EP2279650A1 - Vorrichtung zur verringerung des phasenfehlers eines supraleitenden undulators - Google Patents
Vorrichtung zur verringerung des phasenfehlers eines supraleitenden undulatorsInfo
- Publication number
- EP2279650A1 EP2279650A1 EP09749568A EP09749568A EP2279650A1 EP 2279650 A1 EP2279650 A1 EP 2279650A1 EP 09749568 A EP09749568 A EP 09749568A EP 09749568 A EP09749568 A EP 09749568A EP 2279650 A1 EP2279650 A1 EP 2279650A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- superconducting
- rows
- undulator
- poles
- closed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
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
- Jc 1 to k n - X 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 (film) or introduced into a substrate (film).
- 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.
- FIG. 1 representation of the two rows of a superconducting
- Fig. 2a Alternating magnetic field with a pole, which is located at a different position (pole height).
- Fig. 3a Alternating magnetic field with a conductor bundle, which is located at a different position.
- Fig. 4a Closed superconducting loop around a period with 2 poles: schematic diagram with rectangular field.
- Fig. 4b n closed superconducting loops in one of the two rows: Schematic representation with rectangular field.
- Fig. 5 Illustration of a two-period field with pole error, corrected with a device of 3 closed superconducting loops: before (dashed line) and after the correction (solid line).
- the possible magnetic errors occurring in a real superconducting undulator are shown by way of example in 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 it is observed in the case of a pole which is located at a different position (pole height). that can. This deviation leads to the difference shown in Fig. 2b (solid line) between the ideal undulator field (dashed line) and the actually observable field with pole error of Fig. 2a.
- FIG. 3a shows an alternating magnetic field, as can be observed with a conductor bundle which is in a different position. This deviation leads to the difference (solid line) shown in FIG. 3b between the ideal undulator field (dashed line) and the actually observable field with conductor bundle error from FIG. 3a.
- FIG. 4 a schematically illustrates a closed superconducting loop used according to the invention around a period with two poles as a schematic illustration with a rectangular field.
- U 1 , U ⁇ denote the uncorrected magnetic field strengths of the two poles
- W 1 , W 2 denote the magnetic field strengths of the two poles and Yi corrected by the device according to the invention the closed superconducting loop.
- n.gtoreq.2 closed superconducting loops used according to the invention are represented by a respective period with two poles as a schematic illustration with a rectangular field.
- each two adjacent superconducting loops are arranged so that they lie in a row together and are coupled together by magnetic fields.
- Fig. 5 shows a two-period field with pole errors corrected with a device according to the invention of three closed superconducting loops. This correction leads from the magnetic field shown as a dashed line to the corrected magnetic field shown as a solid line.
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Particle Accelerators (AREA)
Abstract
Description
Claims
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 (de) | 2008-05-17 | 2009-05-13 | Vorrichtung zur verringerung des phasenfehlers eines supraleitenden undulators |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2279650A1 true EP2279650A1 (de) | 2011-02-02 |
| EP2279650B1 EP2279650B1 (de) | 2012-11-07 |
Family
ID=40996799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP09749568A Active EP2279650B1 (de) | 2008-05-17 | 2009-05-13 | Vorrichtung zur verringerung des phasenfehlers eines supraleitenden undulators |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2279650B1 (de) |
| DE (1) | DE102008024073A1 (de) |
| WO (1) | WO2009141078A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201903741D0 (en) | 2019-03-19 | 2019-05-01 | Res & Innovation Uk | A multipole magnet |
| GB2598582A (en) | 2020-09-02 | 2022-03-09 | Meika Ltd | Pest repellers |
Family Cites Families (3)
| 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 |
-
2008
- 2008-05-17 DE DE200810024073 patent/DE102008024073A1/de not_active Ceased
-
2009
- 2009-05-13 EP EP09749568A patent/EP2279650B1/de active Active
- 2009-05-13 WO PCT/EP2009/003381 patent/WO2009141078A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009141078A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102008024073A1 (de) | 2009-12-17 |
| WO2009141078A1 (de) | 2009-11-26 |
| EP2279650B1 (de) | 2012-11-07 |
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