００４】この熱シールド板を厚い部材で構成した
り、頑強な構造にすることも考えられるが、そうする
と、熱シールド板の冷却の負荷が増大し、冷却効率を向
上させるという本来の目的を達することができない。ま
た、超電導コイルに吸着されて内側へ変形しないよう
に、超電導コイルと熱シールド板との間に補強材を設け
たり、あるいは真空容器と熱シールド板との間に補強材
を設けたりすると、これらの接続箇所からの熱伝導によ
る熱侵入を助長することとなり冷却効率を悪化させると
いう問題点がある。[0004] It is conceivable that the heat shield plate is made of a thick member or has a robust structure. However, in this case, the load of cooling the heat shield plate increases, and the original purpose of improving the cooling efficiency is achieved. Can not do. Also, if a reinforcing material is provided between the superconducting coil and the heat shield plate, or a reinforcing material is provided between the vacuum vessel and the heat shield plate, so that the superconducting coil is not attracted and deformed inward, There is a problem that heat intrusion due to heat conduction from the connection point is promoted and cooling efficiency is deteriorated.
【０００５】[0005]
【発明が解決しようとする課題】超電導コイルのクェン
チ時、熱シールド板８に渦電流が発生するのを抑制また
は低減させ、局部的に渦電流が発生しても熱シールド板
の損傷を防止することを目的とする。When a superconducting coil is quenched, generation of an eddy current in the heat shield plate 8 is suppressed or reduced, and damage to the heat shield plate even when a local eddy current is generated is prevented. The purpose is to:
【０００６】[0006]
【課題を解決するための手段】冷凍機伝導冷却型超電導
マグネット装置の超電導コイルを包被する有底円筒状の
熱シールド板において、該熱シールド板の胴部および底
部に切り欠きを設け、かつ、前記超電導コイルの端部と
前記熱シールド板の底部間に複数個の円錐体または角錐
体のスペーサーを該スペーサーの頂部が前記熱シールド
板の底部と当接するように設けたことを特徴とする。ま
たこれらのスペーサーはＦＲＰ製であることを特徴とす
る。Means for Solving the Problems In a bottomed cylindrical heat shield plate for covering a superconducting coil of a refrigerator conduction cooling type superconducting magnet device, notches are provided in a body portion and a bottom portion of the heat shield plate, and A plurality of conical or pyramid spacers are provided between the end of the superconducting coil and the bottom of the heat shield plate such that the top of the spacer abuts the bottom of the heat shield plate. . These spacers are made of FRP.
【０００７】[0007]
【発明の実施の形態】図１は本発明にかかる熱シールド
板の実施例を示す。熱シールド板８そのものの構造は従
来からのものと同様に無酸素銅、アルミニウム等の薄板
で超電導コイル７および冷凍機の第２冷却シリンダ５ｂ
を包被できるようにコップ状に形成されており、胴部８
ａ、底部８ｂ、胴部上端縁のフランジ１０からなってい
る。しかして本発明は、かかる熱シールド板の胴部８ａ
の長手方向全長にわたりスリット１１ａを刻設するとと
もに、底部８ｂにも前記スリット１１ａに連続して中心
方向に向けてスリット１１ｂを刻設している。FIG. 1 shows an embodiment of a heat shield plate according to the present invention. The structure of the heat shield plate 8 itself is a thin plate made of oxygen-free copper, aluminum or the like as in the conventional case, and is made of a superconducting coil 7 and a second cooling cylinder 5b of a refrigerator.
Is formed in a cup shape so as to cover the
a, bottom 8b, and flange 10 at the upper edge of the trunk. Thus, the present invention relates to such a heat shield plate body 8a.
The slit 11a is engraved over the entire length in the longitudinal direction, and the slit 11b is also engraved on the bottom portion 8b in the direction of the center following the slit 11a.
【０００８】超伝導コイル７の端部７ａと熱シールド板
底部８ｂとの間の空隙には複数個の円推体ないしは角錐
体のスペーサー１２が設置されている。スペーサー１２
の材料としては機械的強度が高く、熱伝導度の低い材料
が好ましい。本発明ではＦＲＰを採用している。A plurality of circular or pyramid spacers 12 are provided in the gap between the end 7a of the superconducting coil 7 and the bottom 8b of the heat shield plate. Spacer 12
As a material of the above, a material having high mechanical strength and low thermal conductivity is preferable. In the present invention, FRP is adopted.
【０００９】図２は本発明の熱シールド板を冷凍機伝導
冷却型超電導マグネット装置にセットした態様を示して
いる。超電導マグネツト装置の運転中超電導コイルにク
ェンチ現象が起きても、熱シールド板に刻設したスリッ
ト１１ａ、１１ｂにより熱シールド板８に渦電流が発生
するのを防止ないしは低減させることができる。また、
たとえ局部的に渦電流が発生しても、スペーサー１２に
より熱シールド板８の変形を防止できる。FIG. 2 shows an embodiment in which the heat shield plate of the present invention is set in a conduction cooling type superconducting magnet device of a refrigerator. Even if a quench phenomenon occurs in the superconducting coil during operation of the superconducting magnet device, the generation of eddy currents in the heat shield plate 8 can be prevented or reduced by the slits 11a and 11b formed in the heat shield plate. Also,
Even if an eddy current is generated locally, the deformation of the heat shield plate 8 can be prevented by the spacer 12.
【００１０】図３は本発明の熱シールド板を中央に円筒
状高磁場空間１３を有する冷凍機伝導冷却型超電導マグ
ネット装置１にセットした態様を示している。この実施
例においては熱シールド板８は環状空間を有する有底円
筒体に形成されている。なお、図中符号１４はコールド
プレート、１５ａ、１５ｂは支柱である。FIG. 3 shows an embodiment in which the heat shield plate of the present invention is set in a refrigerator conduction cooling type superconducting magnet apparatus 1 having a cylindrical high magnetic field space 13 at the center. In this embodiment, the heat shield plate 8 is formed in a bottomed cylindrical body having an annular space. In the drawings, reference numeral 14 denotes a cold plate, and 15a and 15b denote struts.
【００１１】熱シールド板に刻設するスリットは図示で
は胴部８ａのスリット１１ａと底部８ｂのスリット１１
ｂは連続して形成されているが、胴部８ａのスリット１
１ａと底部８ｂのスリット１１ｂとは連続することな
く、胴部および底部に個別に形成するようにしてもよ
い。The slits formed in the heat shield plate are shown as slits 11a in the body 8a and slits 11 in the bottom 8b.
b is formed continuously, but the slit 1 of the trunk 8a is formed.
1a and the slit 11b of the bottom 8b may be formed separately on the trunk and the bottom without being continuous.
【００１２】[0012]
【発明の効果】本発明では、熱シールド板にスリットを
刻設したことにより、超電導コイルのクェンチ時、熱シ
ールド板に渦電流が発生するのを防止ないしは低減で
き、更にスペーサーを設置したことにより熱シールド板
の損傷を防止することができる。According to the present invention, by forming a slit in the heat shield plate, it is possible to prevent or reduce the generation of eddy current in the heat shield plate at the time of quenching of the superconducting coil. Damage to the heat shield plate can be prevented.
【００１３】なお、本発明は超電導コイルを熱シールド
板で包被している超電導マグネット装置全般に適用可能
であることはいうまでもない。It is needless to say that the present invention is applicable to all superconducting magnet devices in which a superconducting coil is covered with a heat shield plate.
【図１】本発明にかかる熱シールド板と超電導コイルと
の関係を示す斜視図。FIG. 1 is a perspective view showing a relationship between a heat shield plate and a superconducting coil according to the present invention.
【図２】本発明を冷凍機冷却型超電導マグネツト装置に
実施したときの概略を示す縦断面図。FIG. 2 is a longitudinal sectional view schematically showing the present invention applied to a refrigerator-cooled superconducting magnet device.
【図３】本発明を冷凍機冷却型超電導マグネット装置の
他の型式に実施したときの概略を示す縦断面図。FIG. 3 is a longitudinal sectional view schematically showing a case where the present invention is applied to another type of a refrigerator-cooled superconducting magnet device.
【図４】従来から公知の冷凍機冷却型超電導マグネット
装置の概略を示す縦断面図。FIG. 4 is a longitudinal sectional view schematically showing a conventionally known refrigerator-cooled superconducting magnet device.
１ 冷凍機冷却型超電導マグネット装置 ２ 真空容器（クライオスタット） ３ 天板 ４ 蓄冷式冷凍機 ５ａ 第１冷却シリンダ ５ｂ 第２冷却シリ
ンダ ６ａ 第１段冷却ステージ ６ｂ 第２段冷却ス
テージ ７ 超電導コイル ８ 熱シールド板 ８ａ 熱シールド板胴部 ８ｂ 熱シールド板
底部 ９ 蔽蓋 １０ フランジ １１ａ、１１ｂ スリット １２ スペーサ １４ コールドプレート １５ａ、１５ｂ
支柱DESCRIPTION OF SYMBOLS 1 Refrigerator cooling type superconducting magnet device 2 Vacuum container (cryostat) 3 Top plate 4 Cold storage refrigerator 5a 1st cooling cylinder 5b 2nd cooling cylinder 6a 1st stage cooling stage 6b 2nd stage cooling stage 7 Superconducting coil 8 Heat shield Plate 8a Heat shield plate body 8b Heat shield plate bottom 9 Cover 10 Flange 11a, 11b Slit 12 Spacer 14 Cold plate 15a, 15b
Prop
Claims (2)
（１）の超電導コイル（７）を包被する有底円筒状の熱
シールド板（８）において、該熱シールド板（８）の胴
部（８ａ）および底部（８ｂ）にスリット（１１ａ）、
（１１ｂ）を設け、かつ、前記超電導コイル（７）の端
部（７ａ）と前記熱シールド板の底部（８ｂ）間に複数
個の円錐体または角錐体のスペーサー（１２）を該スペ
ーサー（１２）の頂部が前記熱シールド板の底部（８
ｂ）と当接するように設けたことを特徴とする超電導コ
イルの熱シールド板。1. A bottomed cylindrical heat shield plate (8) for covering a superconducting coil (7) of a refrigerator conduction cooling type superconducting magnet device (1), wherein a trunk portion (8) of the heat shield plate (8) is provided. 8a) and a slit (11a) in the bottom (8b),
(11b) to provided, and the superconducting coil (7) end (7a) and the heat bottom of the shield plate (8b) said space a spacer of a plurality of cone or pyramid (12) between the
The top of the heat shield (12) is at the bottom (8) of the heat shield plate.
b) a heat shield plate for a superconducting coil, which is provided so as to be in contact with b) .
を特徴とする請求項１記載の超電導コイルの熱シールド
板。2. The heat shield plate for a superconducting coil according to claim 1, wherein the spacer is made of FRP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18807696A JP3035220B2 (en) | 1996-07-01 | 1996-07-01 | Superconducting coil heat shield plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18807696A JP3035220B2 (en) | 1996-07-01 | 1996-07-01 | Superconducting coil heat shield plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1022118A JPH1022118A (en) | 1998-01-23 |
| JP3035220B2 true JP3035220B2 (en) | 2000-04-24 |
Family
ID=16217291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18807696A Expired - Fee Related JP3035220B2 (en) | 1996-07-01 | 1996-07-01 | Superconducting coil heat shield plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3035220B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005117036A1 (en) * | 2004-05-25 | 2005-12-08 | Siemens Magnet Technology Ltd | Electrically conductive shield for refrigerator |
| GB0411603D0 (en) | 2004-05-25 | 2004-06-30 | Oxford Magnet Tech | Electromagnetic shield for refrigerator |
-
1996
- 1996-07-01 JP JP18807696A patent/JP3035220B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1022118A (en) | 1998-01-23 |
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