JPS6367706A - Cryostat - Google Patents
CryostatInfo
- Publication number
- JPS6367706A JPS6367706A JP61210845A JP21084586A JPS6367706A JP S6367706 A JPS6367706 A JP S6367706A JP 61210845 A JP61210845 A JP 61210845A JP 21084586 A JP21084586 A JP 21084586A JP S6367706 A JPS6367706 A JP S6367706A
- Authority
- JP
- Japan
- Prior art keywords
- liquid nitrogen
- stainless steel
- magnetic field
- heat shield
- plate
- 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.)
- Pending
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 19
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 15
- 239000010935 stainless steel Substances 0.000 claims abstract description 15
- 239000001307 helium Substances 0.000 claims description 5
- 229910052734 helium Inorganic materials 0.000 claims description 5
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 5
- 230000000694 effects Effects 0.000 abstract description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052802 copper Inorganic materials 0.000 abstract description 6
- 239000010949 copper Substances 0.000 abstract description 6
- 238000001816 cooling Methods 0.000 abstract description 4
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 241000220317 Rosa Species 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Landscapes
- Containers, Films, And Cooling For Superconductive Devices (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、超電導マグネットに使用されるクライオス
タットに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cryostat used in a superconducting magnet.
第二図は従来のクライオスタットを示し、中空環状の真
空槽（１）は、真空槽フランジ（ｔＩ）、真空槽内筒（
ヨ）からなり、その中に液体窒素槽（２）、熱シールド
磁場コイル（７）が配置されている。Figure 2 shows a conventional cryostat, with a hollow annular vacuum chamber (1) consisting of a vacuum chamber flange (tI), a vacuum chamber inner cylinder (
y), in which a liquid nitrogen tank (2) and a heat shield magnetic field coil (7) are arranged.
従来のクライオスタットでは、液体ヘリウムの消費量を
少なくするため、液体ヘリウム槽（ｆｆ）と真空槽内筒
（ｊ）の間に、液体窒素槽（２）からの熱伝導によって
冷却される熱シールド板（３）を設けていた。In conventional cryostats, in order to reduce the amount of liquid helium consumed, a heat shield plate is installed between the liquid helium tank (ff) and the vacuum tank inner cylinder (j), which is cooled by heat conduction from the liquid nitrogen tank (2). (3) was provided.
熱シールド板（，７）の材質は熱伝導率が比較的高い銅
が使用されていた。The heat shield plate (, 7) was made of copper, which has relatively high thermal conductivity.
以上のような従来のクライオスタットでは、熱シールド
板（３）に銅を用いているため、傾斜磁場コイル（７）
運転時には、熱シールド板（３）に誘起される渦電流が
大きく、イメージングの際には、渦電流による磁場を補
正するため、傾斜磁場コイル（り）の出力はその分だけ
余計に必要であった。また、渦電流損失により熱シール
ド板（、？）の温度が上がり、充分な熱シールド効果が
得られないなどの問題点があった。In the conventional cryostat described above, copper is used for the heat shield plate (3), so the gradient magnetic field coil (7)
During operation, the eddy current induced in the heat shield plate (3) is large, and during imaging, the output of the gradient magnetic field coil (RI) is required to compensate for the magnetic field caused by the eddy current. Ta. In addition, there was a problem that the temperature of the heat shield plate (?) rose due to eddy current loss, making it impossible to obtain a sufficient heat shield effect.
この発明は上記のような問題点を解消するため罠なされ
たもので、傾斜磁場コイルに必要な出力をできるだけ少
なくするとともに、充分な熱シールド効果を有するクラ
イオスタットを得ることを目的とする。This invention was made to solve the above-mentioned problems, and aims to reduce the output required for the gradient magnetic field coil as much as possible, and to obtain a cryostat having a sufficient heat shielding effect.
この発明に係るクライオスタットは、熱シールド板にス
テンレス材を用い、そのまわりに液体窒素の流れるパイ
プが取付けられている。The cryostat according to the present invention uses a stainless steel material for the heat shield plate, and a pipe through which liquid nitrogen flows is attached around the heat shield plate.
この発明九おいては、ステンレスの熱シールドは、シー
ルド内での渦電流を小さくし、そのまわりの液体窒素が
流れるパイプは、ステンレス熱シールドの冷却効果を高
める。In this invention, the stainless steel heat shield reduces eddy currents within the shield, and the pipe around which liquid nitrogen flows increases the cooling effect of the stainless steel heat shield.
第１図はこの発明の一実施例を示し、熱シールド板（Ｊ
ａ）はステンレスでなり、その壕わりに液体窒素槽（２
）より導びかれた液体窒素が流れるパイプ（９）が配設
されている。FIG. 1 shows an embodiment of the present invention, in which a heat shield plate (J
a) is made of stainless steel, and a liquid nitrogen tank (2
) is provided with a pipe (9) through which liquid nitrogen is introduced.
その他、第二図におけると同一符号は同一部分を示して
いる。In addition, the same reference numerals as in FIG. 2 indicate the same parts.
以上の構成により、傾斜玉揚コイル（７）が運転されて
いるときには、ステンレスの熱シールド板（３ａ）に渦
電流が誘起されるが、ステンレスの場合、銅に比べて電
気抵抗が約１０００倍であり、その分、渦電流による磁
場出力（ま減る。したがって、その磁場出力を補正する
分だけ傾斜磁場コイル（７）の出力を減らすことができ
る。With the above configuration, when the inclined doffing coil (7) is in operation, an eddy current is induced in the stainless steel heat shield plate (3a), but in the case of stainless steel, the electrical resistance is about 1000 times that of copper. Therefore, the output of the gradient magnetic field coil (7) can be reduced by the amount by which the magnetic field output is corrected.
ステンレスは銅に比べて熱伝導率が約／ ／ １０ ｏ
θであり、液体窒素槽（コ）からの熱伝導による冷却で
は充分な熱シールド効果が得られないが、ステンレスの
熱シールド板（３）の表面に沿って、パイプ（ｑ）を取
付け、内部に液体窒素槽（＝）から供給される液体窒素
を流すことによって、熱シールド板（３ａ）を冷却し、
熱シールド効果を高めることができる。Stainless steel has a thermal conductivity of about / / 10 o compared to copper.
θ, and cooling by heat conduction from the liquid nitrogen tank (q) cannot provide a sufficient heat shielding effect, but a pipe (q) is installed along the surface of the stainless steel heat shield plate (3), and the internal Cool the heat shield plate (3a) by flowing liquid nitrogen supplied from the liquid nitrogen tank (=) to
It can enhance the heat shielding effect.
なお、上記の実施例では、ステンレスの熱シールド板（
Ｊａ）にパイプを取付けたが、熱シールド板の替わりに
、第コの液体窒素槽を設けてもよい。In addition, in the above example, a stainless steel heat shield plate (
Although the pipe was attached to the heat shield plate, a liquid nitrogen tank may be provided instead of the heat shield plate.
また、上記の実施例では、核磁気共鳴用の超電導マクネ
ットに使用されるクライオスタットについて説明したが
、他の渦電流対策を要するクライオスタットに適用する
ことができ、上記実施例と同様の効果を奏する。Further, in the above embodiment, a cryostat used in a superconducting maknet for nuclear magnetic resonance was explained, but it can be applied to a cryostat that requires other eddy current countermeasures, and the same effects as in the above embodiment can be achieved. .
以上のように、この発明によれば、ステンレス製の熱シ
ールド板を用い、これに液体窒素のパイ傾斜磁場コイル
用の電源が従来より、小形になり、また、安価になると
いう効果がある。As described above, according to the present invention, a stainless steel heat shield plate is used, and a power source for a liquid nitrogen pi gradient magnetic field coil is smaller and cheaper than the conventional one.
第１図はこの発明の一実施例の一部断面図であり、第２
図は従来のクライオスタットの一部断面図である。
（１）・・真空槽、−）・・液体窒素槽、（３ａ）・・
熱シールド板、（μ）・・真空槽フランジ、（ｓ）・・
真空槽内筒、（６）・・ボア、（７）・・傾斜侮場コイ
ル、（ｆｌ・・液体ヘリウム槍、（９）・拳液体窒素が
流れるパイプ。
なお、各図中５同一符号は同−又は和尚部分を÷モ１１
−
帛Ｉ図FIG. 1 is a partial sectional view of one embodiment of the present invention, and FIG.
The figure is a partial cross-sectional view of a conventional cryostat. (1)...Vacuum tank, -)...Liquid nitrogen tank, (3a)...
Heat shield plate, (μ)...Vacuum chamber flange, (s)...
Vacuum tank inner tube, (6)...bore, (7)...inclined field coil, (fl...liquid helium spear, (9) fist, pipe through which liquid nitrogen flows. Note that 5 in each figure has the same symbol. The same - or the monk part ÷ 11
− Map I
Claims (1)
いて、真空槽内に収納された液体ヘリウム槽および液体
窒素槽と、前記真空槽の内筒と前記液体ヘリウム槽との
間に配設されたステンレス材でなる熱シールド板と、こ
の熱シールド板のまわりに配設され前記液体窒素槽から
の液体窒素が流れるパイプとを備えてなることを特徴と
するクライオスタット。In a cryostat used in a superconducting magnet, a liquid helium tank and a liquid nitrogen tank are housed in a vacuum chamber, and a heat shield made of stainless steel is provided between the inner cylinder of the vacuum chamber and the liquid helium tank. A cryostat comprising: a plate; and a pipe disposed around the heat shield plate through which liquid nitrogen from the liquid nitrogen tank flows.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61210845A JPS6367706A (en) | 1986-09-09 | 1986-09-09 | Cryostat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61210845A JPS6367706A (en) | 1986-09-09 | 1986-09-09 | Cryostat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6367706A true JPS6367706A (en) | 1988-03-26 |
Family
ID=16596064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61210845A Pending JPS6367706A (en) | 1986-09-09 | 1986-09-09 | Cryostat |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6367706A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3924579A1 (en) * | 1988-07-27 | 1990-02-01 | Mitsubishi Electric Corp | SUPRALINE MAGNETIC ARRANGEMENT |
| JPH0428210A (en) * | 1990-05-23 | 1992-01-30 | Mitsubishi Electric Corp | Cryogenic temperature device for superconducting coil |
-
1986
- 1986-09-09 JP JP61210845A patent/JPS6367706A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3924579A1 (en) * | 1988-07-27 | 1990-02-01 | Mitsubishi Electric Corp | SUPRALINE MAGNETIC ARRANGEMENT |
| JPH0428210A (en) * | 1990-05-23 | 1992-01-30 | Mitsubishi Electric Corp | Cryogenic temperature device for superconducting coil |
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