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A design study of VOR: A versatile optimal resolution chopper spectrometer for the ESS

Deen, Pascale LU ; Vickery, A.; Andersen, Ken LU and Hall-Wilton, Richard LU (2015) 11th International Conference on Quasielastic Neutron Scattering / 6th International Workshop on Inelastic Neutron Spectrometers (QENS/WINS) In QENS/WINS 2014 - 11th International Conference on Quasielastic Neutron Scattering and 6th International Workshopon Inelastic Neutron Spectrometers 83. p.03002-03002
Abstract
VOR, the versatile optimal resolution chopper spectrometer, is designed to probe dynamic phenomena that are currently inaccessible for inelastic neutron scattering due to flux limitations. VOR is a short instrument by the standards of the European Spallation Source (ESS), 30.2m moderator to sample, and provides instantaneous access to a broad dynamic range, 1-120 meV within each ESS period. The short instrument length combined with the long ESS pulse width enables a quadratic flux increase, even at longer wavelengths, by relaxing energy resolution from Delta E/E = 1% up to Delta E/E = 7%. This is impossible both on a long chopper spectrometer at the ESS and with instruments at short pulsed sources. In comparison to current day chopper... (More)
VOR, the versatile optimal resolution chopper spectrometer, is designed to probe dynamic phenomena that are currently inaccessible for inelastic neutron scattering due to flux limitations. VOR is a short instrument by the standards of the European Spallation Source (ESS), 30.2m moderator to sample, and provides instantaneous access to a broad dynamic range, 1-120 meV within each ESS period. The short instrument length combined with the long ESS pulse width enables a quadratic flux increase, even at longer wavelengths, by relaxing energy resolution from Delta E/E = 1% up to Delta E/E = 7%. This is impossible both on a long chopper spectrometer at the ESS and with instruments at short pulsed sources. In comparison to current day chopper spectrometers, VOR can offer an order of magnitude improvement in flux for equivalent energy resolutions, Delta E/E = 1-3%. Further relaxing the energy resolution enables VOR to gain an extra order of magnitude in flux. In addition, VOR has been optimised for repetition rate multiplication (RRM) and is therefore able to measure, in a single ESS period, 6-14 incident wavelengths, across a wavelength band of 9 angstrom with a novel chopper configuration that transmits all incident wavelengths with equivalent counting statistics. The characteristics of VOR make it a unique instrument with capabilities to access small, limited-lifetime samples and transient phenomena with inelastic neutron scattering. (Less)
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author
organization
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Chapter in Book/Report/Conference proceeding
publication status
published
subject
in
QENS/WINS 2014 - 11th International Conference on Quasielastic Neutron Scattering and 6th International Workshopon Inelastic Neutron Spectrometers
volume
83
pages
03002 - 03002
publisher
EDP Sciences
conference name
11th International Conference on Quasielastic Neutron Scattering / 6th International Workshop on Inelastic Neutron Spectrometers (QENS/WINS)
external identifiers
  • wos:000351844900023
  • scopus:84921731934
ISSN
2101-6275
2100-014X
DOI
10.1051/epjconf/20158303002
language
English
LU publication?
yes
id
2894571a-7239-43a8-a4a8-83814e32dad0 (old id 5281676)
date added to LUP
2015-04-24 11:43:12
date last changed
2017-07-23 03:25:39
@inproceedings{2894571a-7239-43a8-a4a8-83814e32dad0,
  abstract     = {VOR, the versatile optimal resolution chopper spectrometer, is designed to probe dynamic phenomena that are currently inaccessible for inelastic neutron scattering due to flux limitations. VOR is a short instrument by the standards of the European Spallation Source (ESS), 30.2m moderator to sample, and provides instantaneous access to a broad dynamic range, 1-120 meV within each ESS period. The short instrument length combined with the long ESS pulse width enables a quadratic flux increase, even at longer wavelengths, by relaxing energy resolution from Delta E/E = 1% up to Delta E/E = 7%. This is impossible both on a long chopper spectrometer at the ESS and with instruments at short pulsed sources. In comparison to current day chopper spectrometers, VOR can offer an order of magnitude improvement in flux for equivalent energy resolutions, Delta E/E = 1-3%. Further relaxing the energy resolution enables VOR to gain an extra order of magnitude in flux. In addition, VOR has been optimised for repetition rate multiplication (RRM) and is therefore able to measure, in a single ESS period, 6-14 incident wavelengths, across a wavelength band of 9 angstrom with a novel chopper configuration that transmits all incident wavelengths with equivalent counting statistics. The characteristics of VOR make it a unique instrument with capabilities to access small, limited-lifetime samples and transient phenomena with inelastic neutron scattering.},
  author       = {Deen, Pascale and Vickery, A. and Andersen, Ken and Hall-Wilton, Richard},
  booktitle    = {QENS/WINS 2014 - 11th International Conference on Quasielastic Neutron Scattering and 6th International Workshopon Inelastic Neutron Spectrometers},
  issn         = {2101-6275},
  language     = {eng},
  pages        = {03002--03002},
  publisher    = {EDP Sciences},
  title        = {A design study of VOR: A versatile optimal resolution chopper spectrometer for the ESS},
  url          = {http://dx.doi.org/10.1051/epjconf/20158303002},
  volume       = {83},
  year         = {2015},
}