SMuK 2023 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 4: X-Ray Lasers
K 4.2: Vortrag
Mittwoch, 22. März 2023, 11:15–11:30, HSZ/0403
Angular streaking TOF spectrometer for ultrafast FEL pulse characterization — •Sara Savio1, Niclas Wieland1, Lars Funke1, Lasse Wülfing1, Arne Held1, Markus Ilchen2, and Wolfram Helml1 — 1Fakultät Physik, Technische Universität Dortmund, Maria-Göppert-Mayer-Straße 2, 44227 Dortmund, Germany — 2Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
Angular Streaking is a very successful and currently the only non-invasive tool used to measure the time-energy structure of X-ray pulses with sub-femtosecond resolution. A complete reconstruction of the ultrashort FEL pulses can be realized from the angle-resolved photoelectron momentum distribution due to the energy modulation by a circularly polarized optical laser. This work mainly evaluates the performance parameter like solid angle acceptance of the electron Time-of-Flight (eTOF) spectrometer with the help of SIMION software. A systematic investigation of the overall transmission and energy resolution while considering the pointing (displacement) of the beam in the interaction region is carried out using the charged particle optical simulation. Angle resolving photoelectron spectrometer is a potential candidate for polarization and short pulse measurements. The scope of the envisioned electron spectroscopy experiments is not only limited to pulse characterization but also includes measurements of ultrafast electron dynamics in gas-phase atoms, like the Auger-Meitner decay, and following electronic pathways in more complex molecules for ultrafast movies of photochemical reactions.