EP2340692A1 - Undulator for producing synchrotron radiation - Google Patents

Undulator for producing synchrotron radiation

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Publication number
EP2340692A1
EP2340692A1 EP09748993A EP09748993A EP2340692A1 EP 2340692 A1 EP2340692 A1 EP 2340692A1 EP 09748993 A EP09748993 A EP 09748993A EP 09748993 A EP09748993 A EP 09748993A EP 2340692 A1 EP2340692 A1 EP 2340692A1
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EP
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Prior art keywords
undulator
layers
winding body
magnetic material
poles
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Granted
Application number
EP09748993A
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German (de)
French (fr)
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EP2340692B1 (en
Inventor
Axel Bernhard
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Karlsruher Institut fuer Technologie KIT
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Karlsruher Institut fuer Technologie KIT
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Classifications

    • 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
    • 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
    • H05H13/00—Magnetic resonance accelerators; Cyclotrons
    • H05H13/04—Synchrotrons

Definitions

  • the invention relates to undulators, which serve as a source of electro-magnetic radiation ⁇ consisting of a particle stream (z. B. electrons), which passes through the undulator is generated.
  • Undulators are used in particular for the generation of X-rays in synchrotron radiation sources.
  • DE 38 13 460 A1 discloses an undulator for generating synchrotron radiation from a particle flow introduced therein, which has two partial undulators between which the particle flow is introduced, wherein a body has recesses into which a plurality of magnetic poles of the undulator are introduced wherein the body is alternately constructed of a plurality of first layers and second layers arranged parallel to each other, the first layers each having a non-magnetic material and the second layers each having a soft magnetic material serving as a pole of the undulator.
  • correction coils must be arranged in the undulator gap between the two partial undulators and thus entail either an enlargement of the undulator gap and therefore a reduction in the achievable field amplitude or the space available for the electron beam and therefore at Operation in a storage ring reduce the life of the electron beam.
  • the local correction coils should be laterally, i. are arranged perpendicular to the main direction (longitudinal axis) of the bobbin.
  • the field of correction coils arranged in this way magnetizes the largely unsaturated winding body and in this way distributes itself over the entire length of the undulator. Therefore, despite their designation, local correction coils are not suitable for effective local field error correction.
  • an undulator which does not have the aforementioned disadvantages and limitations.
  • an undulator should be provided. the one that enables effective local field error correction by laterally mounted correction coils.
  • the idea underlying the invention is to control the magnetic flux in the longitudinal direction, i. along the main direction of the bobbin, to interrupt. In this way it becomes possible to produce a very well located correction field by lateral correction coils attached to the relevant poles of the undulator.
  • the winding body is alternately composed of magnetic and non-magnetic layers (layers, disks), which are not parallel to the beam axis, respectively.
  • the lamination is realized by a structure of the winding body of alternately arranged soft magnetic Polblechen and non-magnetic sheets, which serve as a winding base for the coil packs and interrupt the magnetic flux in the longitudinal direction.
  • the correction coils are each mounted laterally relative to the longitudinal axis of the winding body at the locations required for this purpose.
  • a device thus consists of two partial undulators, between which the particle flow, the z. B. consists of electrons, is introduced.
  • each partial undulator has a winding body which is designed such that it is suitable for receiving a coil package and a plurality, preferably from 20 to 500, particularly preferably from 50 to 200, of magnetic poles of the undulator.
  • the winding body consists of alternating -A- a variety, preferably from 20 to 500, more preferably from
  • first layers and second layers arranged to be parallel to each other but not parallel to the direction of particle flow.
  • the first layers and the second layers of each winding body parallel thereto assume an angle of 15 ° to 165 °, preferably of 60 ° to 120 °, particularly preferably approximately 90 ° with respect to the particle flow.
  • the said angle amounts to Anna while 90 ° is in the vorlie ⁇ constricting invention is a further development of a conventional superconducting undulator, otherwise a further development of a heiischen superconducting undulator according to DE 103 58 225 B3.
  • the first layers are each at least partially made of a non-magnetic material, which is geometrically configured and arranged so that the preferably superconducting coil package is guided over it.
  • the material used is preferably non-magnetic sheets, in particular made of copper or a glass fiber reinforced plastic.
  • the second layers each consist at least partially of a soft magnetic material, which serve as poles of the undulator.
  • Soft magnetic pole plates in particular made of iron or an iron cobalt alloy, are preferably used as the material.
  • the first layers and the second layers are each of the same thickness, wherein the ratio of the thickness of the first layers to the thickness of the second layers is from 1: 1 to 3: 1.
  • At least one correction coil is laterally attached to one of the second layers or introduced into a recess in the winding body in one of the second layers with respect to the axis of the winding body.
  • the particular structure of the undulator according to the invention enables the generation of a well-localized correction field by lateral correction coils.
  • the invention has in particular the advantages mentioned below.
  • the undulator of the present invention enables effective local field error correction by attaching lateral correction coils to selected second layers.
  • the heat transport through the bobbin and thus the overall cooling of the coils can be improved.
  • FIG. 1 Schematic representation of the structure of a superconducting undulator according to the invention
  • FIG. 2 Schematic representation of the structure of a superconducting undulator according to the invention, rotated by 30 ° with respect to Figure 1, with introduced correction coil.
  • the undulator 10 consists of two partial undulators 11, 12, between which the particle flow 1 is made of electrons.
  • Each sub-undulator 11, 12 has a winding body, which alternately from a parallel to each other mounted plurality of first layers 21, 21 ', 21'', ... and second layers 22, 22', 22 ", ... consists ,
  • the first and second layers are arranged in this example so that they are each perpendicular to the direction of the particle stream 1.
  • the first layers 21, 21 ', 21'', ... are each made of copper sheets as a non-magnetic material over which the superconducting coil package is guided.
  • the second layers 22, 22 ', 22'', ... each consist of iron sheets as a soft magnetic material and serve here as the poles of the undulator.
  • Fig. 2 the structure of a superconducting undulator 10 according to the invention, which is rotated by approximately 30 ° with respect to the undulator of FIG. 1 and in addition the correction coils 31, 31 ', shown schematically.
  • the correction coils 31, 31 ' are in this case wound in each sub-undulator 11, 12 each laterally with respect to the axis of the winding body to one of the second layers.
  • FIG. 3 a shows the calculated course of the magnetic field on the beam axis when using lateral correction coils in an undulator according to the prior art.
  • the continuous unmagnetized bobbin was completely magnetized by the correction coils. It can be seen that the use of laterally mounted correction coils does not allow local correction of the 'local magnetic field in a conventional undulator.
  • Fig. 3b shows the calculated course of the magnetic field on the beam axis when using a laminated undulator according to the invention. It follows that now the use of laterally mounted correction coils allows a well-defined local correction of the local magnetic field in an undulator according to the invention.

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

Abstract

The invention relates to an undulator (10) for producing synchrotron radiation from a particle stream (1) introduced into the undulator, said stream particularly comprising electrons. The undulator (10) comprises two partial undulators (11, 12), each having a winding body for receiving a coil package and a plurality of magnetic poles of the undulator. The winding body alternately comprises a plurality of first layers (21, 21', 21'', …), each having a non-magnetic material over which the coil package is guided, and second layers (22, 22', 22'', …), each having a soft magnetic material, serving as poles of the undulator, said layers being attached parallel to one another. The undulator according to the invention furthermore comprises lateral correction coils (31, 31', …) that are attached to selected second layers and enable effective local field error correction.

Description

Undulator zur Erzeugung von Synchrotronstrahlung Undulator for generating synchrotron radiation
Die Erfindung betrifft Undulatoren, die als Quelle für elektro¬ magnetische Strahlung dienen, die aus einem Teilchenstrom (z. B. Elektronen) , der den Undulator durchläuft, erzeugt wird. Undulatoren werden insbesondere für die Erzeugung von Röntgenstrahlen in Synchrotronstrahlungsquellen eingesetzt .The invention relates to undulators, which serve as a source of electro-magnetic radiation ¬ consisting of a particle stream (z. B. electrons), which passes through the undulator is generated. Undulators are used in particular for the generation of X-rays in synchrotron radiation sources.
Herkömmliche supraleitende Undulatoren bestehen aus zwei Teil- Undulatoren, die aus einem weichmagnetischen Wickelkörper und darauf gewickelten supraleitenden Spulenpaketen aufgebaut sind (siehe Robert Rossmanith und H. O. Moser, Design study of a superconductive in- vacuo undulator for storage rings with an electrical tunability bet- ween k = 0 and 2, Proceedings of the European Particle Accelerator Conference EPAC, S. 2340-2342, 2000). Hierbei sind die Spulenpakete in parallele Nuten im Wickelkörper gewickelt, während die zwischen den Nuten liegenden Stege als magnetische Pole des Undulators dienen. Für den Wickelkörper wird ein weichmagnetisches Material eingesetzt, um das Magnetfeld auf der Strahlachse durch die Magnetisierung der Pole zu verstärken.Conventional superconducting undulators consist of two sub-undulators constructed of a soft-magnetic wound body and superconducting coil packages wound thereon (see Robert Rossmanith and HO Moser, Design study of a superconductive in- vacuo undulator for storage rings with an electrical tunability between k = 0 and 2, Proceedings of the European Particle Accelerator Conference EPAC, pp. 2340-2342, 2000). In this case, the coil packages are wound in parallel slots in the winding body, while the webs lying between the slots serve as magnetic poles of the undulator. For the winding body, a soft magnetic material is used to amplify the magnetic field on the beam axis by the magnetization of the poles.
Nach H. Onuki and P. Elleaume, Hrsg., Undulators, Wigglers and their Applications, Taylor & Francis, S. 183-190, 2003, ist für die Funktion des Undulators eine hohe Feldqualität von entscheidender Bedeutung. Diese lässt sich insbesondere als möglichst gut erfüllte Perio- dizität des Feldes beschreiben.According to H. Onuki and P. Elleaume, Eds., Undulators, Wigglers and their Applications, Taylor & Francis, pp. 183-190, 2003, a high field quality is crucial to the operation of the undulator. This can be described in particular as the best possible periodicity of the field.
Durch die begrenzte erreichbare mechanische Genauigkeit ergeben sich in der Praxis lokale Abweichungen in Feldamplitude und -periode. Diese lassen sich wie in S. Chouhan, R. Rossmanith, S. Strohmer, D. Dölling, A. Geisler, A. Hobl, und S. Kubsky, Field error compensation and thermal beam load in a superconductive undulator, Proceedings of the 2003 Particle Accelerator Conference, S. 899-901, 2003, und S. Prestemon, D. R. Dietderich, S. A. Gourlay, P. Heimann, S. Marks, G. L. Sabbi, R. M. Scanlan, und R. Schlueter, Design and evaluation of a short period N3Sn superconducting undulator prototype, Proceedings of the 2003 Particle Accelerator Conference, S. 1032-1034, 2003, durch lokale Korrekturspulen kompensieren, was üblicherweise auch als Shim- ming bezeichnet wird.The limited achievable mechanical accuracy results in practice local deviations in field amplitude and period. These can be obtained as described in S. Chouhan, R. Rossmanith, S. Strohmer, D. Dölling, A. Geisler, A. Hobl, and S. Kubsky, Field error compensation and thermal beam load in a superconductive undulator, Proceedings of the 2003 Particle Accelerator Conference, pp. 899-901, 2003, and S. Prestemon, DR Dieterich, SA Gourlay, P. Heimann, S. Marks, GL Sabbi, RM Scanlan, and R. Schlueter, Design and evaluation of a short period N 3 Sn superconducting undulator prototype, Proceedings of the 2003 Particle Accelerator Conference, pp. 1032-1034, 2003, by local correction coils, which is commonly referred to as shimming.
Die DE 38 13 460 Al offenbart einen Undulator zur Erzeugung von Synchrotronstrahlung aus einem in diesen eingebrachten Teilchenstrom, der zwei Teil-Undulatoren aufweist, zwischen denen der Teilchenstrom eingebracht ist, wobei ein Körper Ausnehmungen aufweist, in die eine Vielzahl von magnetischen Polen des Undulators eingebracht sind, wobei der Körper abwechselnd aus einer parallel zueinander angebrachten Vielzahl von ersten Lagen und von zweiten Lagen aufgebaut ist, wobei die ersten Lagen jeweils ein nicht-magnetisches Material und die zweiten Lagen jeweils ein weichmagnetisches Material, die als Pole des Undulators dienen, aufweisen.DE 38 13 460 A1 discloses an undulator for generating synchrotron radiation from a particle flow introduced therein, which has two partial undulators between which the particle flow is introduced, wherein a body has recesses into which a plurality of magnetic poles of the undulator are introduced wherein the body is alternately constructed of a plurality of first layers and second layers arranged parallel to each other, the first layers each having a non-magnetic material and the second layers each having a soft magnetic material serving as a pole of the undulator.
Nachteil dieser Anordnungen ist, dass die Korrekturspulen im Undula- torspalt zwischen den beiden Teil-Undulatoren angeordnet werden müssen und damit entweder eine Vergrößerung des Undulatorspaltes und daher eine Verringerung der erreichbaren Feldamplitude nach sich ziehen oder den für den Elektronenstrahl zur Verfügung stehenden Platz und daher beim Betrieb in einem Speicherring die Lebensdauer des Elektronenstrahls verringern.A disadvantage of these arrangements is that the correction coils must be arranged in the undulator gap between the two partial undulators and thus entail either an enlargement of the undulator gap and therefore a reduction in the achievable field amplitude or the space available for the electron beam and therefore at Operation in a storage ring reduce the life of the electron beam.
Um diese Nachteile zu vermeiden, sollten die lokalen Korrekturspulen lateral, d.h. senkrecht zur Hauptrichtung (Längsachse) des Wickelkörpers angeordnet werden. Allerdings magnetisiert das Feld derartig angeordneter Korrekturspulen den in weiten Teilen ungesättigten Wickelkörper auf und verteilt sich auf diese Weise über die ganze Länge des Undulators. Daher eignen sich lokale Korrekturspulen trotz ihrer Bezeichnung nicht für eine effektive lokale Feldfehlerkorrektur.To avoid these disadvantages, the local correction coils should be laterally, i. are arranged perpendicular to the main direction (longitudinal axis) of the bobbin. However, the field of correction coils arranged in this way magnetizes the largely unsaturated winding body and in this way distributes itself over the entire length of the undulator. Therefore, despite their designation, local correction coils are not suitable for effective local field error correction.
Ausgehend davon ist es die Aufgabe der Erfindung, einen Undulator anzugeben, der die vorher genannten Nachteile und Einschränkungen nicht aufweist. Insbesondere soll ein Undulator bereitgestellt wer- den, der eine effektive lokale Feldfehlerkorrektur {Shimming) durch lateral angebrachte Korrekturspulen ermöglicht.Based on this, it is the object of the invention to provide an undulator which does not have the aforementioned disadvantages and limitations. In particular, an undulator should be provided. the one that enables effective local field error correction by laterally mounted correction coils.
Gelöst wird diese Aufgabe durch die Merkmale des Patentanspruchs 1. Die Unteransprüche beschreiben vorteilhafte Ausgestaltungen der Erfindung.This object is achieved by the features of claim 1. The dependent claims describe advantageous embodiments of the invention.
Die der Erfindung zu Grunde liegende Idee besteht darin, den magnetischen Fluss in longitudinaler Richtung, d.h. entlang der Hauptrichtung des Wickelkörpers, zu unterbrechen. Auf diese Weise wird es möglich, ein sehr gut lokalisiertes Korrekturfeld durch laterale Korrekturspulen, die an den betreffenden Polen des Undulators angebracht sind, zu erzeugen.The idea underlying the invention is to control the magnetic flux in the longitudinal direction, i. along the main direction of the bobbin, to interrupt. In this way it becomes possible to produce a very well located correction field by lateral correction coils attached to the relevant poles of the undulator.
Diese Idee wird durch den erfindungsgemäßen Aufbau des Wickelkörpers in Form einer Laminierung realisiert. Hierzu wird der Wickelkörper abwechselnd aus magnetischen und nicht-magnetischen Lagen (Schichten, Scheiben) , die jeweils nicht parallel zur Strahlachse stehen, aufgebaut.This idea is realized by the inventive structure of the wound body in the form of a lamination. For this purpose, the winding body is alternately composed of magnetic and non-magnetic layers (layers, disks), which are not parallel to the beam axis, respectively.
In einer besonderen Ausgestaltung wird die Laminierung durch einen Aufbau des Wickelkörpers aus abwechselnd angeordneten weichmagnetischen Polblechen und nicht-magnetischen Blechen, die als Wickelgrund für die Spulenpakete dienen und die den magnetischen Fluss in longitudinaler Richtung unterbrechen, realisiert. Die Korrekturspulen sind an den hierfür benötigten Stellen jeweils lateral in Bezug auf die Längsachse des Wickelkörpers angebracht.In a particular embodiment, the lamination is realized by a structure of the winding body of alternately arranged soft magnetic Polblechen and non-magnetic sheets, which serve as a winding base for the coil packs and interrupt the magnetic flux in the longitudinal direction. The correction coils are each mounted laterally relative to the longitudinal axis of the winding body at the locations required for this purpose.
Eine erfindungsgemäße Vorrichtung besteht somit aus zwei Teil- Undulatoren, zwischen denen der Teilchenstrom, der z. B. aus Elektronen besteht, eingebracht ist. Hierbei weist jeder Teil-Undulator einen Wickelkörper auf, der so ausgestaltet ist, dass er sich zur Aufnahme eines Spulenpakets und einer Vielzahl, vorzugsweise von 20 bis 500, besonders bevorzugt von 50 bis 200, von magnetischen Polen des Undulators eignet. Hierbei besteht der Wickelkörper abwechselnd aus -A- einer Vielzahl, vorzugsweise von 20 bis 500, besonders bevorzugt vonA device according to the invention thus consists of two partial undulators, between which the particle flow, the z. B. consists of electrons, is introduced. In this case, each partial undulator has a winding body which is designed such that it is suitable for receiving a coil package and a plurality, preferably from 20 to 500, particularly preferably from 50 to 200, of magnetic poles of the undulator. Here, the winding body consists of alternating -A- a variety, preferably from 20 to 500, more preferably from
50 bis 200, von ersten Lagen und von zweiten Lagen, die derart angeordnet sind, dass sie parallel zueinander, jedoch nicht parallel zur Richtung des Teilchenstroms stehen.50 to 200, first layers and second layers arranged to be parallel to each other but not parallel to the direction of particle flow.
In einer besonderen Ausgestaltung nehmen die ersten Lagen und die hierzu parallelen zweiten Lagen jedes Wickelkorpers einen Winkel von 15° bis 165°, bevorzugt von 60° bis 120°, besonders bevorzugt annah- rend 90° in Bezug auf den Teilchenstrom ein. Im Falle, dass der genannte Winkel annahrend 90° betragt, handelt es sich bei der vorlie¬ genden Erfindung um eine Weiterentwicklung eines herkömmlichen supraleitenden Undulators, ansonsten um eine Weiterentwicklung eines heiischen supraleitenden Undulators gemäß der DE 103 58 225 B3.In a particular embodiment, the first layers and the second layers of each winding body parallel thereto assume an angle of 15 ° to 165 °, preferably of 60 ° to 120 °, particularly preferably approximately 90 ° with respect to the particle flow. In the event that the said angle amounts to Anna while 90 ° is in the vorlie ¬ constricting invention is a further development of a conventional superconducting undulator, otherwise a further development of a heiischen superconducting undulator according to DE 103 58 225 B3.
Die ersten Lagen bestehen jeweils zumindest teilweise aus einem nicht-magnetischen Material, das geometrisch so ausgestaltet und angeordnet ist, dass darüber das vorzugsweise supraleitende Spulenpaket gefuhrt wird. Als Material werden bevorzugt nicht-magnetische Bleche, insbesondere aus Kupfer oder aus einem glasfaserverstärkten Kunststoff eingesetzt.The first layers are each at least partially made of a non-magnetic material, which is geometrically configured and arranged so that the preferably superconducting coil package is guided over it. The material used is preferably non-magnetic sheets, in particular made of copper or a glass fiber reinforced plastic.
Die zweiten Lagen bestehen jeweils zumindest teilweise aus einem weichmagnetischen Material, die als Pole des Undulators dienen. Als Material werden vorzugsweise weichmagnetische Polbleche, insbesondere aus Eisen oder einer Eisenkobaltlegierung eingesetzt.The second layers each consist at least partially of a soft magnetic material, which serve as poles of the undulator. Soft magnetic pole plates, in particular made of iron or an iron cobalt alloy, are preferably used as the material.
Bevorzugt sind die ersten Lagen und die zweiten Lagen jeweils gleich dick, wobei das Verhältnis der Dicke der ersten Lagen zur Dicke der zweiten Lagen von 1:1 bis 3:1 betragt.Preferably, the first layers and the second layers are each of the same thickness, wherein the ratio of the thickness of the first layers to the thickness of the second layers is from 1: 1 to 3: 1.
Erfindungsgemaß wird an den Undulator mindestens eine Korrekturspule lateral in Bezug auf die Achse des Wickelkorpers an eine der zweiten Lagen angebracht oder in eine Aussparung im Wickelkorper in eine der zweiten Lagen eingebracht. Insbesondere ist es vorteilhaft, gleichzeitig jeweils 2 Korrekturspulen an einander gegenüberliegenden zwei- ten lagen der beiden Teil-Undulatoren anzubringen. Wie unten gezeigt wird, ermöglicht der besondere Aufbau des erfindungsgemäßen Undula- tors die Erzeugung eines wohl lokalisierten Korrekturfeldes durch laterale Korrekturspulen.According to the invention, at least one correction coil is laterally attached to one of the second layers or introduced into a recess in the winding body in one of the second layers with respect to the axis of the winding body. In particular, it is advantageous, at the same time, to apply in each case 2 correction coils on opposing two the two partial undulators. As will be shown below, the particular structure of the undulator according to the invention enables the generation of a well-localized correction field by lateral correction coils.
Die Erfindung weist insbesondere die im Folgenden erwähnten Vorteile auf. Der erfindungsgemäße Undulator ermöglicht eine effektive lokale Feldfehlerkorrektur {Shimming) durch das Anbringen von lateralen Korrekturspulen an ausgewählten zweiten Lagen. Bei Einsatz eines gut wärmeleitenden nicht-magnetischen Materials kann der Wärmetransport durch den Wickelkörper und damit insgesamt die Kühlung der Spulen verbessert werden.The invention has in particular the advantages mentioned below. The undulator of the present invention enables effective local field error correction by attaching lateral correction coils to selected second layers. When using a good thermal conductivity non-magnetic material, the heat transport through the bobbin and thus the overall cooling of the coils can be improved.
Die Erfindung wird im Folgenden anhand eines Ausführungsbeispiels und den Figuren näher erläutert. Hierbei zeigen:The invention will be explained in more detail below with reference to an embodiment and the figures. Hereby show:
Fig. 1 Schematische Darstellung des Aufbaus eines erfindungsgemäßen supraleitenden Undulators;Fig. 1 Schematic representation of the structure of a superconducting undulator according to the invention;
Fig. 2 Schematische Darstellung des Aufbaus eines erfindungsgemäßen supraleitenden Undulators, um 30° gegenüber Fig. 1 gedreht, mit eingebrachter Korrekturspule;Fig. 2 Schematic representation of the structure of a superconducting undulator according to the invention, rotated by 30 ° with respect to Figure 1, with introduced correction coil.
Fig. 3 Verlauf des Magnetfelds auf der Strahlachse, erzeugt von einem Undulator mit lateralen Korrekturspulen gemäß dem Stand der Technik (a) bzw. bei Einsatz eines erfindungsgemäßen supraleitenden Undulators (b) .Fig. 3 Course of the magnetic field on the beam axis, generated by an undulator with lateral correction coils according to the prior art (a) or when using a superconducting undulator according to the invention (b).
In Fig. 1 ist der Aufbau eines erfindungsgemäßen supraleitenden Undulators 10 schematisch dargestellt. Der Undulator 10 besteht aus zwei Teil-Undulatoren 11, 12, zwischen denen der Teilchenstrom 1 aus Elektronen verläuft. Jeder Teil-Undulator 11, 12 besitzt einen Wickelkörper, der abwechselnd aus einer parallel zueinander angebrachten Vielzahl von ersten Lagen 21, 21' , 21' ' , ... und von zweiten Lagen 22, 22' , 22" , ... besteht. Die ersten und zweiten Lagen sind in diesem Beispiel so angeordnet, dass sie jeweils senkrecht zur Richtung des Teilchenstroms 1 stehen. Die ersten Lagen 21, 21', 21'', ... bestehen jeweils aus Kupferblechen als nicht-magnetischem Material, über das das supraleitende Spulenpaket geführt wird. Die zweiten Lagen 22, 22', 22'', ... bestehen jeweils aus Eisenblechen als weichmagnetischem Material und dienen hierbei als Pole des Undulators.In Fig. 1, the structure of a superconducting undulator 10 according to the invention is shown schematically. The undulator 10 consists of two partial undulators 11, 12, between which the particle flow 1 is made of electrons. Each sub-undulator 11, 12 has a winding body, which alternately from a parallel to each other mounted plurality of first layers 21, 21 ', 21'', ... and second layers 22, 22', 22 ", ... consists , The first and second layers are arranged in this example so that they are each perpendicular to the direction of the particle stream 1. The first layers 21, 21 ', 21'', ... are each made of copper sheets as a non-magnetic material over which the superconducting coil package is guided. The second layers 22, 22 ', 22'', ... each consist of iron sheets as a soft magnetic material and serve here as the poles of the undulator.
In Fig. 2 ist der Aufbau eines erfindungsgemäßen supraleitenden Undulators 10, der um ca. 30° gegenüber dem Undulator aus Fig. 1 gedreht ist und der zusätzlich die Korrekturspulen 31, 31' aufweist, schematisch dargestellt. Die Korrekturspulen 31, 31' sind hierbei in jedem Teil-Undulator 11, 12 jeweils lateral in Bezug auf die Achse des Wickelkörpers um eine der zweiten Lagen gewickelt. Alternativ eignet sich auch ein Anbringen der Korrekturspulen 31, 31'- an eine der zweiten Lagen durch Kleben, Anschrauben oder ein anderes Befestigungsverfahren.In Fig. 2, the structure of a superconducting undulator 10 according to the invention, which is rotated by approximately 30 ° with respect to the undulator of FIG. 1 and in addition the correction coils 31, 31 ', shown schematically. The correction coils 31, 31 'are in this case wound in each sub-undulator 11, 12 each laterally with respect to the axis of the winding body to one of the second layers. Alternatively, it is also suitable to attach the correction coils 31, 31 'to one of the second layers by gluing, screwing on or another fastening method.
Finite-Elemente-Rechnungen zeigen, wie in Fig. 3 dargestellt, dass der besondere Aufbau des erfindungsgemäßen Undulators die Erzeugung eines wohl lokalisierten Korrekturfeldes durch laterale Korrekturspu¬ len 31, 31' ermöglicht. In Fig. 3a ist der berechnete Verlauf des Magnetfelds auf der Strahlachse bei Einsatz von lateralen Korrekturspulen in einem Undulator gemäß dem Stand der Technik dargestellt. Hierbei wurde der durchgehende unmagnetisierte Wickelkörper durch die Korrekturspulen vollständig aufmagnetisiert . Hieraus ist ersichtlich, dass der Einsatz von lateral angebrachten Korrekturspulen keine lokale Korrektur des' lokalen Magnetfelds in einem herkömmlichen Undulator erlaubt .Finite element calculations show, as shown in FIG. 3, that the particular construction of the undulator according to the invention makes it possible to generate a well-localized correction field by means of lateral correction coils 31, 31 '. FIG. 3 a shows the calculated course of the magnetic field on the beam axis when using lateral correction coils in an undulator according to the prior art. Here, the continuous unmagnetized bobbin was completely magnetized by the correction coils. It can be seen that the use of laterally mounted correction coils does not allow local correction of the 'local magnetic field in a conventional undulator.
Demgegenüber zeigt Fig. 3b den berechneten Verlauf des Magnetfelds auf der Strahlachse bei Einsatz eines erfindungsgemäßen laminierten Undulators. Hieraus ergibt sich, dass nunmehr der Einsatz von lateral angebrachten Korrekturspulen eine wohl definierte lokale Korrektur des lokalen Magnetfelds in einem erfindungsgemäßen Undulator erlaubt. In contrast, Fig. 3b shows the calculated course of the magnetic field on the beam axis when using a laminated undulator according to the invention. It follows that now the use of laterally mounted correction coils allows a well-defined local correction of the local magnetic field in an undulator according to the invention.

Claims

Patentansprüche claims
1. Undulator (10) zur Erzeugung von Synchrotronstrahlung aus einem in diesen eingebrachten Teilchenstrom (1) , umfassend zwei Teil- Undulatoren (11, 12), zwischen denen der Teilchenstrom (1) eingebracht ist, wobei jeder Teil-Undulator (11, 12) einen Wickelkörper zur Aufnahme eines Spulenpakets und einer Vielzahl von magnetischen Polen des Undulators enthält, wobei der Wickelkörper abwechselnd aus einer parallel zueinander angebrachten Vielzahl von ersten Lagen (21, 21', 21'', ...) und von zweiten Lagen (22, 22', 22'',...), die jeweils nicht parallel zur Richtung des Teilchenstroms (1) angeordnet sind, aufgebaut ist, wobei die ersten Lagen (21, 21', 21'', ...) jeweils ein nicht-magnetisches Material, über das das Spulenpaket geführt wird, enthalten und die zweiten Lagen (22, 22', 22'', ...) jeweils ein weichmagnetisches Material, die als Pole des Undulators dienen, aufweisen, dadurch gekennzeichnet, dass eine Korrekturspule (31) lateral in Bezug auf die Längsachse des Wickelkörpers an eine der zweiten Lagen angebracht oder in eine Aussparung im Wickelkörper in eine der zweiten Lagen eingebracht ist.An undulator (10) for generating synchrotron radiation from a particle stream (1) introduced therein, comprising two sub-undulators (11, 12) between which the particle stream (1) is introduced, each sub-undulator (11, 12 ) comprises a winding body for receiving a package of coils and a plurality of magnetic poles of the undulator, wherein the winding body alternately from a parallel plurality of first layers (21, 21 ', 21' ', ...) and second layers (22 , 22 ', 22 ", ...), each of which is not arranged parallel to the direction of the particle stream (1), is constructed, the first layers (21, 21', 21", Non-magnetic material over which the coil package is guided, and the second layers (22, 22 ', 22' ', ...) each have a soft magnetic material, which serve as poles of the undulator, characterized in that a Correction coil (31) laterally with respect to the longitudinal axis of the winding body Rs attached to one of the second layers or is introduced into a recess in the winding body in one of the second layers.
2. Undulator nach Anspruch 1, dadurch gekennzeichnet, dass das Verhältnis der Dicke der ersten Lagen zur Dicke der zweiten Lagen von 1:1 bis 3:1 beträgt.2. undulator according to claim 1, characterized in that the ratio of the thickness of the first layers to the thickness of the second layers of 1: 1 to 3: 1.
3. Undulator nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass Kupfer oder ein glasfaserverstärkter Kunststoff als nichtmagnetisches Material dient.3. undulator according to claim 1 or 2, characterized in that copper or a glass fiber reinforced plastic serves as a non-magnetic material.
4. Undulator nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass Eisen oder eine Eisenkobaltlegierung als weichmagnetisches Material dient. 4. undulator according to one of claims 1 to 3, characterized in that iron or an iron-cobalt alloy serves as a soft magnetic material.
5. Undulator nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die ersten Lagen (21, 21', 21'', ...) und die zweiten Lagen (22, 22', 22'', ...) jedes Wickelkörpers einen Winkel von 15° bis 165° in Bezug auf den Teilchenstrom (1) annehmen.5. undulator according to one of claims 1 to 4, characterized in that the first layers (21, 21 ', 21' ', ...) and the second layers (22, 22', 22 '', ...) each bobbin an angle of 15 ° to 165 ° with respect to the particle flow (1) assume.
6. undulator nach Anspruch 5, dadurch gekennzeichnet, dass als Winkel ein Wert von 60° bis 120° ausgewählt wird. 6. undulator according to claim 5, characterized in that a value of 60 ° to 120 ° is selected as the angle.
EP09748993.4A 2008-10-24 2009-10-17 Undulator for producing synchrotron radiation Active EP2340692B1 (en)

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CN102930916A (en) * 2012-10-31 2013-02-13 中国科学院上海应用物理研究所 High temperature superconducting runway coil array type undulator
CN102945722B (en) * 2012-11-27 2015-04-15 中国科学院上海应用物理研究所 Magnesium diboride superconductive undulator
CN113363046B (en) * 2021-05-26 2023-01-17 中国科学院高能物理研究所 Superconducting undulator and wire changing method thereof
US11600416B1 (en) * 2021-08-16 2023-03-07 National Synchrotron Radiation Research Center Cryogen-free high-temperature superconductor undulator structure and method for manufacturing the same

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