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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
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000610714 520__ $$aSeeded Free Electron Lasers (FELs) demonstrate a good performance and are successfully used in different user experiments in extreme ultraviolet and soft X-ray regimes. In this paper a simple modification of the seeding scenario is proposed relying on generation of two closely spaced bunches with very different properties: a low-current seeding bunch, and a high-current bunch that amplifies coherent radiation, produced by the seeding bunch. This approach eliminates different limitations and mitigates some harmful effects in the standard scenario. In particular, one can generate very high harmonic numbers with a moderate laser power in a simple high-gain harmonic generation (HGHG) scheme. Alternatively, in case of moderate harmonic numbers, one can strongly reduce the required laser power thus simplifying design of high repetition rate seeded FELs. An influence of beam dynamics effects (like nonlinearities of the longitudinal phase space of electron beams, coherent synchrotron radiation, longitudinal space charge, geometrical wakefields, microbunching instabilities etc.) on properties of output radiation (spectrum broadening, pedestals, stability) can be to a large extent reduced in the proposed scheme. In this paper we illustrate the operation of the two-bunch seeding scheme in HGHG configuration with realistic start-to-end simulations for the soft x-ray user facility FLASH. We show that nearly Fourier-limited multi-gigawatt pulses can be generated at 4 nm using the present compact design of the undulator system. With several thousand pulses per second this can be a unique source for photon science.
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000610714 7001_ $$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$$rarXiv:2406.19984 ; DESY-24-091$$tTwo-bunch seeding of soft x-ray free electron lasers
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