A simulational study of the indirect-geometry neutron spectrometer BIFROST at the European Spallation Source, from neutron source position to detector position
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A simulational study of the indirect-geometry neutron spectrometer BIFROST at the European Spallation Source, from neutron source position to detector position. / Klausz, M.; Kanaki, K.; Kittelmann, T.; Toft-Petersen, R.; Birk, J. O.; Olsen, Martin Andreas; Zagyvai, P.; Hall-Wilton, R. J.
I: Journal of Applied Crystallography, Bind 54, 02.2021, s. 263-279.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - A simulational study of the indirect-geometry neutron spectrometer BIFROST at the European Spallation Source, from neutron source position to detector position
AU - Klausz, M.
AU - Kanaki, K.
AU - Kittelmann, T.
AU - Toft-Petersen, R.
AU - Birk, J. O.
AU - Olsen, Martin Andreas
AU - Zagyvai, P.
AU - Hall-Wilton, R. J.
PY - 2021/2
Y1 - 2021/2
N2 - The European Spallation Source (ESS) is intended to become the most powerful spallation neutron source in the world and the flagship of neutron science in upcoming decades. The exceptionally high neutron flux will provide unique opportunities for scientific experiments but also set high requirements for the detectors. One of the most challenging aspects is the rate capability and in particular the peak instantaneous rate capability, i.e. the number of neutrons hitting the detector per channel or cm(2) at the peak of the neutron pulse. The primary purpose of this paper is to estimate the incident rates that are anticipated for the BIFROST instrument planned for ESS, and also to demonstrate the use of powerful simulation tools for the correct interpretation of neutron transport in crystalline materials. A full simulation model of the instrument from source to detector position, implemented with the use of multiple simulation software packages, is presented. For a single detector tube, instantaneous incident rates with a maximum of 1.7 GHz for a Bragg peak from a single crystal and 0.3 MHz for a vanadium sample are found. This paper also includes the first application of a new pyrolytic graphite model and a comparison of different simulation tools to highlight their strengths and weaknesses.
AB - The European Spallation Source (ESS) is intended to become the most powerful spallation neutron source in the world and the flagship of neutron science in upcoming decades. The exceptionally high neutron flux will provide unique opportunities for scientific experiments but also set high requirements for the detectors. One of the most challenging aspects is the rate capability and in particular the peak instantaneous rate capability, i.e. the number of neutrons hitting the detector per channel or cm(2) at the peak of the neutron pulse. The primary purpose of this paper is to estimate the incident rates that are anticipated for the BIFROST instrument planned for ESS, and also to demonstrate the use of powerful simulation tools for the correct interpretation of neutron transport in crystalline materials. A full simulation model of the instrument from source to detector position, implemented with the use of multiple simulation software packages, is presented. For a single detector tube, instantaneous incident rates with a maximum of 1.7 GHz for a Bragg peak from a single crystal and 0.3 MHz for a vanadium sample are found. This paper also includes the first application of a new pyrolytic graphite model and a comparison of different simulation tools to highlight their strengths and weaknesses.
KW - Geant4
KW - McStas
KW - neutron detectors
KW - neutron spectroscopy
U2 - 10.1107/S1600576720016192
DO - 10.1107/S1600576720016192
M3 - Journal article
C2 - 33833652
VL - 54
SP - 263
EP - 279
JO - Journal of Applied Crystallography
JF - Journal of Applied Crystallography
SN - 0021-8898
ER -
ID: 258273207