JP6400262B1 - 極低温冷凍機および磁気シールド - Google Patents
極低温冷凍機および磁気シールド Download PDFInfo
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- 238000001816 cooling Methods 0.000 claims abstract description 95
- 239000004020 conductor Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 124
- 230000005415 magnetization Effects 0.000 claims description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 34
- 230000000694 effects Effects 0.000 description 18
- 239000001307 helium Substances 0.000 description 17
- 229910052734 helium Inorganic materials 0.000 description 17
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 17
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- 238000002595 magnetic resonance imaging Methods 0.000 description 3
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- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910001275 Niobium-titanium Inorganic materials 0.000 description 2
- 230000004323 axial length Effects 0.000 description 2
- 229910052797 bismuth Inorganic materials 0.000 description 2
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 2
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- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical compound [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
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- 229910001220 stainless steel Inorganic materials 0.000 description 2
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- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
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- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
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- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
- F25B9/145—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle pulse-tube cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
- F25D19/006—Thermal coupling structure or interface
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- G—PHYSICS
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- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/3804—Additional hardware for cooling or heating of the magnet assembly, for housing a cooled or heated part of the magnet assembly or for temperature control of the magnet assembly
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/3806—Open magnet assemblies for improved access to the sample, e.g. C-type or U-type magnets
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/42—Screening
- G01R33/421—Screening of main or gradient magnetic field
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F6/00—Superconducting magnets; Superconducting coils
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0075—Magnetic shielding materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/001—Gas cycle refrigeration machines with a linear configuration or a linear motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/003—Gas cycle refrigeration machines characterised by construction or composition of the regenerator
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- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/14—Compression machines, plants or systems characterised by the cycle used
- F25B2309/1406—Pulse-tube cycles with pulse tube in co-axial or concentric geometrical arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/14—Compression machines, plants or systems characterised by the cycle used
- F25B2309/1428—Control of a Stirling refrigeration machine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/11—Reducing heat transfers
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- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2500/00—Problems to be solved
- F25B2500/12—Sound
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/14—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/38—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field
- G01R33/381—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets
- G01R33/3815—Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field using electromagnets with superconducting coils, e.g. power supply therefor
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Abstract
Description
M2/Mmax・(σ・t)max≦(σ・t)2<(σ・t)max
を満たしてもよい。すなわち、第2シールド部分70bについての磁気シールドパラメータ(σ・t)2は、第1シールド部分70aについての磁気シールドパラメータ(σ・t)maxに係数M2/Mmax(M2<Mmaxであるから、M2/Mmax<1である)を乗じた値まで低減されてもよい。このようにすれば、磁気ノイズの遮蔽と第2シールド部分70bの軽量化とを両立することができる。
M2/Mmax・(σ・t)max=(σ・t)2
を満たしてもよい。このようにすれば、磁気ノイズの遮蔽性能を保持しつつ、第2シールド部分70bを最も軽くすることができる。
(σ・t)2=(σ・t)max
を満たしてもよい。このようにすれば、第2シールド部分70bの磁気ノイズの遮蔽性能を、第1シールド部分70aと同等に設計することができる。例えば、第1シールド部分70aと第2シールド部分70bを同じ材料で等しい肉厚で形成することができるので、磁気シールド70の製造が容易となる。
M2/Mmax・(σ・t)max≦(σ・t)2≦(σ・t)max
を満たしてもよい。
M3/Mmax・(σ・t)max≦(σ・t)3≦(σ・t)max
を満たしてもよい。ここで、外部磁場Beによって、第3磁性蓄冷材には、第1の大きさの磁化Mmaxより小さい第3の大きさの磁化M3が生じるものとする。
Claims (11)
- 冷却ステージと、
前記冷却ステージを末端に備えるシリンダと、
磁性蓄冷材を備え、前記シリンダ内を往復動可能に前記シリンダに収容されたディスプレーサと、
前記冷却ステージに設置され、前記シリンダの外側を前記シリンダに沿って延在する筒状磁気シールドと、を備え、
前記筒状磁気シールドは、常伝導体で形成され、10K以下の温度領域における電気伝導率と前記筒状磁気シールドの肉厚との積が60MS(メガジーメンス)以上1980MS以下であることを特徴とする極低温冷凍機。 - 前記筒状磁気シールドは、10K以下の温度領域における電気伝導率と前記筒状磁気シールドの肉厚との積が89MS以上であることを特徴とする請求項1に記載の極低温冷凍機。
- 前記筒状磁気シールドは、10K以下の温度領域における電気伝導率と前記筒状磁気シールドの肉厚との積が1000MS以下であることを特徴とする請求項1または2に記載の極低温冷凍機。
- 前記筒状磁気シールドは、前記ディスプレーサの往復動による前記磁性蓄冷材の移動範囲の全体にわたって延在することを特徴とする請求項1から3のいずれかに記載の極低温冷凍機。
- 前記筒状磁気シールドは、前記ディスプレーサが上死点に位置するときの前記磁性蓄冷材の上面から軸方向に上方にさらに延びており、
前記ディスプレーサが上死点に位置するときの前記磁性蓄冷材の上面からの前記筒状磁気シールドの軸方向余長をLSu、前記ディスプレーサが上死点に位置するときの前記磁性蓄冷材の上面から前記筒状磁気シールドへの径方向距離をGuと表すとき、前記筒状磁気シールドは、LSu≧Guを満たすことを特徴とする請求項4に記載の極低温冷凍機。 - 前記筒状磁気シールドは、純銅または純アルミニウムで形成されていることを特徴とする請求項1から5のいずれかに記載の極低温冷凍機。
- 前記筒状磁気シールドは、前記冷却ステージにろう付け接合されていることを特徴とする請求項1から6のいずれかに記載の極低温冷凍機。
- 前記筒状磁気シールドは、前記冷却ステージと一体形成されていることを特徴とする請求項1から6のいずれかに記載の極低温冷凍機。
- 一段冷却ステージ及び二段冷却ステージを備え、
前記筒状磁気シールドは、前記二段冷却ステージに直接設置され、前記筒状磁気シールドの内径が、前記一段冷却ステージの外径より小さいことを特徴とする請求項1から8のいずれかに記載の極低温冷凍機。 - 前記ディスプレーサは、互いに軸方向に異なる位置に配置された第1磁性蓄冷材および第2磁性蓄冷材を備え、
前記筒状磁気シールドは、前記第1磁性蓄冷材を囲む第1シールド部分と、前記第2磁性蓄冷材を囲む第2シールド部分とを備え、
外部磁場によって、前記第1磁性蓄冷材、前記第2磁性蓄冷材はそれぞれ磁化され、前記第1磁性蓄冷材の第1の磁化量Mmax、前記第2磁性蓄冷材の第2の磁化量M2が生じ、前記第1の磁化量Mmaxは、前記第2の磁化量M2より大きく、
前記第1シールド部分についての前記電気伝導率と前記肉厚との積を(σ・t)max、前記第2シールド部分についての前記電気伝導率と前記肉厚との積を(σ・t)2と表すとき、前記筒状磁気シールドは、
M2/Mmax・(σ・t)max≦(σ・t)2≦(σ・t)max
を満たすことを特徴とする請求項1から9のいずれかに記載の極低温冷凍機。 - 極低温冷凍機の冷却ステージに直接設置される筒状の磁気シールドであって、
常伝導体で形成され、10K以下の温度領域における電気伝導率と前記筒状の磁気シールドの肉厚との積が60MS(メガジーメンス)以上1980MS以下であることを特徴とする磁気シールド。
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JP2017068412 | 2017-03-30 | ||
PCT/JP2018/012578 WO2018181396A1 (ja) | 2017-03-30 | 2018-03-27 | 極低温冷凍機および磁気シールド |
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JP (1) | JP6400262B1 (ja) |
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US10753653B2 (en) * | 2018-04-06 | 2020-08-25 | Sumitomo (Shi) Cryogenic Of America, Inc. | Heat station for cooling a circulating cryogen |
JP7195824B2 (ja) * | 2018-09-07 | 2022-12-26 | 住友重機械工業株式会社 | 極低温冷凍機 |
CN112358965B (zh) * | 2020-11-09 | 2023-01-24 | 中国计量大学 | 一种磁珠法核酸提取设备 |
JP2022161154A (ja) * | 2021-04-08 | 2022-10-21 | 住友重機械工業株式会社 | 超伝導磁石装置およびサイクロトロン |
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