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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 9: Beam Dynamics I

AKBP 9.1: Vortrag

Mittwoch, 22. März 2023, 15:45–16:00, CHE/0184

A Simulation for Ultrafast Electron Scattering Applications — •Simon Barg — Helmholtz-Zentrum Berlin

The superconducting radio-frequency (SRF) photoinjector is a photoelectron driven linear accelerator located at the SEALab facility at Helmholtz-Zentrum Berlin. With the injector, very flexible beam parameters can be achieved enabling many scientific applications like performing ultrafast electron scattering, with diffraction and imaging modalities, which is this work's focus. Complex structures such as biological molecules, which are not suitable for conventional crystallographic methods, could be imaged and studied with this technique.

To assess the feasibility of ultrafast imaging, a numerical simulation is developed to model an electron pulse from the gun that is deflected by a stream of molecules running perpendicular to the pulse's path to then create a (motion-) blurred image of an individual particle after passing through a magnetic lens system. Considering the injector's spatial coherence, this work's first goal is to find optimal imaging conditions to differentiate between two molecule orientations.

After showing that a contrast between different images can be successfully obtained, the simulation is currently being refined to work as a tool for parameter optimization. Given the pulse features, the model is able to output suitable lens settings. It is also used to compare different techniques, such as dark and bright field imaging, with the overall goal to find the most promising setups for future experiments.