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Journal Article

Momentum spectrometer for electron-electron coincidence studies on superconductors


Foucar,  Lutz
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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Wallauer, R., Voss, S., Foucar, L., Bauer, T., Schneider, D., Titze, J., et al. (2012). Momentum spectrometer for electron-electron coincidence studies on superconductors. Review of Scientific Instruments, 83(10): 103905, pp. 1-7. doi:10.1063/1.4754470.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-BD51-7
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.