000472675 001__ 472675 000472675 005__ 20250724175840.0 000472675 0247_ $$2doi$$a10.18429/JACOW-IPAC2021-TUPAB086 000472675 0247_ $$2datacite_doi$$a10.3204/PUBDB-2021-05169 000472675 0247_ $$2openalex$$aopenalex:W3204230841 000472675 037__ $$aPUBDB-2021-05169 000472675 041__ $$aEnglish 000472675 1001_ $$0P:(DE-H253)PIP1029466$$aAllaria, Enrico$$b0$$eCorresponding author$$udesy 000472675 1112_ $$a12th International Particle Accelerator Conference$$cCampinas$$d2021-05-24 - 2021-05-28$$gIPAC21$$wBrazil 000472675 245__ $$aFLASH2020+ Plans for a New Coherent Source at DESY 000472675 260__ $$bJACoW Publishing, Geneva, Switzerland$$c2021 000472675 29510 $$aProceedings of the 12th International Particle Accelerator Conference, IPAC2021, Campinas, SP, Brazil 000472675 300__ $$a4 000472675 3367_ $$2ORCID$$aCONFERENCE_PAPER 000472675 3367_ $$033$$2EndNote$$aConference Paper 000472675 3367_ $$2BibTeX$$aINPROCEEDINGS 000472675 3367_ $$2DRIVER$$aconferenceObject 000472675 3367_ $$2DataCite$$aOutput Types/Conference Paper 000472675 3367_ $$0PUB:(DE-HGF)8$$2PUB:(DE-HGF)$$aContribution to a conference proceedings$$bcontrib$$mcontrib$$s1644504297_29146 000472675 3367_ $$0PUB:(DE-HGF)7$$2PUB:(DE-HGF)$$aContribution to a book$$mcontb 000472675 520__ $$aWith FLASH2020+, a major upgrade of the FLASH facility has started to meet the new requirements of the growing soft-x ray user community. The design of the FEL beamlines aims at photon properties suitable to the needs of future user experiments with high repetition rate XUV and soft X-ray radiation. By the end of the project, both existing FEL lines at FLASH will be equipped with fully tunable undulators capable of delivering photon pulses with variable polarization. The use of the external seeding at 1 MHz in burst mode is part of the design of the new FLASH1 beamline, while FLASH2 will exploit novel lasing concepts based on different undulator configurations. The new FLASH2020+ will rely on an electron beam energy of 1.35 GeV that will extend the accessible wavelength range to the oxygen K-edge with variable polarization. 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