000610714 001__ 610714 000610714 005__ 20250728212115.0 000610714 0247_ $$2doi$$a10.1103/PhysRevAccelBeams.27.110703 000610714 0247_ $$2datacite_doi$$a10.3204/PUBDB-2024-04691 000610714 0247_ $$2arXiv$$aarXiv:2406.19984 000610714 0247_ $$2WOS$$aWOS:001371911700001 000610714 0247_ $$2openalex$$aopenalex:W4404586379 000610714 037__ $$aPUBDB-2024-04691 000610714 041__ $$aEnglish 000610714 082__ $$a530 000610714 088__ $$2DESY$$aDESY-24-091 000610714 088__ $$2arXiv$$aarXiv:2406.19984 000610714 1001_ $$0P:(DE-H253)PIP1001599$$aSchneidmiller, Evgeny Alexanrdovich$$b0$$eCorresponding author 000610714 245__ $$aTwo-bunch seeding of soft X-ray free electron lasers 000610714 260__ $$aCollege Park, MD$$bAmerican Physical Society$$c2024 000610714 3367_ $$2DRIVER$$aarticle 000610714 3367_ $$2DataCite$$aOutput Types/Journal article 000610714 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1736780988_3692155 000610714 3367_ $$2BibTeX$$aARTICLE 000610714 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000610714 3367_ $$00$$2EndNote$$aJournal Article 000610714 520__ $$aSeeded Free Electron Lasers (FELs) demonstrate a good performance and are successfully used in different user experiments in extreme ultraviolet and soft X-ray regimes. In this paper a simple modification of the seeding scenario is proposed relying on generation of two closely spaced bunches with very different properties: a low-current seeding bunch, and a high-current bunch that amplifies coherent radiation, produced by the seeding bunch. This approach eliminates different limitations and mitigates some harmful effects in the standard scenario. In particular, one can generate very high harmonic numbers with a moderate laser power in a simple high-gain harmonic generation (HGHG) scheme. Alternatively, in case of moderate harmonic numbers, one can strongly reduce the required laser power thus simplifying design of high repetition rate seeded FELs. An influence of beam dynamics effects (like nonlinearities of the longitudinal phase space of electron beams, coherent synchrotron radiation, longitudinal space charge, geometrical wakefields, microbunching instabilities etc.) on properties of output radiation (spectrum broadening, pedestals, stability) can be to a large extent reduced in the proposed scheme. In this paper we illustrate the operation of the two-bunch seeding scheme in HGHG configuration with realistic start-to-end simulations for the soft x-ray user facility FLASH. We show that nearly Fourier-limited multi-gigawatt pulses can be generated at 4 nm using the present compact design of the undulator system. With several thousand pulses per second this can be a unique source for photon science. 000610714 536__ $$0G:(DE-HGF)POF4-621$$a621 - Accelerator Research and Development (POF4-621)$$cPOF4-621$$fPOF IV$$x0 000610714 536__ $$0G:(DE-HGF)POF4-6G2$$a6G2 - FLASH (DESY) (POF4-6G2)$$cPOF4-6G2$$fPOF IV$$x1 000610714 542__ $$2Crossref$$i2024-11-21$$uhttps://creativecommons.org/licenses/by/4.0/ 000610714 588__ $$aDataset connected to CrossRef, Journals: bib-pubdb1.desy.de 000610714 693__ $$0EXP:(DE-H253)FLASH2020p-20221201$$1EXP:(DE-H253)FLASHII-20150901$$5EXP:(DE-H253)FLASH2020p-20221201$$aFLASH II$$eFLASH 2020+ Project$$x0 000610714 7001_ $$0P:(DE-H253)PIP1004226$$aZagorodnov, Igor$$b1 000610714 77318 $$2Crossref$$3journal-article$$a10.1103/physrevaccelbeams.27.110703$$bAmerican Physical Society (APS)$$d2024-11-21$$n11$$p110703$$tPhysical Review Accelerators and Beams$$v27$$x2469-9888$$y2024 000610714 773__ $$0PERI:(DE-600)2844143-6$$a10.1103/PhysRevAccelBeams.27.110703$$gVol. 27, no. 11, p. 110703$$n11$$p110703$$tPhysical review accelerators and beams$$v27$$x2469-9888$$y2024 000610714 7870_ $$0PUBDB-2025-00146$$aSchneidmiller, Evgeny Alexanrdovich et.al.$$d2024$$iIsParent$$rarXiv:2406.19984 ; 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