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| Master Thesis | PUBDB-2020-03615 |
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2020
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Please use a persistent id in citations: doi:10.3204/PUBDB-2020-03615
Abstract: In this thesis a method for electron beam slice diagnostic has been developed.The method is applicable to the drive beam of high-gain FELs operating in seededor SASE mode.It is essentially a time-resolved electron beam parameter estimationbased on experimental data on both projected and time-resolved beam propertiesand a theoretical model implemented in a numerical FEL-simulation code.This approach allows to take into account many independent measurements onelectron bunch (e.g. emittance, energy spread, current), electron optical functions,FEL-amplifier (gain length), and FEL-output radiation(wavelength, power) and deducevarious otherwise experimentally inaccessible quantities like slice parameters,initial bunching, or induced energy modulation. Furthermore the theoretical modelimplemented in the numerical code might be of arbitrary complexity as required totake account of different relevant effects like 3D-effects, variation of electron beamparameters etc..The diagnostic method has been applied at sFLASH, an experiment for High-Gain Harmonic Generation (HGHG) at the free-electron laser facility FLASH, inHamburg. The initial bunching in the seeded electron bunch was found to be $b$ =(0.46 ± 0.04) %, the normalized slice emittance $ε_n$ = (0.73 ± 0.34) μmrad and theenergy modulation induced by the seed laser $ΔE_{mod}$ = (227 ± 49) keV.
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