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EP0208163B1 - 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
EP0208163B1
EP0208163B1 EP86108071A EP86108071A EP0208163B1 EP 0208163 B1 EP0208163 B1 EP 0208163B1 EP 86108071 A EP86108071 A EP 86108071A EP 86108071 A EP86108071 A EP 86108071A EP 0208163 B1 EP0208163 B1 EP 0208163B1
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EP
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Prior art keywords
dipole
windings
magnetic field
arrangement according
auxiliary winding
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EP86108071A
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German (de)
French (fr)
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EP0208163A1 (en
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Andreas Dr. Jahnke
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Siemens AG
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Siemens AG
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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 (English: “race track”).
  • race track microtrons English: “race track”
  • the particle trajectories of this type of accelerator systems are composed of two semicircles, each with a corresponding 180 ° deflection magnet, and of two straight trajectory 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 with unchanged dimensions.
  • 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 ro is the radius of the particle orbit, B z o is the component of magnetic induction running perpendicular to the particle orbit and aB / ar is the field gradient (see, for example, 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 broken through to the outside in the equatorial plane of the particle path in order to allow an outlet and thus a 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 restriction of the Magnitude of magnetic induction 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 advantages associated with this can be seen in particular in the fact that the same manufacturing processes can be used for the additional winding as for the superconducting dipole windings.
  • Appropriate methods are e.g. proposed with DE patent applications P 3 444 983.3, P 3 504 211.7 or P 3 504 223.0.
  • 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 electrical device storage ring system is indicated.
  • 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 curved in a semicircular shape (cf. e.g. the publication mentioned at the beginning). Since in particular end energies of the electrons e of several 100 MeV are aimed for, the windings 3 and 4 of the magnet are 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 advantageously overlap in this region, ie these windings then have one in this region 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)

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-Microtrons (englisch: "race-track") 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 (English: "race track"). The particle trajectories of this type of accelerator systems are composed of two semicircles, each with a corresponding 180 ° deflection magnet, and of two straight trajectory 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 approximately 100 MeV to 1 GeV, the magnetic field can be increased with unchanged dimensions. 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 ro der Radius der Teilchenbahn, Bzo die senkrecht bezüglich der Teilchenbahn verlaufende Komponente der magnetischen Induktion und aB/ar 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 ro is the radius of the particle orbit, B z o is the component of magnetic induction running perpendicular to the particle orbit and aB / ar is the field gradient (see, for example, 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 Aquatorialebene 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 broken through to the outside in the equatorial plane of the particle path in order to allow an outlet and thus a 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.Apart from the fact that the formation of a corresponding iron yoke is relatively complex in the known storage ring system, the contribution of the iron yoke to the magnetic flux density is also limited due to the magnetic saturation of the material.

Aufgabe der vorliegenden 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 restriction of the Magnitude of magnetic induction 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 insbesondere 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-Patentanmeidungen P 3 444 983.3, P 3 504 211.7 oder P 3 504 223.0 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 advantages associated with this can be seen in particular in the fact that the same manufacturing processes can be used for the additional winding as for the superconducting dipole windings. Appropriate methods are e.g. proposed with DE patent applications P 3 444 983.3, P 3 504 211.7 or P 3 504 223.0. 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 region 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 abhängigen Ansprüchen hervor.Advantageous refinements of the magnetic field device according to the invention emerge from the dependent claims.

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 electrical device storage ring system is indicated. 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 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 vorteilhaft 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 curved in a semicircular shape (cf. e.g. the publication mentioned at the beginning). Since in particular end energies of the electrons e of several 100 MeV are aimed for, the windings 3 and 4 of the magnet are 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 in 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 advantageously overlap in this region, ie these windings then have one in this region 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. Magnetic field arrangement for an apparatus for accelerating and/or storing electrically charged particles, particularly electrons, the path of which particles (5) has curved sections, in each of which a curved dipole magnet is arranged, which comprises superconducting windings (3, 4) and an auxiliary winding (7) and with which a magnetic conductive field for the particle beam is produced, this magnetic conductive field being weakly focussing because of corresponding field gradients, characterised in that a superconducting auxiliary winding (7) is associated with each at least substantially iron-free dipole magnet (2), wherein the auxiliary winding
- is curved corresponding to the curve of the dipole winding (3, 4),
- at least borders with its convex outer side (7a) on the region of the concave inner sides (3i, 4i) of the curved dipole windings (3 or 4), and
- is used to generate substantially the required field gradients.
2. Magnetic field arrangement according to claim 1, characterised in that the auxiliary winding (7) is arranged in an intermediate plane running between the parallel planes of the dipole windings (3, 4).
3. Magnetic field arrangement according to claim 1 or 2, characterised in that the convex outer side (7a) of the auxiliary winding (7) and the concave inner sides (3i, 4i) of the dipole windings (3, 4) at least partially overlap.
4. Magnetic field arrangement according to one of claims 1 to 3, characterised in that the auxiliary winding (7) and the dipole windings (3, 4) are located in a common cryostatic casing (11).
5. Magnetic field arrangement according to claim 4, characterised in that the auxiliary winding (7) and the dipole windings (3, 4) are fixed via the cryostatic casing (11) to a central tower-like holder (12).
6. Magnetic field arrangement according to claim 5, characterised in that the tower-like holder (12) is arranged on the inner side of the dipole magnet (2) outside the areas enclosed in each case by the windings (3, 4, 7).
7. Magnetic field arrangement according to one of claims 4 to 6, characterised in that the cryostatic casing (11) is formed at its outer side into a slit-like beam chamber (13) in the region of the central plane determined by the particle path (s) in order to discharge synchrotron radiation.
8. Magnetic field arrangement according to one of claims 1 to 7, characterised in that a respective dipole side winding (8 or 9) with superconducting leads is arranged in the areas enclosed by the dipole windings (3, 4).
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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DE3522528 1985-06-24
DE3522528 1985-06-24

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EP0208163B1 true EP0208163B1 (en) 1989-01-04

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Cited By (14)

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DE4000666A1 (en) * 1989-01-12 1990-07-19 Mitsubishi Electric Corp ELECTROMAGNET FOR PARTICLE ACCELERATOR
US8952634B2 (en) 2004-07-21 2015-02-10 Mevion Medical Systems, Inc. Programmable radio frequency waveform generator for a synchrocyclotron
US8907311B2 (en) 2005-11-18 2014-12-09 Mevion Medical Systems, Inc. Charged particle radiation therapy
US8344340B2 (en) 2005-11-18 2013-01-01 Mevion Medical Systems, Inc. Inner gantry
US8916843B2 (en) 2005-11-18 2014-12-23 Mevion Medical Systems, Inc. Inner gantry
US9452301B2 (en) 2005-11-18 2016-09-27 Mevion Medical Systems, Inc. Inner gantry
US7728311B2 (en) 2005-11-18 2010-06-01 Still River Systems Incorporated Charged particle radiation therapy
US8003964B2 (en) 2007-10-11 2011-08-23 Still River Systems Incorporated Applying a particle beam to a patient
US8941083B2 (en) 2007-10-11 2015-01-27 Mevion Medical Systems, Inc. Applying a particle beam to a patient
US8581523B2 (en) 2007-11-30 2013-11-12 Mevion Medical Systems, Inc. Interrupted particle source
USRE48317E1 (en) 2007-11-30 2020-11-17 Mevion Medical Systems, Inc. Interrupted particle source
US8933650B2 (en) 2007-11-30 2015-01-13 Mevion Medical Systems, Inc. Matching a resonant frequency of a resonant cavity to a frequency of an input voltage
US8970137B2 (en) 2007-11-30 2015-03-03 Mevion Medical Systems, Inc. Interrupted particle source
US9301384B2 (en) 2012-09-28 2016-03-29 Mevion Medical Systems, Inc. Adjusting energy of a particle beam
US9185789B2 (en) 2012-09-28 2015-11-10 Mevion Medical Systems, Inc. Magnetic shims to alter magnetic fields
US9155186B2 (en) 2012-09-28 2015-10-06 Mevion Medical Systems, Inc. Focusing a particle beam using magnetic field flutter
US8927950B2 (en) 2012-09-28 2015-01-06 Mevion Medical Systems, Inc. Focusing a particle beam
US9545528B2 (en) 2012-09-28 2017-01-17 Mevion Medical Systems, Inc. Controlling particle therapy
US8791656B1 (en) 2013-05-31 2014-07-29 Mevion Medical Systems, Inc. Active return system
US10258810B2 (en) 2013-09-27 2019-04-16 Mevion Medical Systems, Inc. Particle beam scanning
US9962560B2 (en) 2013-12-20 2018-05-08 Mevion Medical Systems, Inc. Collimator and energy degrader

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JPS61294800A (en) 1986-12-25
EP0208163A1 (en) 1987-01-14
DE3661672D1 (en) 1989-02-09
US4680565A (en) 1987-07-14

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