Speaker
Description
Current research in quantum, nano, and energy materials requires information about material structure on the atomic scale in space and time. These materials show a variety of ultra-fast phenomena such as light absorption, structural changes, phase transitions, thermal or non-thermal melting, all of which happen on the ps or sub-ps scale and involve position changes on the Ångström scale.
In this contribution we present the conceptual design for the RI-Bornite instrument, which allows ultra-fast electron diffraction using Mega-electron-volt electron beams (MeV-UED). For this instrument we use a warm (copper) 2.5-cell RF-photogun with a replaceable Cu photocathode. A single Ti:Sa fs-laser system drives both the pump beam (266 nm, ca. 1 µJ) and the probe beam (800 nm, several mJ/pulse). The system is designed to reliably reach 100 fs temporal resolution.
The current sample chamber is optimized for solid-state samples and includes the option for sample cooling and a load-lock. Future versions shall allow experiments on liquid or gaseous samples.
We present the main design considerations, electron beam dynamics simulations, and the engineering design.
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