Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 27: Precision Spectroscopy of Atoms and Ions III (joint session A/Q)
A 27.6: Talk
Thursday, March 14, 2024, 12:15–12:30, HS 1010
Electron Optical Systems for High-Resolution Electron Time-of-Flight Spectrometer — •Niclas Wieland1, Lars Funke2, Lasse Wülfing2, Arne Held2, Sara Savio2, Markus Ilchen1, and Wolfram Helml2 — 1Universität Hamburg, Insitut für Experimentalphysik — 2Technische Universität Dortmund, Fakultät Physik
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. Angle-resolving time-of-flight spectrometers can be used to resolve these. The latter devices typically consist of electron optics, a drift section, and a detector. 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-supported 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 using the popular open-source computing platform FEniCSx to further increase the achievable resolution and transmission by applying optimizer-determined voltage sets to our optics. Gaining insight into electron trajectories using precise simulations appears to be an efficient way to improve the overall performance of such experiments-We present our progress in terms of electrode design and applied voltages for a 0-3 keV electron energy spectrum to further develop spectrometer research in this field.
Keywords: FEniCSx; Spectrometer; Attosecond Science; Optimization; Electron optics