EP2279650B1 - Dispositif pour réduire l'erreur de phase d'un ondulateur supraconducteur - Google Patents

Dispositif pour réduire l'erreur de phase d'un ondulateur supraconducteur Download PDF

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Publication number
EP2279650B1
EP2279650B1 EP09749568A EP09749568A EP2279650B1 EP 2279650 B1 EP2279650 B1 EP 2279650B1 EP 09749568 A EP09749568 A EP 09749568A EP 09749568 A EP09749568 A EP 09749568A EP 2279650 B1 EP2279650 B1 EP 2279650B1
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EP
European Patent Office
Prior art keywords
superconducting
undulator
rows
poles
closed
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EP09749568A
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German (de)
English (en)
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EP2279650A1 (fr
Inventor
Robert Rossmanith
Daniel Wollmann
Axel Bernhard
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Karlsruher Institut fuer Technologie KIT
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Karlsruher Institut fuer Technologie KIT
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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

Definitions

  • the invention relates to a device for reducing the phase error of a superconducting undulator according to the preamble of claim 1.
  • the quality of the undulator is limited by field errors even in superconducting undulators.
  • the field strengths in the individual periods of the undulator may differ slightly. This forms a phase error that reduces the quality of the photon beam generated in the undulator.
  • phase error should be able to be reduced by means of such a device without requiring cooling, heating and renewed cooling of the superconducting undulator.
  • the device according to the invention serves to reduce the phase error of a superconducting undulator having two rows of juxtaposed magnetic poles between which the beam is passed, with two adjacent poles in a row differing in the sign of their magnetic field.
  • the device according to the invention has at least one closed superconducting loop which is arranged so that it encloses at least two poles in one of the two rows of the undulator. This type of arrangement according to the invention ensures that regardless of which of the two poles in one of the two rows of the undulator, which lies within a closed loop, actually has an error, the phase error occurring thereby is compensated.
  • the at least one superconductive loop is arranged so that it is between the two rows of the undulator, between which the beam is performed.
  • an even number of adjacent poles in each of the two rows of the undulator is enclosed with a superconducting loop.
  • a row contains at least two, preferably a plurality of closed superconducting loops, which are arranged such that in each case two adjacent poles in one of the two rows of the undulator are provided with a superconducting loop enclosing them.
  • the superconducting loops are arranged with respect to each other such that each pole in one of the two rows of the undulator is simultaneously enclosed by two adjacent superconducting loops.
  • x denotes the new field value
  • k 1 to k n-1 are the correction values generated by the coils. Since the field through the coils was equal to zero before the coils were switched on, according to the law of Lenz, this value remains only if the new field in all partial coils is exactly identical x. Since the illustrated system of equations with n unknowns consists of n equations, it is uniquely solvable.
  • the at least one closed superconducting loop is applied to a substrate (foil) or introduced into a substrate (foil).
  • This substrate (foil) is preferably located on one side of the magnetic poles located in one of the two rows.
  • the at least one closed superconductive loop is made of a material which preferably contains a high-temperature superconductor.
  • closed superconducting loops are also used, which consist of a material containing a low-temperature superconductor.
  • the device according to the invention whose loops are additionally introduced into the undulator, compensates for the phase errors of the superconducting undulator independently.
  • the phase error can be reduced without requiring cooling, warming, and re-cooling of the superconducting undulator.
  • the possible magnetic errors, as they occur in a real superconducting undulator, shows by way of example Fig. 1 ,
  • the undulator shown there has two coils 1, 2 , between which there is a gap 3 into which an electron beam can be introduced.
  • the coils 1, 2 superconducting conductor packages in the form of wire bundles 11, 12, 13, 14, 15 (upper row), 21, 22, 23, 24, 25 (lower row) are mounted. Due to errors in the height of the wire bundles 21, 22 from the superconducting conductor packages and in the height of the poles between the wire bundles 13 and 14 or 24 and 25 , the fields are different from period to period.
  • Fig. 2a shows an alternating magnetic field as observed with a pole located at a different position (pole height) can. This deviation leads to the in Fig. 2b shown difference (solid line) between the ideal undulator field (dashed line) and the actually observable field with pole error Fig. 2a ,
  • Fig. 3a shows an alternating magnetic field, as can be observed with a conductor bundle, which is located at a different position. This deviation leads to the in Fig. 3b shown difference (solid line) between the ideal undulator field (dashed line) and the actually observable field with conductor bundle error Fig. 3a ,
  • Fig. 5 shows a two-period field with pole errors corrected with a three closed superconducting loop device according to the invention. This correction leads from the magnetic field shown as a dashed line to the corrected magnetic field shown as a solid line.

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

Claims (8)

  1. Dispositif pour réduire l'erreur de phase d'un ondulateur supraconducteur qui comporte deux rangées (11, 12, 13, 14, 15 ; 21, 22, 23, 24, 25) de pôles magnétiques respectivement situés côte à côte, deux pôles voisins respectifs dans l'une des deux rangées se distinguant par le signe de polarité de leur champ magnétique, et le dispositif comprenant au moins une boucle supraconductrice fermée (y1,...yn),
    caractérisé en ce que
    la boucle supraconductrice fermée (y1,...yn) est disposée de façon à entourer au moins deux pôles dans l'une des deux rangées de l'ondulateur.
  2. Dispositif conforme à la revendication 1,
    caractérisé en ce que
    la boucle supraconductrice (y1,...yn) est située entre les deux rangées (11, 12, 13, 14, 15 ; 21, 22, 23, 24, 25) de l'ondulateur.
  3. Dispositif conforme à la revendication 1 ou 2,
    caractérisé en ce qu'
    un nombre pair de pôles voisins de l'une des deux rangées (11, 12, 13, 14, 15 ; 21, 22, 23, 24, 25) est équipé d'une boucle supraconductrice (y1,...yn) qui les entoure.
  4. Dispositif conforme à l'une des revendications 1 à 3,
    caractérisé en ce qu'
    il comporte, dans l'une des deux rangées (11, 12, 13, 14, 15 ; 21, 22, 23, 24, 25) au moins deux boucles supraconductrices fermées (y1, y2,...yn-1, yn), au moins deux boucles supraconductrices voisines (y1, y2,...yn-1, yn) se chevauchant.
  5. Dispositif conforme à l'une des revendications 1 à 4,
    caractérisé en ce qu'
    il comporte, dans l'une des deux rangées (11, 12, 13, 14, 15 ; 21, 22, 23, 24, 25) au moins deux boucles supraconductrices fermées (y1, y2,...yn-1, yn), au moins deux boucles supraconductrices voisines (y1, y2,...yn-1, yn) étant contigües et couplées par des champs magnétiques.
  6. Dispositif conforme à l'une des revendications 1 à 5,
    caractérisé en ce qu'
    il comporte, dans l'une des deux rangées (11, 12, 13, 14, 15 ; 21, 22, 23, 24, 25) au moins deux boucles supraconductrices fermées y1, y2,...yn-1, yn), deux pôles voisins respectifs de l'ondulateur étant équipés d'une boucle supraconductrice (y1,... yn) qui les entoure, et, à l'exception du premier et du dernier pôle dans l'une des deux rangées, les boucles supraconductrice (y1, y2,...yn-1, yn) étant disposées l'une par rapport à l'autre de sorte que dans l'une des deux rangées (11, 12, 13, 14, 15 ; 21, 22, 23, 24, 25) chacun des pôles soit simultanément entouré par deux boucles supraconductrices voisines respectives (y1, y2,...yn-1, yn).
  7. Dispositif conforme à l'une des revendications 1 à 6,
    caractérisé en ce que
    la boucle supraconductrice fermée (y1,... yn) est appliquée sur un substrat ou introduite dans un substrat.
  8. Dispositif conforme à l'une des revendications 1 à 7,
    caractérisé en ce que
    la boucle supraconductrice fermée (y1,... yn) renferme un matériau présentant un supraconducteur à haute température.
EP09749568A 2008-05-17 2009-05-13 Dispositif pour réduire l'erreur de phase d'un ondulateur supraconducteur Active EP2279650B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810024073 DE102008024073A1 (de) 2008-05-17 2008-05-17 Vorrichtung zur Verringerung des Phasenfehlers eines supraleitenden Undulators
PCT/EP2009/003381 WO2009141078A1 (fr) 2008-05-17 2009-05-13 Dispositif pour réduire l'erreur de phase d'un ondulateur supraconducteur

Publications (2)

Publication Number Publication Date
EP2279650A1 EP2279650A1 (fr) 2011-02-02
EP2279650B1 true EP2279650B1 (fr) 2012-11-07

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EP (1) EP2279650B1 (fr)
DE (1) DE102008024073A1 (fr)
WO (1) WO2009141078A1 (fr)

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* Cited by examiner, † Cited by third party
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GB201903741D0 (en) 2019-03-19 2019-05-01 Res & Innovation Uk A multipole magnet

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3429887B2 (ja) * 1995-03-06 2003-07-28 三菱電機株式会社 周期磁界装置
US6858998B1 (en) * 2002-09-04 2005-02-22 The United States Of America As Represented By The United States Department Of Energy Variable-period undulators for synchrotron radiation
DE10358225B3 (de) * 2003-12-12 2005-06-30 Forschungszentrum Karlsruhe Gmbh Undulator und Verfahren zu dessen Betrieb

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WO2009141078A1 (fr) 2009-11-26
DE102008024073A1 (de) 2009-12-17
EP2279650A1 (fr) 2011-02-02

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