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000640169 005__ 20251111210855.0
000640169 0247_ $$2URN$$aurn:nbn:de:gbv:18-ediss-130584
000640169 0247_ $$2datacite_doi$$a10.3204/PUBDB-2025-04719
000640169 037__ $$aPUBDB-2025-04719
000640169 041__ $$aEnglish
000640169 1001_ $$0P:(DE-H253)PIP1097254$$aMohammadi Bidhendi, Mahdi$$b0$$eCorresponding author$$gmale$$udesy
000640169 245__ $$aTemporal Characterization of SASE FEL pulses at FLASH$$f2021-07-01 - 2025-06-30
000640169 260__ $$bStaats- und Universitätsbibliothek Hamburg Carl von Ossietzky$$c2025
000640169 300__ $$a122
000640169 3367_ $$2DataCite$$aOutput Types/Dissertation
000640169 3367_ $$2ORCID$$aDISSERTATION
000640169 3367_ $$2BibTeX$$aPHDTHESIS
000640169 3367_ $$02$$2EndNote$$aThesis
000640169 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1762864980_1868919
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000640169 502__ $$aDissertation, Universitätsbibliothek Hamburg, 2025$$bDissertation$$cUniversitätsbibliothek Hamburg$$d2025$$o2025-07-15
000640169 520__ $$aAt Free-Electron Lasers (FELs) based on Self-Amplified Spontaneous Emission (SASE), the radiation properties such as pulse duration, arrival time, energy and spectrum fluctuate from shot to shot. To accurately interpret the experimental data on a single-shot basis, dedicated diagnostic tools for each parameter are essential. One such technique is terahertz (THz) streaking, which enables single-shot characterization of the temporal properties of SASE FEL pulses. This thesis presents the design, implementation, and experimental validation of the FL21 beamline, a dedicated photon diagnostics beamline at the Free-electron LASer in Hamburg (FLASH) for extreme ultraviolet (XUV) pulse characterization using THz streaking. The results confirm the feasibility of using this setup for systematic long-term studies of SASE FEL pulse properties with high temporal resolution. Another key focus of this work is the measurement and characterization of a possible frequency chirp of SASE XUV pulses, frequency chirp refers to a variation in frequency along the pulse. Using two independent methods, THz streaking, which directly measures the linear frequency chirp, and electron bunch energy observation through a transverse deflecting structure (PolariX TDS), a good agreement between both approaches was demonstrated across various FEL settings. By comparing XUV pulse profiles reconstructed from PolariX TDS and THz streaking, the strengths and limitations of each approach in the determination of the pulse shape were identified. The complementary nature of these techniques enables more accurate pulse characterization, particularly in complex phase space scenarios. A comprehensive investigation of the fundamental and third harmonic FEL radiation properties throughout the amplification process was conducted using experimental measurements and FEL simulations. Variations in pulse duration, energy, and shot-to-shot fluctuations across different wavelengths were examined. The experimental results exhibit good agreement with the chirped three-dimensional time-dependent FEL simulation, confirming the existence of frequency chirp in FEL pulses. These insights enhance our understanding of the properties of FEL fundamental and harmonic radiation, paving the way for future FEL experiments.
000640169 536__ $$0G:(DE-HGF)POF4-621$$a621 - Accelerator Research and Development (POF4-621)$$cPOF4-621$$fPOF IV$$x0
000640169 536__ $$0G:(DE-HGF)POF4-6G2$$a6G2 - FLASH (DESY) (POF4-6G2)$$cPOF4-6G2$$fPOF IV$$x1
000640169 693__ $$0EXP:(DE-H253)F-FL21-20211112$$1EXP:(DE-H253)FLASHII-20150901$$6EXP:(DE-H253)F-FL21-20211112$$aFLASH2$$fFLASH2 Beamline FL21$$x0
000640169 7001_ $$0P:(DE-H253)PIP1005343$$aFruehling, Ulrike$$b1$$eThesis advisor$$udesy
000640169 7001_ $$0P:(DE-H253)PIP1002687$$aDuesterer, Stefan$$b2$$eThesis advisor$$udesy
000640169 8564_ $$uhttps://bib-pubdb1.desy.de/record/640169/files/Mahdi%20Bidhendi%20dissertation.pdf$$yOpenAccess
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000640169 9101_ $$0I:(DE-588b)2008985-5$$6P:(DE-H253)PIP1005343$$aDeutsches Elektronen-Synchrotron$$b1$$kDESY
000640169 9101_ $$0I:(DE-588b)2008985-5$$6P:(DE-H253)PIP1002687$$aDeutsches Elektronen-Synchrotron$$b2$$kDESY
000640169 9101_ $$0I:(DE-588)1043621512$$6P:(DE-H253)PIP1002687$$aEuropean XFEL$$b2$$kXFEL.EU
000640169 9131_ $$0G:(DE-HGF)POF4-621$$1G:(DE-HGF)POF4-620$$2G:(DE-HGF)POF4-600$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$aDE-HGF$$bForschungsbereich Materie$$lMaterie und Technologie$$vAccelerator Research and Development$$x0
000640169 9131_ $$0G:(DE-HGF)POF4-6G2$$1G:(DE-HGF)POF4-6G0$$2G:(DE-HGF)POF4-600$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$aDE-HGF$$bForschungsbereich Materie$$lGroßgeräte: Materie$$vFLASH (DESY)$$x1
000640169 9141_ $$y2025
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000640169 9201_ $$0I:(DE-H253)FS-FLASH-D-20160930$$kFS-FLASH-D$$lFLASH Photonen-Diagnose und Steuerungen$$x0
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