EP0379224A2 - Directly cooled superconductor cavity - Google Patents

Directly cooled superconductor cavity Download PDF

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Publication number
EP0379224A2
EP0379224A2 EP90101117A EP90101117A EP0379224A2 EP 0379224 A2 EP0379224 A2 EP 0379224A2 EP 90101117 A EP90101117 A EP 90101117A EP 90101117 A EP90101117 A EP 90101117A EP 0379224 A2 EP0379224 A2 EP 0379224A2
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Prior art keywords
niobium
outer shell
copper
shell
ring
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EP90101117A
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German (de)
French (fr)
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EP0379224A3 (en
Inventor
Erwin Dipl.-Ing.; Stoop
Günter Dipl.-Ing.; Broden
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Dornier GmbH
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Dornier GmbH
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
    • H05H7/14—Vacuum chambers
    • H05H7/18—Cavities; Resonators
    • H05H7/20—Cavities; Resonators with superconductive walls

Definitions

  • the invention relates to a superconducting cavity comprising a thin-walled inner shell and an outer support and cooling shell.
  • Superconducting accelerators are used in high-energy physics, which are cooled to 2 - 4 ° K with liquid helium. Pure niobium is used as the superconducting material. Niobium is very expensive, is a poor heat conductor and has low strength.
  • the first design a large amount of helium is required in addition to the expensive niobium cavity.
  • the amount of helium could be reduced considerably with the second design, but the costs of the niobium cavity increase due to the applied silver layer.
  • the cavity is cheaper, but the quality of the sputter layer still has to be optimized and the amount of helium required is again large.
  • the fourth and fifth design already saves large amounts of helium, and the use of thin niobium sheets means that the cost factor for niobium is low, but the thick-walled copper shell makes it difficult or impossible to adjust the frequency of the cavity.
  • the object of the invention is to demonstrate a superconducting davity which, when using the smallest possible amounts of niobium and helium, enables good frequency tuning, with sufficient cooling and strength being ensured.
  • An outer shell which completely encloses the inner shell, is applied to an inner shell in the predetermined shape of the cavity.
  • the inner shell is made of a superconducting material such as niobium or it is made of a normally conductive material which is provided with a superconducting coating.
  • a corrugated outer shell is attached to the inner shell.
  • the wave shape of the outer shell has several advantages. A coolant can be introduced between the individual shafts of the shell.
  • the more stable outer shell also serves to support the thinner inner shell, and the waveform according to the invention makes it possible, despite the stability of the outer shell, to frequency tune the total cavity by applying axial compressive or tensile forces.
  • corrugated rings can also be provided, which are attached next to one another on the inner shell.
  • the coolant for example helium
  • devices for supplying and discharging the coolant are provided on the rings or on the shell and the connection between the inner and outer shell is helium-tight.
  • Niobium is mainly used as the material for the outer shell or the outer rings. Instead of niobium, for example, stainless steel or copper can also be used. Copper has sufficient strength and excellent thermal conductivity.
  • the fastening technology used to connect the inner shell and outer shell or outer ring depends on the material used.
  • the construction of a thin inner shell and of pressed sheets or of geometrically simple rings for the outer shell means that the composite cavity according to the invention can be produced cost-effectively.
  • the cavity is insensitive to pressure fluctuations in the supply of coolant; the frequency values once set are not influenced, for example, by pressure fluctuations in a helium supply.
  • the axial pressures or tensile pressures to be undertaken to tune, i.e. to fine-tune the frequency of the cavity, show an almost linear dependence of the length on the compressive force.
  • the connection strength achieved between the inner and outer shell exceeds the strength of the copper. A separation of niobium and copper is not possible without destroying the cavity.
  • FIG. 1 shows the vertical section through two cavity half-shells 2 and 4.
  • the two half-shells 2 and 4 are connected to one another.
  • Each half-shell 2 and 4 which form the inner shells, have two further half-shells 6 and 8 on the outside, which are curved in a wave shape.
  • the shells 6 and 8 are firmly connected to the inner shells 2 and 4.
  • the outer shells are also connected via an intermediate ring 10.
  • the inner shells are at the point with the smallest diameter with the next Cavity connected in an appropriate form.
  • the outer shells are in turn connected to the next outer shell via intermediate rings 14.
  • the circular circumferential seam 16 shows the connection point between two half-shells at their largest diameter.
  • FIG. 2 shows the different connection options between the inner shell and outer shell, both of which can also each consist of different materials.
  • a copper outer shell is connected to a niobium inner shell via a soldering surface.
  • the outer shell is made of stainless steel and the inner shell of niobium.
  • a copper ring is soldered between the two shells.
  • FIG. 2c between a copper outer shell and a niobium inner shell, there is provided a copper ring which is provided with a recess and which electrons with the copper outer shell ring soldered, which in turn is electron beam welded to the niobium inner shell.
  • a copper outer shell is soldered to a copper inner shell.
  • FIG. 2e shows an outer copper shell and an inner copper shell, which are electron beam welded together.
  • the same is shown in Figure 2f for the material niobium.
  • a stainless steel ring with a recess is welded to a stainless steel outer shell.
  • a copper ring is soldered onto this stainless steel ring and a niobium ring is also soldered onto this copper ring, which in turn is then electron beam welded to the niobium inner shell.
  • FIG. 2h shows an outer niobium shell and an inner niobium shell, which is connected via an intermediate soldered copper ring.
  • the outer shell is replaced by a ring 20 which is bent out in a wave shape and is connected to the inner shell 22. All material combinations and connection techniques of Figures 2a to 2h are possible.
  • For the supply of the coolant holes are provided in the outer crests of the outer shell, which are connected via pipes to a coolant source.
  • the invention reduces the need for expensive materials for both manufacturing and operating the cavity. Nevertheless, good and sufficient cooling is achieved and sufficient stability of the inner shell is guaranteed.
  • the frequency of the cavity can be reduced in a simple manner by the construction according to the invention.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Particle Accelerators (AREA)

Abstract

The invention relates to a superconductor cavity in which a thin- walled inner shell is surrounded by an undulating outer shell or by rings, where the inner shell is supported and adequate flexibility is provided by the undulating shape to enable fine-tuning of the cavity frequency. Coolant is provided which is supplied via feed lines to the troughs of the undulations between the inner shell and outer shell. <IMAGE>

Description

Die Erfindung betrifft eine supraleitende Cavity aus einer dünnwandigen Innenschale und einer aussenliegenden Stütz- und Kühlschale.The invention relates to a superconducting cavity comprising a thin-walled inner shell and an outer support and cooling shell.

In der Hochenergiephysik werden supraleitende Beschleuniger eingesetzt, die mit flüssigem Helium auf 2 - 4° K gekühlt werden. Als supraleitender Werkstoff wird hierbei reines Niob verwendet. Niob ist sehr teuer, ein schlechter Wärme­leiter und hat eine niedrige Festigkeit.Superconducting accelerators are used in high-energy physics, which are cooled to 2 - 4 ° K with liquid helium. Pure niobium is used as the superconducting material. Niobium is very expensive, is a poor heat conductor and has low strength.

Als "Cavities" werden allgemein Hohlraum-Rsonatoren für Elektronen- oder Protonenbeschleunigungsanlagen bezeichnet. Sie werden mit einem Hochfrequenz-Wechselfeld gespeist und dienen der schrittweisen Beschleunigung von Teilchen, wie beispielsweise Elektronen, Positronen oder Protonen, bis zum Erreichen ihrer vorgesehenen Kollisionsenergie.
Die Cavities bekannter Art sind aus miteinander verschweiss­ten Niob- oder Kupferschalen aufgebaut. Jeweils benachbarte Schalen sind mit ihrem grösseren beziehungsweise mit ihrem kleineren Durchmesser miteinander verschweisst, so dass ins­gesamt ein Hohlraum mit sich periodisch vergrösserndem und verkleinerndem Durchmesser entsteht.
Bereits seit einigen Jahren wird Niob als Material für supraleitende Cavities zur Teilchenbeschleunigung einge­setzt. Dabei liegt die Sprungtemperatur von Niob bei 9.25°K, unterhalb dieser Temperatur ist Niob supraleitend, sein elektrischer Widerstand ist 10⁶ mal kleiner als der Wider­stand von Kupfer.
In der Technik sind fünf Bauartvarianten für supraleitende Cavities bekannt:

  • 1. Cavities aus reinem Niob, aus dem Vollen gearbeitet oder aus Blech, eingebaut in einen Flüssig-Helium-Tank.
  • 2. Cavities aus reinem Niob, mit einer auf der Aussenhaut aufgebrachten Silberschicht und aufgelöteten Kühlrohren aus Kupfer (DESY).
  • 3. Cavities aus Kupfer, mit einer auf der Innenseite auf­gesputterten dünnen Niob-Schicht, eingebaut in einen Flüssig-Helium-Tank (CERN).
  • 4. Cavities aus einer dickwandigen Kupferschale und einem darin heliumdicht befestigten dünnen Niob-Blech, wobei in der Kupferschale Kühlkanäle eingebracht sind.
  • 5. Cavities aus sprengverschweisstem Niob und Kupfer. Auf die Kupferschale werden Kühlrohre aufgeschweisst.
Cavities are generally referred to as cavity resonators for electron or proton acceleration systems. They are fed with a high-frequency alternating field and are used to gradually accelerate particles such as electrons, positrons or protons until they reach their intended collision energy.
The cavities of known type are made up of welded niobium or copper shells. In each case, adjacent shells are welded to one another with their larger or with their smaller diameter, so that overall a cavity with a periodically increasing and decreasing diameter is created.
Niobium has been used as a material for superconducting cavities for particle acceleration for several years. The jump temperature of niobium is 9.25 ° K, below this temperature niobium is superconducting, its electrical resistance is 10⁶ times less than the resistance of copper.
Five types of construction for superconducting cavities are known in technology:
  • 1. Cavities made of pure niobium, made of solid or made of sheet metal, installed in a liquid helium tank.
  • 2. Cavities made of pure niobium, with a silver layer on the outer skin and soldered cooling tubes made of copper (DESY).
  • 3. Copper cavities, with a thin layer of niobium sputtered on the inside, built into a liquid helium tank (CERN).
  • 4. Cavities made of a thick-walled copper shell and a thin niobium sheet fixed helium-tight therein, cooling channels being introduced into the copper shell.
  • 5. Cavities made of explosive welded niobium and copper. Cooling pipes are welded onto the copper bowl.

Bei der ersten Bauart wird neben der teuren Niob-Cavity noch zusätzlich eine grosse Menge Helium benötigt. Die Helium­menge konnte bei der zweiten Bauart erheblich reduziert werden, aber die Kosten der Niob-Cavity erhöhen sich durch die aufgetragene Silberschicht. Bei der dritten Bauart ist die Cavity billiger, jedoch muss die Qualität der Sputter­schicht noch optimiert werden und die erforderliche Helium­menge ist wiederum gross. Die vierte und fünfte Bauart spart bereits grosse Mengen an Helium ein und durch die Verwendung der dünnen Niob-Bleche ist auch der Kostenfaktor für Niob niedrig, jedoch lässt sich durch die dickwandige Kupfer­schale die Frequenznachstimmung der Cavity nicht oder nur erschwert durchführen.In the first design, a large amount of helium is required in addition to the expensive niobium cavity. The amount of helium could be reduced considerably with the second design, but the costs of the niobium cavity increase due to the applied silver layer. With the third design, the cavity is cheaper, but the quality of the sputter layer still has to be optimized and the amount of helium required is again large. The fourth and fifth design already saves large amounts of helium, and the use of thin niobium sheets means that the cost factor for niobium is low, but the thick-walled copper shell makes it difficult or impossible to adjust the frequency of the cavity.

Der Erfindung liegt die Aufgabe zugrunde, eine supraleitende Davity aufzuzeigen, die bei Verwendung von möglichst gerin­gen Mengen an Niob und Helium eine gute Frequenzabstimmung ermöglicht, wobei ausreichende Kühlung und Festigkeit ge­währleistet sind.The object of the invention is to demonstrate a superconducting davity which, when using the smallest possible amounts of niobium and helium, enables good frequency tuning, with sufficient cooling and strength being ensured.

Diese Aufgabe wir durch die Cavity nach Anspruch 1 gelöst. Ausgestaltungen sind Bestandteile von Unteransprüchen.This problem is solved by the cavity according to claim 1. Refinements are components of subclaims.

Auf eine Innenschale in der vorgegebenen Form der Cavity wird eine äussere Schale aufgebracht, die die innere Schale vollständig einschliesst. Die innere Schale ist aus einem supraleitenden Material wie beispielsweise Niob hergestellt oder aber sie besteht aus einem normalleitenden Werkstoff, der mit einer supraleitenden Beschichtung versehen ist. Um dieser inneren Schale Kühlung und Stabilität zu verleihen, wird eine gewellte äussere Schale an der inneren Schale be­festigt. Durch die Wellenform der äusseren Schale ergeben sich mehrere Vorteile. Zwischen den einzelnen Wellen der Schale kann eine Kühlflüssigkeit eingeleitet werden. Eben­falls dient die stabilere Aussenschale zur Stützung der dünneren inneren Schale und durch die erfindungsgemässe Wellenform ist trotz der Stabilität der äusseren Schale ein Frequenznachtunen der Gesamtcavity durch Aufbringung von axialen Druck- oder Zugkräften möglich.An outer shell, which completely encloses the inner shell, is applied to an inner shell in the predetermined shape of the cavity. The inner shell is made of a superconducting material such as niobium or it is made of a normally conductive material which is provided with a superconducting coating. To give this inner shell cooling and stability, a corrugated outer shell is attached to the inner shell. The wave shape of the outer shell has several advantages. A coolant can be introduced between the individual shafts of the shell. The more stable outer shell also serves to support the thinner inner shell, and the waveform according to the invention makes it possible, despite the stability of the outer shell, to frequency tune the total cavity by applying axial compressive or tensile forces.

Statt einer zusammengehörigen Aussenschale können auch mehrere gewellte Ringe vorgesehen sein, die nebeneinander an der inneren Schale angebracht sind. Auch durch diese ge­wellten Ringe lässt sich die Kühlflüssigkeit, beispielsweise Helium, leiten. Dazu sind an den Ringen oder an der Schale Vorrichtungen zur Zu- und Abführung des Kühlmittels vorge­sehen und die Verbindung zwischen Innen- und Aussenschale ist heliumdicht.Instead of a corresponding outer shell, several corrugated rings can also be provided, which are attached next to one another on the inner shell. The coolant, for example helium, can also be conducted through these corrugated rings. For this purpose, devices for supplying and discharging the coolant are provided on the rings or on the shell and the connection between the inner and outer shell is helium-tight.

Als Werkstoff für die äussere Schale oder die äusseren Ringe ist vorwiegend Niob vorgesehen. Statt Niob ist aber auch beispielsweise Edelstahl oder Kupfer anwendbar. Kupfer be­sitzt eine ausreichende Festigkeit und eine ausgezeichnete Wärmeleitfähigkeit. Nach dem verwendetem Werkstoff richtet sich die Befestigungstechnik, mit der innere Schale und äussere Schale oder äusserer Ring miteinander verbunden werden.
Durch den Aufbau aus dünner Innerschale und aus gedrückten Blechen oder aus geometrisch einfachen Ringen für die äus­sere Schale ist eine kostengünstige Herstellung der erfin­dungsgemässen Verbundcavity gegeben. Gegenüber Druckschwan­kungen in der Versorgung mit Kühlmittel ist die Cavity un­empfindlich, die einmal eingestellten Frequenzwerte werden beispielsweise durch Druckschwankungen in einer Helium-Ver­sorgung nicht beeinflusst.Niobium is mainly used as the material for the outer shell or the outer rings. Instead of niobium, for example, stainless steel or copper can also be used. Copper has sufficient strength and excellent thermal conductivity. The fastening technology used to connect the inner shell and outer shell or outer ring depends on the material used.
The construction of a thin inner shell and of pressed sheets or of geometrically simple rings for the outer shell means that the composite cavity according to the invention can be produced cost-effectively. The cavity is insensitive to pressure fluctuations in the supply of coolant; the frequency values once set are not influenced, for example, by pressure fluctuations in a helium supply.

Die zum Tunen, also zum Feineinstellen der Frequenz der Cavity, vorzunehmenden axialen Druck- oder Zugbeaufschla­gungen zeigen eine nahezu lineare Abhängigkeit der Länge von der Druckkraft. Die zwischen Innen- und Aussenschale erreichte Verbindungsfestigkeit übersteigt die Festigkeit des Kupfers. Eine Trennung von Niob und Kupfer ist ohne Zerstörung der Cavity nicht möglich.The axial pressures or tensile pressures to be undertaken to tune, i.e. to fine-tune the frequency of the cavity, show an almost linear dependence of the length on the compressive force. The connection strength achieved between the inner and outer shell exceeds the strength of the copper. A separation of niobium and copper is not possible without destroying the cavity.

Die Erfindung wird anhand von Figuren näher erläutert.The invention is explained in more detail with reference to figures.

Es zeigen:

  • Figur 1 den Schnitt durch eine Cavity-Anordnung mit erfindungsgemässem Aufbau,
  • Figur 2a bis i verschiedene Befestigungsvariationen der Schalen.
Show it:
  • FIG. 1 shows the section through a cavity arrangement with a structure according to the invention,
  • Figure 2a to i different attachment variations of the Peel.

Die Figur 1 zeigt den senkrechten Schnitt durch zwei Cavity-­Halbschalen 2 und 4. Im Punkt 5 sind die beiden Halbschalen 2 und 4 miteinander verbunden. Jede Halbschale 2 und 4, die die Innenschalen bilden, besitzen aussen zwei weitere Halb­schalen 6 und 8, die wellenförmig gebogen sind. Die Schalen 6 und 8 sind fest mit den Innenschalen 2 und 4 verbunden. In den Bereichen, in denen die Innenschalen 2 und 4 mitein­ander verbunden sind, sind auch die äusseren Schalen über einen Zwischenring 10 verbunden. Ebenso sind die Innenschalen an der Stelle mit engstem Durchmesser mit der nächsten
Cavity in entsprechender Form verbunden. An diesen Stellen sind auch die Aussenschalen wiederum über Zwischenringe 14 mit der jeweils nächsten Aussenschale verbunden. In den Räumen 12 zwischen Aussenschalen und Innenschalen befindet sich das Kühlmittel, das über hier nicht gezeigte Verbin­dungsleitungen zu- und abgeführt wird. Die kreisförmig um­laufende Naht 16 zeigt die Verbindungsstelle zwischen zwei Halbschalen an deren grösstem Durchmesser.FIG. 1 shows the vertical section through two cavity half-shells 2 and 4. At point 5, the two half-shells 2 and 4 are connected to one another. Each half-shell 2 and 4, which form the inner shells, have two further half-shells 6 and 8 on the outside, which are curved in a wave shape. The shells 6 and 8 are firmly connected to the inner shells 2 and 4. In the areas in which the inner shells 2 and 4 are connected to one another, the outer shells are also connected via an intermediate ring 10. Likewise, the inner shells are at the point with the smallest diameter with the next
Cavity connected in an appropriate form. At these points, the outer shells are in turn connected to the next outer shell via intermediate rings 14. In the spaces 12 between the outer and inner shells is the coolant, which is supplied and discharged via connecting lines, not shown here. The circular circumferential seam 16 shows the connection point between two half-shells at their largest diameter.

Die verschiedenen Verbindungsmöglichkeiten zwischen Innen­schale und Aussenschale, die beide jeweils auch aus ver­schiedenen Materialien bestehen können, zeigt die Figur 2. In Figur 2a ist eine Kupfer-Aussenschale mit einer Niob-­Innenschale über eine Lötfläche verbunden.
In Figur 2b besteht die Aussenschale aus Edelstahl und die Innenschale aus Niob. Zwischen beiden Schalen wird ein Kupferring zwischengelötet.
In Figur 2c ist zwischen einer Kupfer-Aussenschale und einer Niob-Innenschale ein mit einer Vertiefung versehener Kupfer­ring vorgesehen, der mit der Kupfer-Aussenschale elektronen­ ring angelötet, der wiederum mit der Niob-Innenschale elek­tronenstrahlverschweisst ist.
In Figur 2d ist eine Kupfer-Aussenschale mit einer Kupfer-­Innenschale verlötet.
Die Figur 2e zeigt eine Kupfer-Aussenschale und eine Kupfer-­Innenschale, die miteinander elektronenstrahlverschweisst sind.
Entsprechendes zeigt Figur 2f für das Material Niob.
In Figur 2g wird an eine Edelstahl-Aussenschale ein Edel­stahl-Ring mit Vertiefung angeschweisst. An diesen Edel­stahl- Ring wird ein Kupferring angelötet und an diesen Kupferring ein Niobring ebenfalls angelötet, der dann wiederum mit der Niob-Innenschale elektronenstrahlver­schweisst ist.
Die Figur 2h zeigt eine Niob-Aussenschale und eine Niob-­Innenschale, die über einen zwischengelöteten Kupferring verbunden ist.
In Figur 2i ist die Aussenschale durch einen Ring 20 er­setzt, der wellenförmig ausgebogen und mit der Innenschale 22 verbunden ist. Dabei sind alle Werkstoffkombinationen und Verbindungstechniken der Figuren 2a bis 2h möglich.
Zur Zuleitung der Kühlmittel sind in den nach aussen liegen­den Wellenbergen der Aussenschale Bohrungen vorgesehen, die über Rohrleitungen mit einer Kühlmittelquelle verbunden sind.FIG. 2 shows the different connection options between the inner shell and outer shell, both of which can also each consist of different materials. In FIG. 2a, a copper outer shell is connected to a niobium inner shell via a soldering surface.
In Figure 2b, the outer shell is made of stainless steel and the inner shell of niobium. A copper ring is soldered between the two shells.
In FIG. 2c, between a copper outer shell and a niobium inner shell, there is provided a copper ring which is provided with a recess and which electrons with the copper outer shell ring soldered, which in turn is electron beam welded to the niobium inner shell.
In Figure 2d, a copper outer shell is soldered to a copper inner shell.
FIG. 2e shows an outer copper shell and an inner copper shell, which are electron beam welded together.
The same is shown in Figure 2f for the material niobium.
In Figure 2g, a stainless steel ring with a recess is welded to a stainless steel outer shell. A copper ring is soldered onto this stainless steel ring and a niobium ring is also soldered onto this copper ring, which in turn is then electron beam welded to the niobium inner shell.
FIG. 2h shows an outer niobium shell and an inner niobium shell, which is connected via an intermediate soldered copper ring.
In Figure 2i, the outer shell is replaced by a ring 20 which is bent out in a wave shape and is connected to the inner shell 22. All material combinations and connection techniques of Figures 2a to 2h are possible.
For the supply of the coolant, holes are provided in the outer crests of the outer shell, which are connected via pipes to a coolant source.

Die Erfindung verringert den Bedarf an teuren Materialien sowohl zur Herstellung als auch zum Betreiben der Cavity. Dennoch wird eine gute und ausreichende Kühlung erzielt und ausreichende Stabilität der Innenschale gewährleistet. Das Nachtunen der Frequenz der Cavity ist durch erfindungs­gemässen Aufbau in einfacher Weise möglich.The invention reduces the need for expensive materials for both manufacturing and operating the cavity. Nevertheless, good and sufficient cooling is achieved and sufficient stability of the inner shell is guaranteed. The frequency of the cavity can be reduced in a simple manner by the construction according to the invention.

Claims (12)

1. Supraleitende Cavity mit dünnwandiger Innenschale und die Innenschale umgebender Aussenschale, da­durch gekennzeichnet, dass die Aussenschale eine wellenförmige Struktur aufweist, an den zur Innenschale liegenden Wellenbergen mit der Innenschale verbunden ist und Vorrichtungen zur Zu- und Abführung von Kühlmitteln in durch die Wellenform ge­bildete Räume zwischen Innenschale und Aussenschale vor­gesehen sind.1. Superconducting cavity with thin-walled inner shell and outer shell surrounding the inner shell, characterized in that the outer shell has a wave-shaped structure, is connected to the inner shell at the wave crests lying to the inner shell, and devices for supplying and removing coolants into spaces formed by the waveform are provided between the inner shell and outer shell. 2. Cavity nach Anspruch 1, dadurch gekennzeichnet, dass die Aussenschale aus einem wellenförmig gebogenen Teil besteht.2. Cavity according to claim 1, characterized in that the outer shell consists of an undulating part. 3. Cavity nach Anspruch 1, dadurch gekennzeichnet, dass die Aussenschale mehrteilig und aus einzelnen Ringen aufgebaut ist.3. Cavity according to claim 1, characterized in that the outer shell is constructed in several parts and from individual rings. 4. Cavity nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Aussenschale aus Niob und die Innenschale aus Niob besteht und beide miteinander verschweisst sind.4. Cavity according to claim 2 or 3, characterized in that the outer shell consists of niobium and the inner shell of niobium and both are welded together. 5. Cavity nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Aussenschale aus Kupfer und die Innenschale aus Niob besteht und beide miteinander verlötet sind.5. Cavity according to claim 2 or 3, characterized in that the outer shell made of copper and the inner shell consists of niobium and both are soldered together. 6. Cavity nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Aussenschale aus Kupfer und die Innenschale aus Kupfer mit einer supraleitenden Beschichtung be­steht und beide Schalen miteinander verlötet sind.6. Cavity according to claim 2 or 3, characterized in that the outer shell made of copper and the inner shell made of copper with a superconducting coating and both shells are soldered together. 7. Cavity nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Aussenschale aus Kupfer und die Innenschale aus Kupfer mit einer supraleitenden Beschichtung be­steht und beide Schalen miteinader verschweisst sind.7. Cavity according to claim 2 or 3, characterized in that the outer shell made of copper and the inner shell made of copper with a superconducting coating and both shells are welded together. 8. Cavity nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Aussenschale aus Niob und die Innenschale aus Niob besteht und beide miteinander über einen Zwischen­ring aus Kupfer verlötet sind.8. Cavity according to claim 2 or 3, characterized in that the outer shell consists of niobium and the inner shell made of niobium and both are soldered to one another via an intermediate ring made of copper. 9. Cavity nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Aussenschale aus Edelstahl oder einem ähn­lichen Werkstoff und die Innenschale aus Niob besteht und beide über einen zwischengelegten Kupferring mit­einander verlötet sind.9. Cavity according to claim 2 or 3, characterized in that the outer shell made of stainless steel or a similar material and the inner shell made of niobium and both are soldered to one another via an interposed copper ring. 10. Cavity nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Aussenschale aus Kupfer und die Innenschale aus Niob besteht, die Aussenschale mit einem innen­liegenden Kupferring verschweisst ist, der Kupferring mit einem innenliegenden Niobring verlötet ist und der Niobring mit der Innenschale verschweisst ist.10. Cavity according to claim 2 or 3, characterized in that the outer shell is made of copper and the inner shell of niobium, the outer shell is welded to an inner copper ring, the copper ring is soldered to an inner niobium ring and the niobium ring is welded to the inner shell. 11. Cavity nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Aussenschale aus Edelstahl oder einem ähn­lichen Werkstoff und die Innenschale aus Niob besteht, wobei die Aussenschale mit einem innenliegenden Edel­ stahl-Ring mit einem innenliegenden Kupferring ver­schweisst ist, dieser Edelstahl-Ring mit einem innen­liegenden Kupferring verlötet ist, dieser Kupferring mit einem innenliegenden Niobring verlötet ist und dieser Niobring mit der Innenschale verschweisst ist.11. Cavity according to claim 2 or 3, characterized in that the outer shell made of stainless steel or a similar material and the inner shell made of niobium, the outer shell having an inner noble steel ring is welded to an inner copper ring, this stainless steel ring is soldered to an inner copper ring, this copper ring is soldered to an inner niobium ring and this niobium ring is welded to the inner shell. 12. Cavity nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, dass zum Durchtritt des Kühlmittels zwischen einzelnen Wellentälern Verbindungskanäle in der Aussenschale vorgesehen sind.12. Cavity according to one of the preceding claims, characterized in that connection channels are provided in the outer shell for the passage of the coolant between individual wave troughs.
EP19900101117 1989-01-20 1990-01-19 Directly cooled superconductor cavity Withdrawn EP0379224A3 (en)

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DE19893901554 DE3901554A1 (en) 1989-01-20 1989-01-20 DIRECTLY REFRIGERATED SUPERCONDUCTIVE CAVITY
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US5347242A (en) * 1991-01-24 1994-09-13 The Furukawa Electric Co., Ltd. Superconducting accelerating tube comprised of half-cells connected by ring shaped elements
CN100384305C (en) * 2005-11-11 2008-04-23 赵夔 Large crystal grain niobium material superconducting cavity and its manufacturing method
EP2571338A4 (en) * 2010-05-12 2015-05-06 Mitsubishi Heavy Ind Ltd Superconducting acceleration cavity and method of manufacturing superconducting acceleration cavity
CN108449860A (en) * 2018-03-05 2018-08-24 中国科学院高能物理研究所 A kind of low temperature inserted link tuner and superconductor cavity

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DE102009028182B3 (en) * 2009-08-03 2011-02-24 Forschungszentrum Dresden - Rossendorf E.V. High frequency-photoelectron source has semiconducting cavity resonator system that has cathode, choke cell and gun cell

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US3318376A (en) * 1966-04-13 1967-05-09 Vihl Bernhard Heat transfer fluid conduit wrapping for vessels
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CN100384305C (en) * 2005-11-11 2008-04-23 赵夔 Large crystal grain niobium material superconducting cavity and its manufacturing method
EP2571338A4 (en) * 2010-05-12 2015-05-06 Mitsubishi Heavy Ind Ltd Superconducting acceleration cavity and method of manufacturing superconducting acceleration cavity
CN108449860A (en) * 2018-03-05 2018-08-24 中国科学院高能物理研究所 A kind of low temperature inserted link tuner and superconductor cavity

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DE3901554A1 (en) 1990-08-02

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