VESPA: The vibrational spectrometer for the European Spallation Source

Journal Article · Wed Jun 15 00:00:00 EDT 2016 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.4952430· OSTI ID:22597988

Fedrigo, Anna ^[1]; Colognesi, Daniele; Grazzi, Francesco; Zoppi, Marco ^[2]; Bertelsen, Mads; Strobl, Markus ^[1]; Hartl, Monika; Deen, Pascale P. ^[3]; Lefmann, Kim ^[1]

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1. Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen Ø (Denmark)
2. Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, 50019 Sesto Fiorentino (Italy)
3. European Spallation Source ESS AB, SE-221 00 Lund (Sweden)

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.

• OSTI ID: 22597988
• Journal Information: Review of Scientific Instruments, Vol. 87, Issue 6; Other Information: (c) 2016 Author(s); 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
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DESIGN
ENERGY RESOLUTION
EUROPEAN SPALLATION SOURCE
EXCITATION
GEOMETRY
GRAPHITE
INELASTIC SCATTERING
MEV RANGE 100-1000
NEUTRON DIFFRACTION
NEUTRON REACTIONS
NEUTRONS
PHYSICAL CHEMISTRY
PULSES
SPALLATION
SPECTROMETERS
TIME-OF-FLIGHT METHOD
WAVELENGTHS