EP0144873A2 - Cooling system for indirectly cooled superconducting magnets - Google Patents

Cooling system for indirectly cooled superconducting magnets Download PDF

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Publication number
EP0144873A2
EP0144873A2 EP84114197A EP84114197A EP0144873A2 EP 0144873 A2 EP0144873 A2 EP 0144873A2 EP 84114197 A EP84114197 A EP 84114197A EP 84114197 A EP84114197 A EP 84114197A EP 0144873 A2 EP0144873 A2 EP 0144873A2
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EP
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Prior art keywords
helium
cooling
storage vessel
cooling system
winding
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EP84114197A
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German (de)
French (fr)
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EP0144873B1 (en
EP0144873A3 (en
Inventor
Cord-Henrich Dr. Dipl.-Phys. Dustmann
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BBC Brown Boveri AG Germany
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Brown Boveri und Cie AG Germany
BBC Brown Boveri AG Germany
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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
    • H01F6/04—Cooling
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S505/00—Superconductor technology: apparatus, material, process
    • Y10S505/825—Apparatus per se, device per se, or process of making or operating same
    • Y10S505/888—Refrigeration
    • Y10S505/892—Magnetic device cooling

Definitions

  • the invention relates to a cooling system for indirectly cooled superconducting magnets with cooling channels through which liquid helium flows and which are in close thermal contact with the superconducting winding.
  • Indirectly cooled magnets have cooling coils through which liquid helium is pressed. This is no problem when using supercritical helium. However, a pump is required to push the liquid helium through the cooling coils. If the cooling coils are connected to a refrigeration system, the pump can be part of the refrigeration system. However, if the helium is removed from a storage vessel, a separate helium pump is required.
  • the object of the invention is to provide adespstem for indirectly cooled superconducting magnets, allows weleches Eipe convection and the input S-mentioned disadvantages are avoided.
  • a winding body for the superconducting winding has a lower supply channel and an upper collecting channel parallel to the horizontal magnetic axis and parallel cooling channels that connect the supply channel and the collecting channel with each other, and that the supply channel with the outflow of a compared to the winding body, the helium vessel is arranged in a higher position.
  • Flow line is connected, and the collecting duct is connected via a return line to a connecting piece of the helium vessel.
  • the liquid helium can flow through the outflow of the helium vessel into the lower feed channel and from there rises in parallel through the cooling channels into the upper collecting channel.
  • the helium which in the meantime has been heated and can be in the vapor phase, is passed into the return line, which directs the helium above the helium level back into the helium storage vessel. No pump is required for the helium circulation, it is done by convection.
  • the winding body can advantageously be produced by roller seam welding and inflating the cooling channels, care being taken to ensure that the curvature of the inflated cooling channels faces away from the winding he follows. This enables inexpensive production with high quality.
  • the winding body can be made of austenitic steel or aluminum, the latter material increasing the quench security according to the "quench bare" principle.
  • An advantageous embodiment of the invention provides that the end of the cold head of a mini-refrigerator, which works according to the Gifford-McMahon principle, for example, protrudes into the helium storage vessel.
  • the temperature of the cold head end is 4.2 K or below.
  • the end of the cold head protrudes into the gas space of the helium storage vessel and recondenses the helium gas flowing back through the return.
  • the invention provides in an expedient embodiment that the helium storage vessel has a connecting flange for a helium lifter, which can be arranged above the outflow.
  • the helium lifter is pushed through the connecting flange until it partially protrudes into the supply line and is screwed in.
  • the other end of the helium lifter protrudes into a helium can. So much helium is passed from the helium can into the helium storage container and the winding former until these have cooled and are filled to a certain height.
  • the helium storage vessel also contains a closable opening through which the still warm, gaseous helium can escape.
  • FIG. 1 shows a cylindrical winding body 10, in whose cooling surface cooling channels are embedded.
  • a feed channel 11 runs axially in the lower area of the winding body 10 and a collecting channel 12 runs axially in the upper area of the winding body 10.
  • Such a winding body 10 can be produced by roller seam welding and subsequent inflation of the cooling channels.
  • the lower feed channel 11 is connected to the bottom outlet 15 of a helium storage vessel 16 via a feed line 14.
  • the liquid helium can be conducted from the helium storage vessel 16 into the cooling channels 13 through these lines.
  • the heated helium (in the liquid or gaseous phase) is collected via the upper collecting channel 12 and reaches the upper region of the helium storage vessel 16 via the return 17.
  • the helium level 18 in the storage vessel 16 lies below the return inlet.
  • the end 20 of the cold head 22 has a sufficiently low temperature to condense the gaseous helium back.
  • the helium storage vessel 16 has a connecting flange 23 through which a helium lifter 24 is inserted.
  • the connecting flange 23 lies above the bottom outlet 15. For a first filling of the system, the helium lifter 24 is pushed into the feed line 14 and screwed.
  • FIG. 2 shows the cross section of a magnetic winding 25 with a cooling and vacuum system.
  • the magnet winding 25 is arranged concentrically around an examination opening 26 and consists of superconducting wire.
  • the superconducting winding 25 is applied to a winding body 10 which is designed according to FIG. 1.
  • the supply duct 11, the collecting duct 12 and two cooling ducts 13 can be seen in FIG.
  • Magnet winding 25 and coil carrier 10 are shielded on all sides by cold shields 27, 28.
  • the entire system is housed in a vacuum container consisting of an inner jacket 29 and an outer jacket 30.

Abstract

Es wird ein Kühlsystem für indirekt gekühlte supraleitende Magnete mit von flüssigem Helium durchflossenen Kühlkanälen (13), die in engem thermischem Kontakt mit der supraleitenden Wicklung (25) stehen, angegeben, durch welches wine Konvektionskühlung ohne Verwendung von Heliumpumpen ermöglicht wird. Hierfür wird ein Wickelkörper (10) für die Wicklung (25) derart ausgebildet, daß er einen unteren Zuleitungskanal (11) und einen oberen Sammelkanal (12) sowie parallel geschaltete Kühlkanäle (13), die den Zuleitungskanal (11) und den Sammelkanal (12) miteinander verbinden, zuweist. Der Zuleitungskanal (11) ist mit dem Bodenausfluß (15) eines gegenüber dem Wickelkörper (10) erhöht angeordneten Heliumvorratsgefäßes (16) über eine Vorlaufleitung (14) verbunden. Der Sammelkanal (12) ist über einen Rücklauf (17) mit einem Anschlußstutzen (19) des Heliumvorratsgefäßes (16) verbunden. Der Kaltkopf (22) eines Minirefrigerators kondensiert das gasförmige Helium zurück, so daß sich ein laufendes Nachfüllen des Heliumvorratsgefäßes (16) erübrigt.A cooling system for indirectly cooled superconducting magnets with cooling channels (13) through which liquid helium flows and which are in close thermal contact with the superconducting winding (25) is specified, by means of which wine convection cooling is made possible without the use of helium pumps. For this purpose, a winding body (10) for the winding (25) is designed in such a way that it has a lower supply duct (11) and an upper collecting duct (12) as well as cooling ducts (13) connected in parallel, which separate the supply duct (11) and the collecting duct (12 ) connect, assign. The supply duct (11) is connected to the bottom outlet (15) of a helium storage vessel (16) which is arranged higher than the winding body (10) via a flow line (14). The collecting duct (12) is connected via a return line (17) to a connecting piece (19) of the helium storage vessel (16). The cold head (22) of a minirefrigerator condenses the gaseous helium back, so that there is no need to continuously refill the helium storage vessel (16).

Description

Die Erfindung betrifft ein Kühlsystem für indirekt gekühlte supraleitende Magnete mit von flüssigem Helium durchflossenen Kühlkanälen, die in engem thermischen Kontakt mit der supraleitenden Wicklung stehen.The invention relates to a cooling system for indirectly cooled superconducting magnets with cooling channels through which liquid helium flows and which are in close thermal contact with the superconducting winding.

Indirekt gekühlte Magnete haben Kühlschlangen, durch die flüssiges Helium hindurchgedrückt wird. Dies .ist bei Verwendung von überkritiechem Helium problemlos. Es ist jedoch eine Pumpe erforderlich, die das flüssige Helium durch die Kühlschlangen drückt. Sind die Kühlschlangen an eine Kälteanlagen angeschlossen, so kann die Pumpe Bestandteil der Kälteanlage sein. Wird jedoch das Helium einem Vorratsgefäß entnommen, so ist eine separate Heliumpumpe erforderlich.Indirectly cooled magnets have cooling coils through which liquid helium is pressed. This is no problem when using supercritical helium. However, a pump is required to push the liquid helium through the cooling coils. If the cooling coils are connected to a refrigeration system, the pump can be part of the refrigeration system. However, if the helium is removed from a storage vessel, a separate helium pump is required.

Soll die Verwendung einer Heliumpumpe vermieden werden und/oder soll mit zweiphasigem Helium gekühlt werden, so besteht die Gefahr von Instabilitäten durch den sogenannten Gartenschlaucheffekt, wenn die Kühlkanäle in vertikaliegenden Schlangen angeordnet sind, wie es bei Magneten mit horizontaler Magnetfeldachse häufig der Fall ist. Der Gartenschlaucheffekt macht eine Kühlung mit zweiphasigem Helium mit umlaufenden Kühlkanälen bei Verwendung eines Heliumvorratsgefäßes und Minirefrigerators, der keine Expansionsmaschine erfordert, unmög- lich.If the use of a helium pump is to be avoided and / or cooling is to be carried out with two-phase helium, there is a risk of instability due to the so-called garden hose effect if the cooling channels are arranged in vertical coils, as is the case with Magnets with a horizontal magnetic field axis are often the case. The garden hose effect makes cooling with two-phase helium with circumferential cooling channels impossible when using a helium storage vessel and mini-regenerator, which does not require an expansion machine.

Aufgabe der Erfindung ist es, ein Kühlspstem für indirekt gekühlte supraleitende Magnete anzugeben, weleches eipe Konvektionskühlung ermöglicht und die eingangs genannten Nachteile vermeidet.The object of the invention is to provide a Kühlspstem for indirectly cooled superconducting magnets, allows weleches Eipe convection and the input S-mentioned disadvantages are avoided.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß ein Wickelkörper für die supraleitende Wicklung einen unteren Zuleitungskanal und einen oberen Sammelkanal parallel zur horizontalen Magnetachse sowie parallel geschaltete Kühlkanäle, die den Zuleitungskanal und den Sammelkanal miteinander.verbinden, aufweist, und daß der Zuleitungskanal mit dem Ausfluß eines gegenüber dem Wickelkörper erhöht angeordneten Heliumgefäßes über eine . Vorlaufleitung verbunden ist, und der Sammelkanal über einen Rücklauf mit einem Anschlußstutzen.des Heliumgefäßes verbunden ist. Das flüssige Helium kann durch den Ausfluß des Heliumgefäßes in den unteren Zuleitungskanal fließen und steigt von hier parallel durch die Kühlkanäle in den oberen Sammelkanal. Vom Sammelkanal wird das Helium, das inzwischen erwärmt und in dampfförmiger Phase vorliegen kann, in den Rücklauf geleitet, welcher das Helium oberhalb des Heliumspiegels in das Heliumvorratsgefäß zurückleitet. Für die Heliumumwälzung ist keine Pumpe erforderlich, sie erfolgt durch Konvektion.This object is achieved in that a winding body for the superconducting winding has a lower supply channel and an upper collecting channel parallel to the horizontal magnetic axis and parallel cooling channels that connect the supply channel and the collecting channel with each other, and that the supply channel with the outflow of a compared to the winding body, the helium vessel is arranged in a higher position. Flow line is connected, and the collecting duct is connected via a return line to a connecting piece of the helium vessel. The liquid helium can flow through the outflow of the helium vessel into the lower feed channel and from there rises in parallel through the cooling channels into the upper collecting channel. From the collecting channel, the helium, which in the meantime has been heated and can be in the vapor phase, is passed into the return line, which directs the helium above the helium level back into the helium storage vessel. No pump is required for the helium circulation, it is done by convection.

Der Wickelkörper läßt sich vorteilhaft durch Rollnahtschweißen und Aufblasen der Kühlkanäle fertigen, wobei dafür Sorge getragen Wird, daß die Wölbung der aufgeblasenen Kühlkanäle zu der Wicklung abgewandten.Seite erfolgt. Dies ermöglicht eine preisgünstige Herstellung bei hoher Qualität.The winding body can advantageously be produced by roller seam welding and inflating the cooling channels, care being taken to ensure that the curvature of the inflated cooling channels faces away from the winding he follows. This enables inexpensive production with high quality.

Der Wickelkörper kann aus austenitischem Stahl oder Aluminium gefertigt werden, wobei letzteres Material die Quenchsicherheit nach dem "quench bare"-Prinzip erhöht.The winding body can be made of austenitic steel or aluminum, the latter material increasing the quench security according to the "quench bare" principle.

Eine vorteilhafte Ausgestaltung der Erfindung sieht vor, daß in das Heliumvorratsgefäß das Ende des Kaltkopfes eines Minirefrigerators, der z.B.nach dem Gifford-McMahon-Prinzip arbeitet, ragt. Die Temperatur des Kaltkopfendes liegt bei 4,2 K oder darunter. Das Ende des Kaltkopfes ragt in den-Gasraum des Heliumvorratsgefäßes und rekondensiert das durch den Rücklauf zurückströmende Heliumgas.An advantageous embodiment of the invention provides that the end of the cold head of a mini-refrigerator, which works according to the Gifford-McMahon principle, for example, protrudes into the helium storage vessel. The temperature of the cold head end is 4.2 K or below. The end of the cold head protrudes into the gas space of the helium storage vessel and recondenses the helium gas flowing back through the return.

Für das erste Abkühlen des Wickelkörpers ist in der Regel die Verwendung eines Minirefrigerators ungeeignet. Hierfür sieht die Erfindung in einer zweckmäßigen Ausgestaltung vor, daß das Heliumvorratsgefäß einen Anschlußflansch für einen Heliumheber aufweist, der über dem Ausfluß anordenbar ist. Für das Auffüllen des Systems mit flüssigem Helium wird der Heliumheber durch den Anschlußflansch soweit hindurchgeschoben, daß er teilweise in die Vorlaufleitung hineinragt und eingeschraubt wird. Das andere Ende des Heliumhebers ragt in eine Heliumkanne. Es wird soviel Helium aus der Heliumkanne in das Heliumvorratsgefäß und den Wickelkörper geleitet, bis diese abgekühlt und bis zu einer bestimmten Höhe gefüllt sind. Das Heliumvorratsgefäß enthält ebenfalls eine verschließbare Öffnung, durch die das noch warme, gasförmige Helium austreten kann.The use of a mini-frigator is generally unsuitable for the first cooling of the winding body. For this purpose, the invention provides in an expedient embodiment that the helium storage vessel has a connecting flange for a helium lifter, which can be arranged above the outflow. To fill the system with liquid helium, the helium lifter is pushed through the connecting flange until it partially protrudes into the supply line and is screwed in. The other end of the helium lifter protrudes into a helium can. So much helium is passed from the helium can into the helium storage container and the winding former until these have cooled and are filled to a certain height. The helium storage vessel also contains a closable opening through which the still warm, gaseous helium can escape.

Anhand der Zeichnung, in der ein Ausführungsbeispiel der Erfindung gezeigt ist, sollen die Erfindung sowie weitere vorteilhafte Ausgestaltungen und Weiterbildungen näher erläutert werden.Based on the drawing, in which an embodiment of the Invention is shown, the invention and further advantageous refinements and developments are to be explained in more detail.

Es zeigt:

  • Fig. 1 eine schematische Darstellung des erfindungsgemäßen Kühlsystems und
  • Fig. 2 den Querschnitt einer in einem Kryostaten befindlichen supraleitenden Spule.
It shows:
  • Fig. 1 is a schematic representation of the cooling system according to the invention and
  • Fig. 2 shows the cross section of a superconducting coil located in a cryostat.

In der Figur 1 ist ein zylindrischer Wickelkörper 10 dargestellt, in dess.en Zylinderfläche Kühlkanäle eingebettet sind. Im unteren Bereich des Wickelkörpers 10 verläuft axial ein Zuleitungskanal 11 und im oberen-Bereich des Wickelkörpers 10 verläuft axial ein Sammelkanal 12. Der Zuleitungskanal 11 und der Sammelkanal 12 sind durch mehrere, parallel geführte in die Innenseite des Wiokelkörpers 10 eingebettete Kühlkanäle 13 verbunden.1 shows a cylindrical winding body 10, in whose cooling surface cooling channels are embedded. A feed channel 11 runs axially in the lower area of the winding body 10 and a collecting channel 12 runs axially in the upper area of the winding body 10.

Die Herstellung eines derartigen Wickelkörpers 10 kann durch Rollnahtschweißen und anschließendes Aufblasen der Kühlkanäle erfolgen.Such a winding body 10 can be produced by roller seam welding and subsequent inflation of the cooling channels.

Der untere Zuleitungskanal 11 ist über eine Vorlaufleitung 14 mit dem Bodenausfluß 15 eines Heliumvorratsgefäßes 16 verbunden. Durch diese Leitungen kann das flüssige Helium aus dem Heliumvorratsgefäß 16 in die Kühlkanäle 13 geleitet werden. Über den oberen Sammelkanal 12 wird das erwärmte Helium (in flüssiger oder gasförmiger Phase) gesammelt und gelangt über den Rücklauf 17 in den oberen Bereich des Heliumvorratsgefäßes 16. Der Heliumspiegel 18 im Vorratsgefäß 16 liegt unterhalb des Rücklaufeintrittes. In den Gasraum des Heliumvorratsgefäßes 16 ragt das Ende 20 des mit einem Kompressor 21 verbundenen Kaltkopfes 22 eines Minirefrigerators. Das Ende 20 des Kaltkopfes 22 weist eine hinreichend niedrige Temperatur auf um das gasförmige Helium zurückzukondensieren.The lower feed channel 11 is connected to the bottom outlet 15 of a helium storage vessel 16 via a feed line 14. The liquid helium can be conducted from the helium storage vessel 16 into the cooling channels 13 through these lines. The heated helium (in the liquid or gaseous phase) is collected via the upper collecting channel 12 and reaches the upper region of the helium storage vessel 16 via the return 17. The helium level 18 in the storage vessel 16 lies below the return inlet. In the gas space of the helium storage vessel 16, the end 20 of the protrudes with one Compressor 21 connected cold head 22 of a mini fridge. The end 20 of the cold head 22 has a sufficiently low temperature to condense the gaseous helium back.

Ferner weist das Heliumvorratsgefäß 16 einen Anschlußflansch 23 auf, durch den ein Heliumheber 24 gesteckt ist. Der Anschlußflansch 23 liegt über dem Bodenausfluß 15. Für eine erste Füllung des Systems wird der Heliumheber 24 in die Vorlaufleitung 14 eingeschoben und verschraubt.Furthermore, the helium storage vessel 16 has a connecting flange 23 through which a helium lifter 24 is inserted. The connecting flange 23 lies above the bottom outlet 15. For a first filling of the system, the helium lifter 24 is pushed into the feed line 14 and screwed.

Der Figur 2 ist der Querschnitt einer Magnetwicklung 25 mit Kühl- und Vakuumsystem entnehmbar. Die Magnetwicklung 25 ist konzentrisch um eine Untersuchungsöffnung 26 angeordnet und besteht aus supraleitendem Draht. Die supraleitende Wicklung 25 ist auf einen Wickelkörper 10 aufgebracht, der gemäß Fig. 1 ausgebildet ist. Es sind in Figur 2 der Zuleitungskanal 11, der Sammelkanal 12 sowie zwei Kühlkanäle 13 erkennbar. Magnetwicklung 25 und Spulenträger 10 werden allseits durch Kälteschilde 27,28 abgeschirmt. Das gesamte System ist in einem Vakuumbehälter, bestehend aus innerem Mantel 29 und äußerem Mantel 30 untergebracht.FIG. 2 shows the cross section of a magnetic winding 25 with a cooling and vacuum system. The magnet winding 25 is arranged concentrically around an examination opening 26 and consists of superconducting wire. The superconducting winding 25 is applied to a winding body 10 which is designed according to FIG. 1. The supply duct 11, the collecting duct 12 and two cooling ducts 13 can be seen in FIG. Magnet winding 25 and coil carrier 10 are shielded on all sides by cold shields 27, 28. The entire system is housed in a vacuum container consisting of an inner jacket 29 and an outer jacket 30.

Claims (5)

1. Kühlsystem für indirekt gekühlte supraleitende Magnete mit von flüssigem Helium durchflossenen Kühlkanälen, die in engem thermischen Kontakt mit der supraleitenden Wicklung (25) stehen, dadurch gekennzeichnet, daß ein Wickelkörper (10) einen unteren Zuleitungskanal (11) und einen oberen Sammelkanal (12) sowie parallel geschaltete Kühlkanäle (13), die den Zuleitungskanal (11) und den Sammelkanal (12) miteinander verbinden, aufweist und daß der Zuleitungskanal (11) mit dem Ausfluß (15) eines gegenüber dem Wickelkörper (10) erhöht angeordneten Heliumgefäßes (16) über eine Vorlaufleitung (14) verbunden ist und der Sammelkanal (12) über einen Rücklauf (17) mit einem Anschlußstutzen (19) des Heliumvorratsgefäßes (16) verbunden ist.1. Cooling system for indirectly cooled superconducting magnets with cooling channels through which liquid helium flows and which are in close thermal contact with the superconducting winding (25), characterized in that a winding body (10) has a lower supply channel (11) and an upper collecting channel (12 ) and cooling ducts (13) connected in parallel, which connect the inlet duct (11) and the collecting duct (12) to each other, and that the inlet duct (11) with the outflow (15) of a helium vessel (16 ) is connected via a flow line (14) and the collecting duct (12) is connected via a return line (17) to a connecting piece (19) of the helium storage vessel (16). 2. Kühlsystem nach Anspruch 1, dadurch gekennzeichnet, daß der Wickelkörper (10) durch Rollnahtschweißen und Aufblasen der Kühlkanäle (11,12,13) gefertigt ist.2. Cooling system according to claim 1, characterized in that the winding body (10) is made by roller seam welding and inflating the cooling channels (11, 12, 13). 3. Kühlsystem nach Anspruch 1. oder 2, dadurch gekennzeichnet, daß in das Heliumvorratsgefäß ( 16) das Ende (20) des Kaltkopfes (22) eines Minirefrigerators ragt.3. Cooling system according to claim 1 or 2, characterized in that in the helium storage vessel (16) the end (20) of the cold head (22) of a mini-refrigerator projects. 4. Kühlsystem nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Heliumvorratsgefäß (16) einen Anschlußflansch (23) für einen Heliumheber (24) aufweisen, der sich über dem Bodenausfluß (15) befindet, wodurch das Einführen des Heliumhebers (24) in die Vorlaufleitung (14) ermöglicht wird.4. Cooling system according to one of claims 1 to 3, characterized in that the helium storage vessel (16) has a connecting flange (23) for a helium lifter (24) which is located above the bottom outlet (15), thereby introducing the helium lifter (24 ) is made possible in the flow line (14). 5. Kühlsystem nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß der Wickelkörper (10) mit integrierten Kühlkanälen aus Reinstaluminium ist und damit als queneh bare zur Quenchsicherheit dient.5. Cooling system according to one of claims 1 to 4, characterized in that the winding body (10) with integrated cooling channels is made of pure aluminum and thus serves as queneh bare for quench safety.
EP84114197A 1983-12-06 1984-11-23 Cooling system for indirectly cooled superconducting magnets Expired EP0144873B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3344046 1983-12-06
DE19833344046 DE3344046A1 (en) 1983-12-06 1983-12-06 COOLING SYSTEM FOR INDIRECTLY COOLED SUPRALINE MAGNETS

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EP0144873A2 true EP0144873A2 (en) 1985-06-19
EP0144873A3 EP0144873A3 (en) 1986-02-12
EP0144873B1 EP0144873B1 (en) 1988-01-27

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US9623215B2 (en) 2012-06-01 2017-04-18 Surmodics, Inc. Apparatus and methods for coating medical devices
US9827401B2 (en) 2012-06-01 2017-11-28 Surmodics, Inc. Apparatus and methods for coating medical devices
US11090468B2 (en) 2012-10-25 2021-08-17 Surmodics, Inc. Apparatus and methods for coating medical devices
US11628466B2 (en) 2018-11-29 2023-04-18 Surmodics, Inc. Apparatus and methods for coating medical devices
US11819590B2 (en) 2019-05-13 2023-11-21 Surmodics, Inc. Apparatus and methods for coating medical devices

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EP0144873B1 (en) 1988-01-27
DE3469095D1 (en) 1988-03-03
DE3344046C2 (en) 1987-06-25
EP0144873A3 (en) 1986-02-12
US4578962A (en) 1986-04-01
DE3344046A1 (en) 1985-06-20

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