Dresden 2026 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 8: Poster AKBP
AKBP 8.6: Poster
Mittwoch, 11. März 2026, 09:30–11:00, P4
MeV-UED: An instrument for experiments on the atomic scale in space and time — Jakob Krämer1, Verena Kümper1, Moritz Pfeiffer1, 2, •Christoph Quitmann1, and Ariane Ufer1,2 — 1RI Research Instruments GmbH Friedrich-Ebert-Str. 75 51429 Bergisch Gladbach — 2III. Physikalisches Institut B, RWTH Aachen, 52056 Aachen
Current research focuses on investigating promising materials that are potential candidates for applications as nano, quantum and energy technologies. For these kind of materials information about static atomic structures and how they change in time is of crucial importance. Such changes happen upon absorption of energy, during chemical reactions, or in phase transitions. In order to observe these changes, it is necessary to measure atomic positions with sub-Å spatial and sub-ps temporal resolution. RF-Photocathodes excited with ultra-short laser pulses allow generation of electron pulses with MeV energies. Such pulses can be used for diffraction experiments where they create Bragg peaks with ca. mrad angles.
We introduce a commercial robust MeV-UED instrument aimed at ultra-fast electron diffraction with 100fs temporal and sub Å spatial resolution based on a 2.5-cell warm RF-gun and a commercial Ti:Sa laser. This instrument is compatible with solid , liquid or gaseous samples (incl. cryogenic option). We present the main design considerations, electron beam dynamics simulations, and the engineering design of the RI-Bornite MeV-UED instrument.
Keywords: Ultra-fast electron diffraction; Pump-probe experiments; RF-Photogun; Beam dynamics