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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 4: X-Ray Lasers
K 4.1: Talk
Wednesday, March 22, 2023, 11:00–11:15, HSZ/0403
Electron Optical Systems for High-Resolution Electron Time-of-Flight Spectrometer — •Niclas Wieland1, Sara Savio1, 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 allows resolving the sub-femtosecond temporal structure of SASE free-electron laser pulses. A circularly polarized infrared laser imprints a phase-dependent momentum shift onto the photoelectron spectra of a gas target. Time-of-flight spectrometers can be used to resolve these. The latter devices consist of electron optics, a drift section and a detector with good time resolution. Parameters such as energy resolution and energy-dependent transmission for the whole system can be determined by simulation. In this talk, we present the finalized simulation-motivated spectrometer design used inside our new chamber for the SpeAR_XFEL project. Furthermore, we will introduce the possibility of adaptive electron optics in our spectrometer to further increase the resolution and transmission by applying specific voltage sets to our optics.
Gaining insight into electron motion using precise simulations appears to be an efficient way to improve the overall performance of such experiments. We would like to present our progress in terms of electrode design and applied voltages for a 0-4 keV electron energy spectrum, to further develop spectrometer research in this field.