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Multi-Grid detector for neutron spectroscopy : Results obtained on time-of-flight spectrometer CNCS

Anastasopoulos, Michail; Bebb, R.; Berry, K.; Birch, J.; Bryś, T.; Buffet, J-C; Clergeau, J-F; Deen, P. P. LU ; Ehlers, G. and van Esch, P., et al. (2017) In Journal of Instrumentation 12(4).
Abstract

The Multi-Grid detector technology has evolved from the proof-of-principle and characterisation stages. Here we report on the performance of the Multi-Grid detector, the MG.CNCS prototype, which has been installed and tested at the Cold Neutron Chopper Spectrometer, CNCS at SNS. This has allowed a side-by-side comparison to the performance of 3He detectors on an operational instrument. The demonstrator has an active area of 0.2 m2. It is specifically tailored to the specifications of CNCS. The detector was installed in June 2016 and has operated since then, collecting neutron scattering data in parallel to the He-3 detectors of CNCS. In this paper, we present a comprehensive analysis of this data, in particular on... (More)

The Multi-Grid detector technology has evolved from the proof-of-principle and characterisation stages. Here we report on the performance of the Multi-Grid detector, the MG.CNCS prototype, which has been installed and tested at the Cold Neutron Chopper Spectrometer, CNCS at SNS. This has allowed a side-by-side comparison to the performance of 3He detectors on an operational instrument. The demonstrator has an active area of 0.2 m2. It is specifically tailored to the specifications of CNCS. The detector was installed in June 2016 and has operated since then, collecting neutron scattering data in parallel to the He-3 detectors of CNCS. In this paper, we present a comprehensive analysis of this data, in particular on instrument energy resolution, rate capability, background and relative efficiency. Stability, gamma-ray and fast neutron sensitivity have also been investigated. The effect of scattering in the detector components has been measured and provides input to comparison for Monte Carlo simulations. All data is presented in comparison to that measured by the 3He detectors simultaneously, showing that all features recorded by one detector are also recorded by the other. The energy resolution matches closely. We find that the Multi-Grid is able to match the data collected by 3He, and see an indication of a considerable advantage in the count rate capability. Based on these results, we are confident that the Multi-Grid detector will be capable of producing high quality scientific data on chopper spectrometers utilising the unprecedented neutron flux of the ESS.

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published
subject
keywords
Gaseous detectors, Instrumentation for neutron sources, Neutron detectors (cold, thermal, fast neutrons)
in
Journal of Instrumentation
volume
12
issue
4
publisher
IOP Publishing
external identifiers
  • scopus:85019057332
ISSN
1748-0221
DOI
10.1088/1748-0221/12/04/P04030
language
English
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yes
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1fbdacc1-3c89-4dd0-9c48-8def26ed9427
date added to LUP
2017-06-01 08:41:24
date last changed
2017-06-01 08:41:24
@article{1fbdacc1-3c89-4dd0-9c48-8def26ed9427,
  abstract     = {<p>The Multi-Grid detector technology has evolved from the proof-of-principle and characterisation stages. Here we report on the performance of the Multi-Grid detector, the MG.CNCS prototype, which has been installed and tested at the Cold Neutron Chopper Spectrometer, CNCS at SNS. This has allowed a side-by-side comparison to the performance of <sup>3</sup>He detectors on an operational instrument. The demonstrator has an active area of 0.2 m<sup>2</sup>. It is specifically tailored to the specifications of CNCS. The detector was installed in June 2016 and has operated since then, collecting neutron scattering data in parallel to the He-3 detectors of CNCS. In this paper, we present a comprehensive analysis of this data, in particular on instrument energy resolution, rate capability, background and relative efficiency. Stability, gamma-ray and fast neutron sensitivity have also been investigated. The effect of scattering in the detector components has been measured and provides input to comparison for Monte Carlo simulations. All data is presented in comparison to that measured by the <sup>3</sup>He detectors simultaneously, showing that all features recorded by one detector are also recorded by the other. The energy resolution matches closely. We find that the Multi-Grid is able to match the data collected by <sup>3</sup>He, and see an indication of a considerable advantage in the count rate capability. Based on these results, we are confident that the Multi-Grid detector will be capable of producing high quality scientific data on chopper spectrometers utilising the unprecedented neutron flux of the ESS.</p>},
  articleno    = {P04030},
  author       = {Anastasopoulos, Michail and Bebb, R. and Berry, K. and Birch, J. and Bryś, T. and Buffet, J-C and Clergeau, J-F and Deen, P. P. and Ehlers, G. and van Esch, P. and Everett, S. M. and Guerard, B. and Hall-Wilton, R. and Herwig, K. and Hultman, L and Höglund, C. and Iruretagoiena, I. and Issa, F. and Jensen, J. and Khaplanov, A. and Kirstein, O. and Lopez Higuera, I. and Piscitelli, F. and Robinson, E. L. and Schmidt, S and Stefanescu, I},
  issn         = {1748-0221},
  keyword      = {Gaseous detectors,Instrumentation for neutron sources,Neutron detectors (cold, thermal, fast neutrons)},
  language     = {eng},
  month        = {04},
  number       = {4},
  publisher    = {IOP Publishing},
  series       = {Journal of Instrumentation},
  title        = {Multi-Grid detector for neutron spectroscopy : Results obtained on time-of-flight spectrometer CNCS},
  url          = {http://dx.doi.org/10.1088/1748-0221/12/04/P04030},
  volume       = {12},
  year         = {2017},
}