000618817 001__ 618817 000618817 005__ 20250805211944.0 000618817 0247_ $$2doi$$a10.1088/1742-6596/3010/1/012019 000618817 0247_ $$2ISSN$$a1742-6588 000618817 0247_ $$2ISSN$$a1742-6596 000618817 0247_ $$2datacite_doi$$a10.3204/PUBDB-2024-07171 000618817 0247_ $$2openalex$$aopenalex:W4411062180 000618817 037__ $$aPUBDB-2024-07171 000618817 041__ $$aEnglish 000618817 082__ $$a530 000618817 1001_ $$0P:(DE-H253)PIP1098433$$aGötze, Kathrin$$b0$$eCorresponding author 000618817 1112_ $$a15th International Conference on Synchrotron Radiation Instrumentation$$cHamburg$$d2024-08-26 - 2024-08-30$$gSRI 2024$$wGermany 000618817 245__ $$aCorrector coils with variable field direction for FLASH 2020 000618817 260__ $$aBristol$$bIOP Publ.$$c2025 000618817 300__ $$a4 000618817 3367_ $$2ORCID$$aCONFERENCE_PAPER 000618817 3367_ $$033$$2EndNote$$aConference Paper 000618817 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$mjournal 000618817 3367_ $$2BibTeX$$aINPROCEEDINGS 000618817 3367_ $$2DRIVER$$aconferenceObject 000618817 3367_ $$2DataCite$$aOutput Types/Conference Paper 000618817 3367_ $$0PUB:(DE-HGF)8$$2PUB:(DE-HGF)$$aContribution to a conference proceedings$$bcontrib$$mcontrib$$s1754385978_2840332 000618817 500__ $$a2025 J. Phys.: Conf. Ser. 3030 000618817 520__ $$aDespite thorough tuning of insertion devices for storage rings or linear accelerators,a (usually gap dependent) kick to the electron beam remains and has to becorrected with the help of steerer coils. These small, resistive coils are placed upstreamand downstream of an undulator and by varying the strength and direction of the generatedmagnetic field, they allow to deflect the beam by a small angle and to consequentlycorrect its trajectory. For the upgrade of the free-electron laser FLASH at DESY Hamburgwe have developed compact and cost-efficient air-cooled steerer coils based on asolid ferrite core around which four sub-coils are wound in a particular geometry. Byenergizing these coils separately, the deflecting field can be tuned and adapted to the gapdependent kick. The ferrite core enhances the coil strength by more than 50% comparedto previous designs enabling them to generate 0.53(0.44)Tmm for horizontal (vertical)field at 1A while still making the steerer suitable for use in a slow feedback system. 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