Our instrument provides a setup to study next-generation field emission electron sources for scanning and transmission electron microscopy, spectroscopy, quantum information science, and quantum sensing at variable temperatures down to 4 K. The ultrahigh vacuum setup includes a closed cycle liquid-helium cryostat for e.g. superconducting emitter applications, a high resolution (3 meV) electron energy analyzer, a Faraday cup with a pico-amperemeter for beam current measurement, and a single electron delay line detector for spatial and temporal detection and correlation analysis in the nanosecond regime. It includes also a mass spectrometer gas analyzer, a high-voltage einzel-lens for beam magnification, optical access for laser excitation, and an installation to introduce gases. Currently, we establish an electron interferometer for coherence analysis. We also apply techniques for nanotip etching and ion milling in cooperation with NCEM.
The instrument can study novel correlated, coherent electron sources with ultralow energy distribution such as predicted e.g. for superconducting niobium nanotips.
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