Momentum spectrometer for electron-electron coincidence studies on superconductors

Journal Article · Mon Oct 15 00:00:00 EDT 2012 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4754470· OSTI ID:22093790

Wallauer, Robert; Voss, Stefan; Bauer, Tobias; Schneider, Deborah; Titze, Jasmin; Ulrich, Birte; Kreidi, Katharina; Neumann, Nadine; Havermeier, Tilo; Schoeffler, Markus; Jahnke, Till; Czasch, Achim; Schmidt, Lothar; Schmidt-Boecking, Horst; Doerner, Reinhard ^[1]; Foucar, Lutz ^[2]; Kanigel, Amit ^[3]; Campuzano, Juan Carlos ^[4]; Jeschke, Harald; Valenti, Roser ^[5] ; others, and

---

1. Institut fuer Kernphysik, Universitaet Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt/Main (Germany)
2. Max Planck Advanced Study Group, Center for Free Electron Laser Science (CFEL), Notkestrasse 85, 22607 Hamburg (Germany)
3. Technion, Technion City, 32000 Haifa (Israel)
4. University of Illinois at Chicago, 601 S. Morgan St., Chicago, Illinois 60607 (United States)
5. Institut fuer Theoretische Physik, Universitaet Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt/Main (Germany)

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 {pi} 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.

• OSTI ID: 22093790
• Journal Information: Review of Scientific Instruments, Vol. 83, Issue 10; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
ALGORITHMS
ANALOG-TO-DIGITAL CONVERTERS
CLEANING
CONVERSION
DEAD TIME
ELECTRON SPECTROMETERS
MICROCHANNEL ELECTRON MULTIPLIERS
POSITION SENSITIVE DETECTORS
READOUT SYSTEMS
SAMPLE HOLDERS
SOLIDS
SUPERCONDUCTORS
TEMPERATURE RANGE 0000-0013 K