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Time- And energy-resolved effects in the boron-10 based multi-grid and helium-3 based thermal neutron detectors

Backis, A. ; Khaplanov, A. LU ; Al Jebali, R. ; Ammer, R. ; Apostolidis, I. ; Birch, J. ; Lai, C. C. ; Deen, P. P. LU ; Etxegarai, M. and De Ruette, N. , et al. (2020) In Measurement Science and Technology 32(3).
Abstract

The boron-10 based multi-grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for time-of-flight neutron spectroscopy at cold to thermal neutron energies. The objective of this work is to investigate fine time- and energy-resolved effects of the Multi-Grid detector, down to a few µeV, while comparing it to the performance of a typical helium-3 tube. Furthermore, it is to characterize differences between the detector technologies in terms of internal scattering, as well as the time reconstruction of ∼ µs short neutron pulses. The data were taken at the Helmholtz Zentrum Berlin, where the Multi-Grid detector and a helium-3 tube were installed... (More)

The boron-10 based multi-grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for time-of-flight neutron spectroscopy at cold to thermal neutron energies. The objective of this work is to investigate fine time- and energy-resolved effects of the Multi-Grid detector, down to a few µeV, while comparing it to the performance of a typical helium-3 tube. Furthermore, it is to characterize differences between the detector technologies in terms of internal scattering, as well as the time reconstruction of ∼ µs short neutron pulses. The data were taken at the Helmholtz Zentrum Berlin, where the Multi-Grid detector and a helium-3 tube were installed at the ESS test beamline, V20. Using a Fermi-chopper, the neutron beam of the reactor was chopped into a few tens of µs wide pulses before reaching the detector, located a few tens of cm downstream. The data of the measurements show an agreement between the derived and calculated neutron detection efficiency curve. The data also provide fine details on the effect of internal scattering, and how it can be reduced. For the first time, the chopper resolution was comparable to the timing resolution of the Multi-Grid detector. This allowed a detailed study of time- and energy resolved effects, as well as a comparison with a typical helium-3 tube.

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publishing date
type
Contribution to journal
publication status
published
subject
keywords
boron-10, gaseous detectors, helium-3, multi-grid detector, neutron detectors, time resolution
in
Measurement Science and Technology
volume
32
issue
3
article number
035903
publisher
IOP Publishing
external identifiers
  • scopus:85098267692
ISSN
0957-0233
DOI
10.1088/1361-6501/abc63e
language
English
LU publication?
no
id
b24fbd78-5416-495a-afca-b1558870bc31
date added to LUP
2022-04-04 10:32:49
date last changed
2022-04-27 20:55:59
@article{b24fbd78-5416-495a-afca-b1558870bc31,
  abstract     = {{<p>The boron-10 based multi-grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for time-of-flight neutron spectroscopy at cold to thermal neutron energies. The objective of this work is to investigate fine time- and energy-resolved effects of the Multi-Grid detector, down to a few µeV, while comparing it to the performance of a typical helium-3 tube. Furthermore, it is to characterize differences between the detector technologies in terms of internal scattering, as well as the time reconstruction of ∼ µs short neutron pulses. The data were taken at the Helmholtz Zentrum Berlin, where the Multi-Grid detector and a helium-3 tube were installed at the ESS test beamline, V20. Using a Fermi-chopper, the neutron beam of the reactor was chopped into a few tens of µs wide pulses before reaching the detector, located a few tens of cm downstream. The data of the measurements show an agreement between the derived and calculated neutron detection efficiency curve. The data also provide fine details on the effect of internal scattering, and how it can be reduced. For the first time, the chopper resolution was comparable to the timing resolution of the Multi-Grid detector. This allowed a detailed study of time- and energy resolved effects, as well as a comparison with a typical helium-3 tube. </p>}},
  author       = {{Backis, A. and Khaplanov, A. and Al Jebali, R. and Ammer, R. and Apostolidis, I. and Birch, J. and Lai, C. C. and Deen, P. P. and Etxegarai, M. and De Ruette, N. and Freita Ramos, J. and Förster, D. F. and Haettner, E. and Hall-Wilton, R. and Hamilton, D. and Höglund, C. and Kadletz, P. M. and Kanaki, K. and Karnickis, E. and Kirstein, O. and Kolya, S. and Kraujalyte, Z. and Laloni, A. and Livingston, K. and Löhman, O. and Maulerova, V. and Mauritzon, N. and Müller, F. and Lopez Higuera, I. and Richter, T. and Robinson, L. and Roth, R. and Shetty, M. and Taylor, J. and Woracek, R. and Xiong, W.}},
  issn         = {{0957-0233}},
  keywords     = {{boron-10; gaseous detectors; helium-3; multi-grid detector; neutron detectors; time resolution}},
  language     = {{eng}},
  number       = {{3}},
  publisher    = {{IOP Publishing}},
  series       = {{Measurement Science and Technology}},
  title        = {{Time- And energy-resolved effects in the boron-10 based multi-grid and helium-3 based thermal neutron detectors}},
  url          = {{http://dx.doi.org/10.1088/1361-6501/abc63e}},
  doi          = {{10.1088/1361-6501/abc63e}},
  volume       = {{32}},
  year         = {{2020}},
}