000472718 001__ 472718 000472718 005__ 20250724175840.0 000472718 0247_ $$2doi$$a10.18429/JACOW-IPAC2021-TUPAB122 000472718 0247_ $$2datacite_doi$$a10.3204/PUBDB-2021-05193 000472718 0247_ $$2openalex$$aopenalex:W3204394018 000472718 037__ $$aPUBDB-2021-05193 000472718 041__ $$aEnglish 000472718 1001_ $$0P:(DE-H253)PIP1010725$$aKarabekyan, Suren$$b0$$eCorresponding author 000472718 1112_ $$a12th International Particle Accelerator Conference$$cCampinas$$d2021-05-24 - 2021-05-28$$gIPAC21$$wBrazil 000472718 245__ $$aSASE3 Variable Polarization Project at the European XFEL 000472718 260__ $$c2021 000472718 29510 $$aProceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil 000472718 300__ $$a3 000472718 3367_ $$2ORCID$$aCONFERENCE_PAPER 000472718 3367_ $$033$$2EndNote$$aConference Paper 000472718 3367_ $$2BibTeX$$aINPROCEEDINGS 000472718 3367_ $$2DRIVER$$aconferenceObject 000472718 3367_ $$2DataCite$$aOutput Types/Conference Paper 000472718 3367_ $$0PUB:(DE-HGF)8$$2PUB:(DE-HGF)$$aContribution to a conference proceedings$$bcontrib$$mcontrib$$s1639057928_17504 000472718 3367_ $$0PUB:(DE-HGF)7$$2PUB:(DE-HGF)$$aContribution to a book$$mcontb 000472718 520__ $$aAt the European XFEL, two undulator systems for hard and one for soft X-rays have been successfully put into operation. The SASE3 soft X-ray undulator system generates linearly polarized radiation in the horizontal plane. One of the requirements for extending the radiation characteristics is the ability to obtain different polarization modes. These include both right and left circular, elliptical polarization, or linear polarization at an arbitrary angle. For this purpose, a system consisting of four APPLE X helical undulators developed at the Paul Scherrer Institute (PSI) is used. This paper presents the design parameters of the SASE3 undulator system after modifying it with the helical afterburner. It also describes the methods and the design solutions different from those used at PSI. 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