title: Momentum spectrometer for electron-electron coincidence studies on superconductors.
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.
authors.affiliation: Institut für Kernphysik, Universität Frankfurt, Max-von-Laue-Str. 1, 60438 Frankfurt/Main, Germany. wallauer@atom.uni-frankfurt.de
authors.forename: Robert
authors.initials: R
authors.lastname: Wallauer
authors.forename: Stefan
authors.initials: S
authors.lastname: Voss
authors.forename: Lutz
authors.initials: L
authors.lastname: Foucar
authors.forename: Tobias
authors.initials: T
authors.lastname: Bauer
authors.forename: Deborah
authors.initials: D
authors.lastname: Schneider
authors.forename: Jasmin
authors.initials: J
authors.lastname: Titze
authors.forename: Birte
authors.initials: B
authors.lastname: Ulrich
authors.forename: Katharina
authors.initials: K
authors.lastname: Kreidi
authors.forename: Nadine
authors.initials: N
authors.lastname: Neumann
authors.forename: Tilo
authors.initials: T
authors.lastname: Havermeier
authors.forename: Markus
authors.initials: M
authors.lastname: Schöffler
authors.forename: Till
authors.initials: T
authors.lastname: Jahnke
authors.forename: Achim
authors.initials: A
authors.lastname: Czasch
authors.forename: Lothar
authors.initials: L
authors.lastname: Schmidt
authors.forename: Amit
authors.initials: A
authors.lastname: Kanigel
authors.forename: Juan Carlos
authors.initials: JC
authors.lastname: Campuzano
authors.forename: Harald
authors.initials: H
authors.lastname: Jeschke
authors.forename: Roser
authors.initials: R
authors.lastname: Valenti
authors.forename: Andreas
authors.initials: A
authors.lastname: Müller
authors.forename: Götz
authors.initials: G
authors.lastname: Berner
authors.forename: Michael
authors.initials: M
authors.lastname: Sing
authors.forename: Ralph
authors.initials: R
authors.lastname: Claessen
authors.forename: Horst
authors.initials: H
authors.lastname: Schmidt-Böcking
authors.forename: Reinhard
authors.initials: R
authors.lastname: Dörner
mesh_terms: D004553:Electric Conductivity; D004583:Electrons; D061848:Optical Imaging; D013057:Spectrum Analysis / Q000295:instrumentation*