Alberdi-Esuain, B.; Kamps, T.: Electron optics based on quadrupole multiplets for dark field imaging and diffraction with MeV electron beams. In: Ralph Assmann [Ed.] : IPAC'23 : Proceedings of the 14th International Particle Accelerator Conference ; Venice, Italy from 7 to 12 May 2023Geneve: JACoW, 2023. - ISBN 978-3-95450-231-8, p. TUPL124/1-4
Open Access Version
Abstract:
Ultrafast electron probing techniques offer unique experimental tools for investigating the tructural dynamics of ultrafast photo-induced processes in molecular and condensed phase systems. In this work, we propose using the SEALAB Photoinjector’s exceptional and versatile electron beam parameters to develop a state-of-the-art facility for ultrafast electron diffraction and imaging (UED and UEI) experiments with high sensitivity in space, energy, and time. We first address the design of an electron lens based on quadrupoles that enables easy switching between diffraction and direct imaging modes with minimal system changes. We compare the performance of the quadrupole-based lens with a simpler solenoid-based lens with similar functionality by calculating their respective aberration coefficients. Furthermore, we introduce the necessary beam-line modifications for enabling dark field imaging in the SEALAB Photoinjector. This development is crucial to achieve high-resolution imaging and enable the study of a wide range of material systems.