VESPA: The vibrational spectrometer for the European Spallation Source

Research output: Contribution to journalArticle


VESPA, Vibrational Excitation Spectrometer with Pyrolytic-graphite Analysers, aims to probe molecular excitations via inelastic neutron scattering. It is a thermal high resolution inverted geometry time-of-flight instrument designed to maximise the use of the long pulse of the European Spallation Source. The wavelength frame multiplication technique was applied to provide simultaneously a broad dynamic range (about 0-500 meV) while a system of optical blind choppers allows to trade flux for energy resolution. Thanks to its high flux, VESPA will allow the investigation of dynamical and in situ experiments in physical chemistry. Here we describe the design parameters and the corresponding McStas simulations.


  • Anna Fedrigo
  • Daniele Colognesi
  • Mads Bertelsen
  • Monika Hartl
  • Kim Lefmann
  • Pascale P. Deen
  • Markus Strobl
  • Francesco Grazzi
  • Marco Zoppi
External organisations
  • University of Copenhagen
  • CNR Institute for Complex Systems (CNR-ISC)
  • European Spallation Source ESS AB
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Accelerator Physics and Instrumentation
Original languageEnglish
Article number065101
JournalReview of Scientific Instruments
Issue number6
Publication statusPublished - 2016 Jun 1
Publication categoryResearch