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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 4: Beam Dynamics I

AKBP 4.3: Vortrag

Montag, 18. März 2024, 17:30–17:45, E 020

A Simulation of Ultrafast Electron Scattering Applications — •Simon Barg — Helmholtz-Zentrum Berlin für Materialen und Energie, Berlin, Germany

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, procedures and code libraries from electron microscopy (EM) are used and extended with the overall goal to provide a full numerical simulation for proposed liquid state experiments incorporating every step of the electrons' path: the emission from the gun, the deflection due to the interaction with a perpendicular stream of molecules and the aberrations created by the magnetic lens system.

A Python toolkit is build, which simplifies applying the simulation and thereby helps answering some of the experiment's key design questions: It allows the comparison of different modalities like dark and bright field imaging. It can also be used for optimizing the lens setup, or beam parameters. Additionally, it supports coherency studies and stroboscopic imaging to extensively and precisely explore different options for the future experiments at SEALab.

Keywords: ultrafast; electron diffraction; imaging; SRF photoinjector; liquid state