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000275967 0247_ $$2datacite_doi$$a10.3204/DESY-THESIS-2015-043
000275967 037__ $$aPUBDB-2015-04348
000275967 041__ $$aEnglish
000275967 0881_ $$aDESY-THESIS-2015-043
000275967 088__ $$2DESY$$aDESY-THESIS-2015-043
000275967 1001_ $$0P:(DE-H253)PIP1012664$$aSerkez, Svitozar$$b0$$eCorresponding author$$gmale$$udesy
000275967 245__ $$aDesign and Optimization of the Grating Monochromator for Soft X-Ray Self-Seeding FELs$$f2012-10-22 - 2015-11-30
000275967 260__ $$aHamburg$$bVerlag Deutsches Elektronen-Synchrotron$$c2015
000275967 300__ $$a143
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000275967 3367_ $$2ORCID$$aDISSERTATION
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000275967 3367_ $$02$$2EndNote$$aThesis
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000275967 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1453819905_19336
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000275967 4900_ $$0PERI:(DE-600)1437131-5$$aDESY-THESIS$$x1435-8085
000275967 502__ $$aUniversität Hamburg, Diss., 2015$$bDr.$$cUniversität Hamburg$$d2015
000275967 520__ $$aThe emergence of Free Electron Lasers (FEL) as a fourth generation of light sources is a breakthrough. FELs operating in the X-ray range (XFEL) allow one to carry out completely new experiments that probably most of the natural sciences would benefit. Self-amplified spontaneous emission (SASE) is the baseline FEL operation mode: the radiation pulse starts as a spontaneous emission from the electron bunch and is being amplified during an FEL process until it reaches saturation. The SASE FEL radiation usually has poor properties in terms of a spectral bandwidth or, on the other side, longitudinal coherence. Self-seeding is a promising approach to narrow the SASE bandwidth of XFELs significantly in order to produce nearly transform-limited pulses. It is achieved by the radiation pulse monochromatization in the middle of an FEL amplification process. Following the successful demonstration of the self-seeding setup in the hard X-ray range at the LCLS, there is a need for a self-seeding extension into the soft X-ray range.Here a numerical method to simulate the soft X-ray self seeding (SXRSS) monochromator performance is presented. It allows one to perform start-to-end self-seeded FEL simulations along with (in our case) GENESIS simulation code. Based on this method, the performance of the LCLS self-seeded operation was simulated showing a good agreement with an experiment. Also the SXRSS monochromator design developed in SLAC was adapted for the SASE3 type undulator beamline at the European XFEL.The optical system was studied using Gaussian beam optics, wave optics propagation method and ray tracing to evaluate the performance of the monochromator itself. Wave optics analysis takes into account the actual beam wavefront of the radiation from the coherent FEL source, third order aberrations and height errors from each optical element.The monochromator design is based on a toroidal VLS grating working at a fixed incidence angle mounting without both entrance and exit slits. It is optimized for the spectral range of $300-1200$~eV providing resolving power above $ 7000 $. The proposed monochromator is composed of three mirrors and the grating. Start-to-end simulation as a case study of the self-seeded European XFEL performance with a proposed SXRSS monochromator is presented. It shows that the laser pulse power reaches a TW-level with its spectral density about eighty times higher than that of the conventional SASE pulse at saturation.
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