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EP0208163A1 - Magnetic-field device for an apparatus for accelerating and/or storing electrically charged particles - Google Patents

Magnetic-field device for an apparatus for accelerating and/or storing electrically charged particles Download PDF

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Publication number
EP0208163A1
EP0208163A1 EP86108071A EP86108071A EP0208163A1 EP 0208163 A1 EP0208163 A1 EP 0208163A1 EP 86108071 A EP86108071 A EP 86108071A EP 86108071 A EP86108071 A EP 86108071A EP 0208163 A1 EP0208163 A1 EP 0208163A1
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Prior art keywords
windings
dipole
field device
curved
additional winding
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German (de)
French (fr)
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EP0208163B1 (en
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Andreas Dr. Jahnke
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Siemens AG
Siemens Corp
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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
    • H05H7/04—Magnet systems, e.g. undulators, wigglers; Energisation thereof
    • 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
    • Y10S505/879—Magnet or electromagnet

Definitions

  • the invention relates to a magnetic field device for a system for accelerating and / or storing electrically charged particles, in particular electrons, whose particle path has curved sections, in each of which a correspondingly curved dipole magnet is arranged, which contains superconducting windings and an additional winding and with which a magnetic guiding field is to be generated for the particle beam, which is weakly focused due to corresponding field gradients.
  • a magnetic field device for a system for accelerating and / or storing electrically charged particles, in particular electrons, whose particle path has curved sections, in each of which a correspondingly curved dipole magnet is arranged, which contains superconducting windings and an additional winding and with which a magnetic guiding field is to be generated for the particle beam, which is weakly focused due to corresponding field gradients.
  • microtrons can achieve particle energies of up to approximately 100 MeV. These systems can in particular also be implemented as so-called race track microtrons.
  • the particle paths of this type of accelerator systems are composed of two semicircles, each with a corresponding 180 ° deflection magnet, and of two straight path sections (cf. "Nucl.Instr. And Meth.”, Vol. 177, 1980, pages 411 to 416, or Vol. 204, 1982, pages 1 to 20).
  • the magnetic field can be increased if the dimensions remain unchanged.
  • Such magnetic fields can be generated in particular with superconducting magnets.
  • the electron storage ring system which can be gathered from the publication mentioned at the outset also has dipole magnets with superconducting windings in its curved sections. It is generally assumed that the guide field generated in the area of these magnets has a weakly focusing effect for the particle beam due to corresponding field gradients.
  • a measure of such a focus is the so-called field index n, which is generally defined as: where r0 is the radius of the particle trajectory , B z0 is the component of magnetic induction running perpendicular to the particle trajectory and ⁇ B / ⁇ r is the field gradient (see e.g. R.Kollath: "Particle Accelerator", Braunschweig 1955, page 23).
  • the field index is between approximately 0.3 and 0.7 and in particular approximately 0.5.
  • Such weak focusing in the curved path sections is generally achieved in known storage ring systems by special shaping of the pole shoes of an iron yoke of the dipole magnet enclosing the particle path and, if appropriate, by special additional windings.
  • the superconducting dipole magnets also have iron yokes in the storage ring system which can be gathered from the publication mentioned at the beginning. These yokes are in the The equatorial plane of the particle path is broken outwards in order to allow an outlet and thus use of the synchrotron radiation occurring in the curved sections of the particle path.
  • the object of the present invention is therefore to improve the known magnetic field device in such a way that the field gradients required for weak focusing of the particle beam are to be formed in a relatively simple manner in the area of their curved dipole coils, and the equipment expenditure required for this is limited without any limitation of the Magnetic induction size due to the saturation magnetization of iron.
  • each at least largely iron-free dipole magnet is assigned a superconducting additional winding, which is curved accordingly, which at least adjoins the area of the concave inner sides of the curved dipole windings with its convex outside and with which the required field gradients are essentially to be produced .
  • the additional winding of each dipole magnet thus has a curved shape that corresponds to that of the dipole windings.
  • the associated advantages are in particular to be seen in the fact that the same manufacturing processes can be used for the additional winding as for the superconducting dipole windings.
  • Corresponding methods are proposed, for example, with DE patent applications P 34 44 983.3, P 35 04 211.7 or P 35 04 223.0.
  • the volume filled by a curved additional winding is relatively small, so that the energy to be stored in it is advantageously correspondingly low.
  • FIG. 1 shows a magnetic field device according to the invention as part of an electron accelerator or electron storage ring system.
  • Figure 2 shows schematically the superconducting windings of such a magnetic field device. Corresponding parts in the figures are provided with the same reference numerals.
  • FIG. 1 an oblique view of a curved dipole deflection magnet of an electron accelerator or storage ring system is shown schematically in a partially broken illustration.
  • the dipole magnet generally designated 2
  • the dipole magnet is also curved due to the curved particle path s and can in particular be semicircular (see e.g. the publication mentioned at the beginning). Since in particular end energies of the electrons e ⁇ of several 100 MeV are desired, the windings 3 and 4 of the magnet are preferably made with superconducting material because of the high field strengths required for this.
  • dipole windings 3 and 4 which are also referred to as main windings, are arranged on both sides of an electron beam tube 5 running along the particle path s and lie in parallel planes and, due to their curvature, each have a concave inner side 3i or 4i and a convex outer side 3a or 4a .
  • the additional winding 7, which is therefore also to be referred to as gradient winding, has a curved shape corresponding to the shape of the main windings 3 and 4.
  • the concave inner sides 3i and 4i of the dipole windings 3 and 4 and the convex outer side 7a of the additional winding 7 can also overlap in this area, ie these windings then have one in this area about the same radius of curvature r.
  • a correspondingly curved superconducting secondary winding 8 or 9 can be provided in each of the surfaces enclosed by the superconducting main windings 3 and 4. Since the conductors of the windings 3, 4, 7 to 9 consist of superconducting material, a common croystate or helium housing 11 is provided for these windings. The housing 11 and thus the windings located in it can be fastened to a tower-like holder 12 or other supporting device which, due to the curved shape of the additional winding 7, advantageously lies approximately at the center of the radii of curvature of the windings and thus outside of the windings 3, 4, 7 each enclosed area can be arranged.
  • a slot-like blasting chamber 13 is hereby formed, which extends between the convex outer sides 3a and 4a of the main windings up to the outer side 7a of the superconducting additional winding 7.
  • the synchronous tron radiation emerging tangentially from this blasting chamber is indicated in the figure by dashed lines 14.

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

Abstract

Die Magnetfeldeinrichtung für eine Anlage zur Beschleunigung und/oder Speicherung elektrisch geladener Teilchen, insbesondere von Elektronen, weist gekrümmte Abschnitte der Teilchenbahn auf, in denen jeweils ein entsprechend gekrümmter Dipolmagnet angeordnet ist, der supraleitende Wicklungen und eine Zusatzwicklung enthält und mit dem ein magnetisches Führungsfeld für den Teilchenstrahl zu erzeugen ist, das schwach fokussierend aufgrund entsprechender Feldgradienten wirkt. Diese Feldgradienten sollen auch bei hoher magnetischer Flußdichte auf verhältnismäßig einfache Weise hervorzurufen sein. Erfindungsgemäß ist hierzu vorgesehen, daß jedem zumindest eisenfreien Dipolmagneten (2) eine supraleitende Zusatzwicklung (7) zugeordnet ist, welche entsprechend gekrümmt ist, mit ihrer konvexen Außenseite (7a) an den Bereich der konkaven Innenseiten (3i, 4i) der gekrümmten Dipolwicklungen (3 bzw. 4) zumindest angrenzt und mit welcher die erforderlichen Feldgradienten im wesentlichen hervorzurufen sind.The magnetic field device for a system for accelerating and / or storing electrically charged particles, in particular electrons, has curved sections of the particle path, in each of which a correspondingly curved dipole magnet is arranged, which contains superconducting windings and an additional winding and with which a magnetic guide field for the particle beam is to be generated, which has a weak focus due to corresponding field gradients. These field gradients are said to be able to be produced in a relatively simple manner even with a high magnetic flux density. According to the invention, each at least iron-free dipole magnet (2) is assigned a superconducting additional winding (7), which is curved accordingly, with its convex outer side (7a) at the area of the concave inner sides (3i, 4i) of the curved dipole windings (3 or 4) at least adjacent and with which the required field gradients are to be produced essentially.

Description

Die Erfindung bezieht sich auf eine Magnetfeldeinrich­tung für eine Anlage zur Beschleunigung und/oder Spei­cherung elektrisch geladener Teilchen, insbesondere von Elektronen, deren Teilchenbahn gekrümmte Abschnitte aufweist, in denen jeweils ein entsprechend gekrümmter Dipolmagnet angeordnet ist, der supraleitende Wick­lungen und eine Zusatzwicklung enthält und mit dem ein magnetisches Führungsfeld für den Teilchenstrahl zu erzeugen ist, das schwach fokussierend aufgrund ent­sprechender Feldgradienten ist. Eine derartige Ein­richtung ist z.B. aus der Veröffentlichung mit dem Titel "Superconducting Racetrack Electron Storage Ring and Coexistent Injector Microtron for Synchrotron Radiation" des "Institute for Solid State Physics" of the University of Tokyo, Japan, Sept. 1984, Ser. B, No. 21, Seiten 1 bis 29 zu entnehmen.The invention relates to a magnetic field device for a system for accelerating and / or storing electrically charged particles, in particular electrons, whose particle path has curved sections, in each of which a correspondingly curved dipole magnet is arranged, which contains superconducting windings and an additional winding and with which a magnetic guiding field is to be generated for the particle beam, which is weakly focused due to corresponding field gradients. Such a device is e.g. from the publication entitled "Superconducting Racetrack Electron Storage Ring and Coexistent Injector Microtron for Synchrotron Radiation" by the "Institute for Solid State Physics" of the University of Tokyo, Japan, Sept. 1984, Ser. B, No. 21, pages 1 to 29.

Mit bekannten kleineren, kreisförmig gestalteten Elek­tronenbeschleuniger-Anlagen, die auch als "Microtrons" bezeichnet werden, lassen sich Teilchenenergien bis etwa 100 MeV erreichen. Diese Anlagen können insbeson­dere auch als sogenannte Rennbahn-(englisch: "race-­track")Microtrons realisiert werden. Die Teilchenbahnen dieses Typs von Beschleuniger-Anlagen setzen sich dabei aus zwei Halbkreisen mit jeweils einem entsprechenden 180°-Ablenkmagneten und aus zwei geraden Bahnabschnitten zusammen (vgl. "Nucl.Instr. and Meth.", Vol. 177, 1980, Seiten 411 bis 416, oder Vol. 204, 1982, Seiten 1 bis 20).Known smaller, circularly shaped electron accelerator systems, which are also referred to as "microtrons", can achieve particle energies of up to approximately 100 MeV. These systems can in particular also be implemented as so-called race track microtrons. The particle paths of this type of accelerator systems are composed of two semicircles, each with a corresponding 180 ° deflection magnet, and of two straight path sections (cf. "Nucl.Instr. And Meth.", Vol. 177, 1980, pages 411 to 416, or Vol. 204, 1982, pages 1 to 20).

Soll die angestrebte Endenergie der Elektronen von etwa 100 MeV bis 1 GeV gesteigert werden, so bietet sich bei unveränderten Abmessungen die Erhöhung des Magnetfeldes an. Derartige Magnetfelder können insbesondere mit supraleitenden Magneten erzeugt werden.If the target final energy of the electrons is to be increased from about 100 MeV to 1 GeV, the magnetic field can be increased if the dimensions remain unchanged. Such magnetic fields can be generated in particular with superconducting magnets.

Auch die aus der eingangs genannten Veröffentlichung zu entnehmende Elektronenspeicherring-Anlage weist in ihren gekrümmten Abschnitten Dipolmagnete mit supralei­tenden Wicklungen auf. Dabei wird im allgemeinen vor­ausgesetzt, daß das im Bereich dieser Magnete erzeugte Führungsfeld für den Teilchenstrahl schwach fokussierend aufgrund entsprechender Feldgradienten wirkt. Ein Maß für eine derartige Fokussierung ist der sogenannte Feldindex n, der allgemein definiert ist als:

Figure imgb0001
wobei r₀ der Radius der Teilchenbahn, Bz0 die senkrecht bezüglich der Teilchenbahn verlaufende Komponente der magnetischen Induktion und ∂B/∂r der Feldgradient sind (vgl. z.B. R.Kollath: "Teilchenbeschleuniger", Braunschweig 1955, Seite 23). Im Falle einer schwachen Fokussierung liegt der Feldindex zwischen etwa 0,3 und 0,7 und insbesondere bei etwa 0,5.The electron storage ring system which can be gathered from the publication mentioned at the outset also has dipole magnets with superconducting windings in its curved sections. It is generally assumed that the guide field generated in the area of these magnets has a weakly focusing effect for the particle beam due to corresponding field gradients. A measure of such a focus is the so-called field index n, which is generally defined as:
Figure imgb0001
 where r₀ is the radius of the particle trajectory , B z0 is the component of magnetic induction running perpendicular to the particle trajectory and ∂B / ∂r is the field gradient (see e.g. R.Kollath: "Particle Accelerator", Braunschweig 1955, page 23). In the case of poor focusing, the field index is between approximately 0.3 and 0.7 and in particular approximately 0.5.

Eine solche schwache Fokussierung in den gekrümmten Bahnabschnitten wird im allgemeinen bei bekannten Speicherring-Anlagen durch besondere Formgebungen der Polschuhe eines die Teilchenbahn umschließenden Eisen­joches des Dipolmagneten sowie gegebenenfalls durch besondere Zusatzwicklungen erreicht. Auch bei der aus der eingangs genannten Veröffentlichung zu entnehmenden Speicherring-Anlage weisen die supraleitenden Dipol­magnete Eisenjoche auf. Diese Joche sind in der Äquatorialebene der Teilchenbahn nach außen hin durch­brochen, um einen Auslaß und damit eine Nutzung der in den gekrümmten Abschnitten der Teilchenbahn auftreten­den Synchrotronstrahlung zu ermöglichen.Such weak focusing in the curved path sections is generally achieved in known storage ring systems by special shaping of the pole shoes of an iron yoke of the dipole magnet enclosing the particle path and, if appropriate, by special additional windings. The superconducting dipole magnets also have iron yokes in the storage ring system which can be gathered from the publication mentioned at the beginning. These yokes are in the The equatorial plane of the particle path is broken outwards in order to allow an outlet and thus use of the synchrotron radiation occurring in the curved sections of the particle path.

Abgesehen davon, daß bei der bekannten Speicherring-­Anlage die Ausbildung eines entsprechenden Eisenjoches verhältnismäßig aufwendig ist, ist auch der Beitrag des Eisenjochs zur magnetischen Flußdichte aufgrund der magnetischen Sättigung des Materials nach oben hin begrenzt.In addition to the fact that the formation of a corresponding iron yoke in the known storage ring system is relatively complex, the contribution of the iron yoke to the magnetic flux density is also limited due to the magnetic saturation of the material.

Aufgabe der vorleigenden Erfindung ist es deshalb, die bekannte Magnetfeldeinrichtung dahingehend zu ver­bessern, daß auf verhältnismäßig einfache Weise im Be­reich ihrer gekrümmten Dipolspulen die für eine schwache Fokussierung des Teilchenstrahles erforder­lichen Feldgradienten auszubilden sind und der hierfür erforderliche apparative Aufwand begrenzt ist, ohne daß eine Beschränkung der Größe der magnetischen Induktion aufgrund der Sättigungsmagnetisierung von Eisen be­steht.The object of the present invention is therefore to improve the known magnetic field device in such a way that the field gradients required for weak focusing of the particle beam are to be formed in a relatively simple manner in the area of their curved dipole coils, and the equipment expenditure required for this is limited without any limitation of the Magnetic induction size due to the saturation magnetization of iron.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß jedem zumindest weitgehend eisenfreien Dipolmagneten eine supraleitende Zusatzwicklung zugeordnet ist, welche entsprechend gekrümmt ist, welche mit ihrer konvexen Außenseite an den Bereich der konkaven Innen­seiten der gekrümmten Dipolwicklungen zumindest an­grenzt und mit welcher die erforderlichen Feldgradien­ten im wesentlichen hervorzurufen sind.This object is achieved in that each at least largely iron-free dipole magnet is assigned a superconducting additional winding, which is curved accordingly, which at least adjoins the area of the concave inner sides of the curved dipole windings with its convex outside and with which the required field gradients are essentially to be produced .

Die Zusatzwicklung jedes Dipolmagneten weist somit eine gekrümmte Form auf, die der der Dipolwicklungen ent­spricht. Die damit verbundenen Vorteile sind insbeson­ dere darin zu sehen, daß für die Zusatzwicklung die­selben Verfahren zur Herstellung angewandt werden können wie für die supraleitenden Dipolwicklungen. Entsprechende Verfahren sind z.B. mit den DE-Patent­anmeldungen P 34 44 983.3, P 35 04 211.7 oder P 35 04 223.0 vorgeschlagen. Außerdem ist das von einer gekrümmten Zusatzwicklung eingenommene magnetfelder­füllte Volumen verhältnismäßig klein, so daß die in ihr zu speichernde Energie vorteilhaft entsprechend gering ist. Darüber hinaus bleibt im Inneren der gekrümmten Zusatzspule im Bereich ihres Radiusmittelpunktes hin­reichend Platz, um mechanische Stützstrukturen für die Dipolwicklungen und die Zusatzwicklung anordnen zu können.The additional winding of each dipole magnet thus has a curved shape that corresponds to that of the dipole windings. The associated advantages are in particular to be seen in the fact that the same manufacturing processes can be used for the additional winding as for the superconducting dipole windings. Corresponding methods are proposed, for example, with DE patent applications P 34 44 983.3, P 35 04 211.7 or P 35 04 223.0. In addition, the volume filled by a curved additional winding is relatively small, so that the energy to be stored in it is advantageously correspondingly low. In addition, there is sufficient space in the interior of the curved auxiliary coil in the area of its center of radius in order to be able to arrange mechanical support structures for the dipole windings and the additional winding.

Vorteilhafte Ausgestaltungen der erfindungsgemäßen Magnetfeldeinrichtung gehen aus den Unteransprüchen hervor.Advantageous refinements of the magnetic field device according to the invention emerge from the subclaims.

Zur weiteren Erläuterung der Erfindung wird auf die Zeichnung Bezug genommen, in deren Figur 1 eine er­findungsgemäße Magnetfeldeinrichtung als Teil einer Elektronenbeschleuniger- bzw. Elektronenspeicher­ring-Anlage angedeutet ist. Figur 2 zeigt schematisch die supraleitenden Wicklungen einer derartigen Magnet­feldeinrichtung. Dabei sind in den Figuren überein­stimmende Teile mit den gleichen Bezugszeichen ver­sehen.To further explain the invention, reference is made to the drawing, in which FIG. 1 shows a magnetic field device according to the invention as part of an electron accelerator or electron storage ring system. Figure 2 shows schematically the superconducting windings of such a magnetic field device. Corresponding parts in the figures are provided with the same reference numerals.

In Figur 1 ist in Schrägansicht ein gekrümmter Dipol­ablenkmagnet einer Elektronenbeschleuniger- bzw. -spei­cherringanlage in teilweise aufgerissener Darstellung schematisch wiedergegeben. Der allgemein mit 2 be­zeichnete Dipolmagnet ist aufgrund der gekrümmten Teil­chenbahn s ebenfalls gekrümmt und kann insbesondere halbkreisförmig gebogen sein (vgl. z.B. die eingangs genannte Veröffentlichung). Da insbesondere End­energien der Elektronen e⁻ von mehreren 100 MeV an­gestrebt werden, sind wegen der hierfür erforder­lichen hohen Feldstärken die Wicklungen 3 und 4 des Magneten bevorzugt mit supraleitendem Material er­stellt. Diese Dipolwicklungen 3 und 4, die auch als Hauptwicklungen bezeichnet werden, sind beiderseits eines längs der Teilchenbahn s verlaufenden Elek­tronenstrahlrohres 5 in parallelen Ebenen liegend angeordnet und weisen aufgrund ihrer Krümmung jeweils eine konkave Innenseite 3i bzw. 4i und eine konvexe Außenseite 3a bzw. 4a auf. In der durch das Strahl­rohr 5 bzw. die Teilchenbahn s aufgespannten Äqua­torialebene liegt außerdem gemäß der Erfindung eine supraleitende Zusatzwicklung 7, mit der die für eine schwache Fokussierung mit Feldindex n zwischen etwa 0,3 und 0,7, insbesondere von etwa 0,5 erforderlichen Feld­gradienten des von den Hauptwicklungen 3 und 4 er­zeugten Dipolfeldes zumindest im wesentlichen hervor­zurufen sind. Die deshalb auch als Gradientenwicklung zu bezeichnende Zusatzwicklung 7 weist dabei eine der Form der Hauptwicklungen 3 und 4 entsprechende ge­krümmte Form auf. Dabei grenzt diese Zusatzwicklung 7 mit ihrer Außenseite 7a an den durch die Innenseiten 3i und 4i der Hauptwicklungen 3 und 4 festgelegten Bereich zumindest an. Wie insbesondere aus der schematischen Aufsicht der Figur 2 näher hervorgeht, können sich in diesem Bereich vorteilhat die konkaven Innenseiten 3i und 4i der Dipolwicklungen 3 und 4 und die konvexe Außenseite 7a der Zusatzwicklung 7 auch überlappen, d.h., diese Wicklungen haben dann in diesem Bereich einen etwa gleichen Krümmungsradius r.In FIG. 1, an oblique view of a curved dipole deflection magnet of an electron accelerator or storage ring system is shown schematically in a partially broken illustration. The dipole magnet, generally designated 2, is also curved due to the curved particle path s and can in particular be semicircular (see e.g. the publication mentioned at the beginning). Since in particular end energies of the electrons e⁻ of several 100 MeV are desired, the windings 3 and 4 of the magnet are preferably made with superconducting material because of the high field strengths required for this. These dipole windings 3 and 4, which are also referred to as main windings, are arranged on both sides of an electron beam tube 5 running along the particle path s and lie in parallel planes and, due to their curvature, each have a concave inner side 3i or 4i and a convex outer side 3a or 4a . In the equatorial plane spanned by the beam pipe 5 or the particle path s, according to the invention, there is also a superconducting additional winding 7, with which the winding required for weak focusing with field index n is between approximately 0.3 and 0.7, in particular approximately 0.5 Field gradients of the dipole field generated by the main windings 3 and 4 are to be produced at least essentially. The additional winding 7, which is therefore also to be referred to as gradient winding, has a curved shape corresponding to the shape of the main windings 3 and 4. This additional winding 7, with its outer side 7a, at least adjoins the area defined by the inner sides 3i and 4i of the main windings 3 and 4. As can be seen in particular from the schematic top view of FIG. 2, the concave inner sides 3i and 4i of the dipole windings 3 and 4 and the convex outer side 7a of the additional winding 7 can also overlap in this area, ie these windings then have one in this area about the same radius of curvature r.

Ferner ist in Figur 1 angedeutet, daß in den von den supraleitenden Hauptwicklungen 3 und 4 jeweils um­schlossenen Flächen noch je eine entsprechend gekrümmte supraleitende Nebenwicklung 8 bzw. 9 vorgesehen werden kann. Da die Leiter der Wicklungen 3, 4, 7 bis 9 aus supraleitendem Material bestehen, ist für diese Wick­lungen ein gemeinsames Kroystaten- oder Heliumgehäuse 11 vorgesehen. Das Gehäuse 11 und damit die in ihm befindlichen Wicklungen können an einer turmartigen Halterung 12 oder sonstigen Stützvorrichtung befestigt sein, die vorteilhaft aufgrund der gekrümmten Form der Zusatzwicklung 7 etwa im Mittelpunkt der Krümmungs­radien der Wicklungen und somit außerhalb der von den Wicklungen 3, 4, 7 jeweils eingeschlossenen Flächen angeordnet werden kann. Hiermit können gegebenenfalls auch Probleme mit Wirbelströmen in der Halterung 12 wesentlich vermindert werden. Außerdem ist das Gehäuse 11 im Bereich der Äquatorialebene von der Außenseite des Dipolmagneten 2 her aus Gründen einer ungestörten Herausführung der in dem gekrümmten Bereich der Teil­chenbahn s auftretenden Synchrotronstrahlung nicht durchgehend, sondern quasi zweigeteilt ausgeführt. Hiermit ist eine schlitzartige Strahlkammer 13 ausge­bildet, die zwischen den konvexen Außenseiten 3a und 4a der Hauptwicklungen hindurch bis an die Außenseite 7a der supraleitenden Zusatzwicklung 7 heranreicht. Die aus dieser Strahlkammer tangential austretende Synchron­tronstrahlung ist in der Figur durch gestrichelte Linien 14 angedeutet.Furthermore, it is indicated in FIG. 1 that a correspondingly curved superconducting secondary winding 8 or 9 can be provided in each of the surfaces enclosed by the superconducting main windings 3 and 4. Since the conductors of the windings 3, 4, 7 to 9 consist of superconducting material, a common croystate or helium housing 11 is provided for these windings. The housing 11 and thus the windings located in it can be fastened to a tower-like holder 12 or other supporting device which, due to the curved shape of the additional winding 7, advantageously lies approximately at the center of the radii of curvature of the windings and thus outside of the windings 3, 4, 7 each enclosed area can be arranged. In this way, problems with eddy currents in the holder 12 can also be substantially reduced. In addition, in the area of the equatorial plane from the outside of the dipole magnet 2, for reasons of undisturbed removal of the synchrotron radiation occurring in the curved area of the particle path s, the housing 11 is not made continuously, but rather in two parts. A slot-like blasting chamber 13 is hereby formed, which extends between the convex outer sides 3a and 4a of the main windings up to the outer side 7a of the superconducting additional winding 7. The synchronous tron radiation emerging tangentially from this blasting chamber is indicated in the figure by dashed lines 14.

Claims (8)

1. Magnetfeldeinrichtung für eine Anlage zur Beschleuni­gung und/oder Speicherung elektrisch geladener Teil­chen, insbesondere von Elektronen, deren Teilchenbahn gekrümmte Abschnitte aufweist, in denen jeweils ein entsprechend gekrümmter Dipolmagnet angeordnet ist, der supraleitende Wicklungen und eine Zusatzwicklung ent­hält und mit dem ein magnetisches Führungsfeld für den Teilchenstrahl zu erzeugen ist, das schwach fokussierend aufgrund entsprechender Feldgradienten ist, dadurch gekennzeichnet, daß jedem zumindest weitgehend eisenfreien Dipolmagneten (2) eine supraleitende Zusatzwicklung (7) zugeordnet ist, welche
- entsprechend gekrümmt ist,
- mit ihrer konvexen Außenseite (7a) an den Bereich der konkaven Innenseiten (3i, 4i) der gekrümmten Dipol­wicklungen (3 bzw. 4) zumindest angrenzt
und
- mit welcher die erforderlichen Feldgradienten im wesentlichen hervorzurufen sind.1. Magnetic field device for a system for accelerating and / or storing electrically charged particles, in particular electrons, whose particle path has curved sections, in each of which a correspondingly curved dipole magnet is arranged, which contains superconducting windings and an additional winding and with which a magnetic guide field for the particle beam is to be generated, which is weakly focusing due to corresponding field gradients, characterized in that each at least largely iron-free dipole magnet (2) is assigned a superconducting additional winding (7) which
- is curved accordingly,
- With its convex outer side (7a) at least adjacent to the area of the concave inner sides (3i, 4i) of the curved dipole windings (3 and 4)
and
- With which the required field gradients are essentially to be created. 2. Magnetfeldeinrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Zu­satzwicklung (7) in einer zwischen den parallelen Ebenen der Dipolwicklungen (3, 4) verlaufenden Zwi­schenebene angeordnet ist.2. Magnetic field device according to claim 1, characterized in that the additional winding (7) is arranged in an intermediate plane extending between the parallel planes of the dipole windings (3, 4). 3. Magnetfeldeinrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß sich die konvexe Außenseite (7a) der Zusatzwicklung (7) sowie die konkaven Innenseiten (3i, 4i) der Dipolwick­lungen (3, 4) zumindest teilweise überlappen.3. Magnetic field device according to claim 1 or 2, characterized in that the convex outside (7a) of the additional winding (7) and the concave inner sides (3i, 4i) of the dipole windings (3, 4) overlap at least partially. 4. Mgnetfeldeinrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß sich die Zusatzwicklung (7) und die Dipolwicklungen (3, 4) in einem gemeinsamen Kryostatengehäuse (11) be­finden.4. Mgnetfeldeinrichtung according to any one of claims 1 to 3, characterized in that the additional winding (7) and the dipole windings (3, 4) are in a common cryostat housing (11). 5. Magnetfeldeinrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die Zu­satzwicklung (7) und die Dipolwicklungen (3, 4) über das Kryostatengehäuse (11) an einer zentralen turm­artigen Halterung (12) befestigt sind.5. Magnetic field device according to claim 4, characterized in that the additional winding (7) and the dipole windings (3, 4) via the cryostat housing (11) are attached to a central tower-like holder (12). 6. Magnetfeldeinrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die turmartige Hal­terung (12) an der Innenseite des Dipolmagneten (2) außerhalb der von den Wicklungen (3, 4, 7) jeweils be­grenzten Flächen angeordnet ist.6. Magnetic field device according to claim 5, characterized in that the tower-like holder (12) on the inside of the dipole magnet (2) is arranged outside of the areas delimited by the windings (3, 4, 7). 7. Magnetfeldeinrichtung nach einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, daß zum Auslaß von Synchrontronstrahlung das Kryostatengehäuse (11) im Bereich der durch die Teilchenbahn (s) festgelegten Mittelebene an seiner Außenseite zu einer schlitzartigen Strahlkammer (13) ausgebildet ist.7. Magnetic field device according to one of claims 4 to 6, characterized in that for the discharge of synchronous tron radiation, the cryostat housing (11) in the region of the central plane defined by the particle path (s) is formed on its outside to form a slit-like radiation chamber (13). 8. Magnetfeldeinrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß in den von den Dipolwicklungen (3, 4) eingeschlossenen Flächen jeweils eine Dipolnebenwicklung (8 bzw. 9) mit supraleitenden Leitern angeordnet ist.8. Magnetic field device according to one of claims 1 to 7, characterized in that in each of the surfaces enclosed by the dipole windings (3, 4) a dipole secondary winding (8 or 9) with superconducting conductors is arranged.
EP86108071A 1985-06-24 1986-06-12 Magnetic-field device for an apparatus for accelerating and/or storing electrically charged particles Expired EP0208163B1 (en)

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US4680565A (en) 1987-07-14
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DE3661672D1 (en) 1989-02-09

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