Momentum spectrometer for electron-electron coincidence studies on superconductors

Robert Wallauer, Stefan Voss, Lutz Foucar, Tobias Bauer, Deborah Schneider, Jasmin Titze, Birte Ulrich, Katharina Kreidi, Nadine Neumann, Tilo Havermeier, Markus Schöffler, Till Jahnke, Achim Czasch, Lothar Schmidt, Amit Kanigel, Juan Carlos Campuzano, Harald Olaf Jeschke, Roser Valenti, Andreas Müller, Götz BernerMichael Sing, Ralph Claessen, Horst Schmidt-Böcking, Reinhard Dörner

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Abstract

We present a new experimental setup to study electron-electron coincidences from superconducting surfaces. In our approach, electrons emitted from a surface are projected onto a time- and position-sensitive microchannel plate detector with delayline position readout. Electrons that are emitted within 2 π solid angle with respect to the surface are detected in coincidence. The detector used is a hexagonal delayline detector with enhanced multiple hit capabilities. It is read out with a Flash analog-to-digital converter. The three-dimensional momentum vector is obtained for each electron. The intrinsic dead time of the detector has been greatly reduced by implementing a new algorithm for pulse analysis. The sample holder has been matched to fit the spectrometer while being capable of cooling down the sample to 4.5 K during the measurement and heating it up to 420 K for the cleaning procedure.

Original languageEnglish
Article number103905
JournalReview of Scientific Instruments
Volume83
Issue number10
DOIs
Publication statusPublished - Oct 2012
Externally publishedYes

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ASJC Scopus subject areas

  • Instrumentation

Cite this

Wallauer, R., Voss, S., Foucar, L., Bauer, T., Schneider, D., Titze, J., Ulrich, B., Kreidi, K., Neumann, N., Havermeier, T., Schöffler, M., Jahnke, T., Czasch, A., Schmidt, L., Kanigel, A., Campuzano, J. C., Jeschke, H. O., Valenti, R., Müller, A., ... Dörner, R. (2012). Momentum spectrometer for electron-electron coincidence studies on superconductors. Review of Scientific Instruments, 83(10), [103905]. https://doi.org/10.1063/1.4754470