Scattered neutron background in thermal neutron detectors

E. Dian; K. Kanaki; G. Ehlers; R. J. Hall-Wilton; A. Khaplanov; T. Kittelmann; P. Zagyvai

doi:10.1016/j.nima.2018.04.055

Scattered neutron background in thermal neutron detectors

E. Dian, K. Kanaki, G. Ehlers, R. J. Hall-Wilton, A. Khaplanov, T. Kittelmann, P. Zagyvai

Neutron Technologies Division

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Inelastic neutron scattering instruments require very low background; therefore the proper shielding for suppressing the scattered neutron background, both from elastic and inelastic scattering is essential. The detailed understanding of the background scattering sources is required for effective suppression. The Multi-Grid thermal neutron detector is an Ar/CO₂ gas filled detector with a ¹⁰B₄C neutron converter coated on aluminium substrates. It is a large-area detector design that will equip inelastic neutron spectrometers at the European Spallation Source (ESS). To this end a parameterised Geant4 model is built for the Multi-Grid detector. This is the first time thermal neutron scattering background sources have been modelled in a detailed simulation of detector response. The model is validated via comparison with measured data of prototypes installed on the IN6 instrument at ILL and on the CNCS instrument at SNS. The effect of scattering originating in detector components is smaller than effects originating elsewhere.

Original language	English
Pages (from-to)	173-183
Number of pages	11
Journal	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume	902
DOIs	https://doi.org/10.1016/j.nima.2018.04.055
State	Published - Sep 11 2018

Funding

This work has been supported by the In-Kind collaboration between ESS ERIC (contract number: NIK5.4 #5 [ESS]) and the Hungarian Academy of Sciences , Centre for Energy Research (MTA EK) . Richard Hall-Wilton, Anton Khaplanov and Thomas Kittelmann would like to acknowledge support from the EU Horizon2020 Brightness Grant [grant number 676548] . The authors would like to acknowledge the ILL and the SNS for the measured data. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. CNCS data was measured at SNS under ID IPTS-17219. Computing resources provided by DMSC Computing Centre ( https://europeanspallationsource.se/data-management-software/computing-centre ). This work has been supported by the In-Kind collaboration between ESS ERIC (contract number: NIK5.4 #5 [ESS]) and the Hungarian Academy of Sciences, Centre for Energy Research (MTA EK). Richard Hall-Wilton, Anton Khaplanov and Thomas Kittelmann would like to acknowledge support from the EU Horizon2020 Brightness Grant [grant number 676548]. The authors would like to acknowledge the ILL and the SNS for the measured data. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. CNCS data was measured at SNS under ID IPTS-17219. Computing resources provided by DMSC Computing Centre (https://europeanspallationsource.se/data-management-software/computing-centre).

Funders	Funder number
ESS
ESS ERIC
EU Horizon2020
Hungarian Academy of Sciences , Centre for Energy Research
MTA EK
Horizon 2020 Framework Programme	676548
Magyar Tudományos Akadémia

Keywords

ESS
Geant4
Monte Carlo simulation
Neutron detector
Neutron scattering
Validation

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title = "Scattered neutron background in thermal neutron detectors",

abstract = "Inelastic neutron scattering instruments require very low background; therefore the proper shielding for suppressing the scattered neutron background, both from elastic and inelastic scattering is essential. The detailed understanding of the background scattering sources is required for effective suppression. The Multi-Grid thermal neutron detector is an Ar/CO2 gas filled detector with a 10B4C neutron converter coated on aluminium substrates. It is a large-area detector design that will equip inelastic neutron spectrometers at the European Spallation Source (ESS). To this end a parameterised Geant4 model is built for the Multi-Grid detector. This is the first time thermal neutron scattering background sources have been modelled in a detailed simulation of detector response. The model is validated via comparison with measured data of prototypes installed on the IN6 instrument at ILL and on the CNCS instrument at SNS. The effect of scattering originating in detector components is smaller than effects originating elsewhere.",

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author = "E. Dian and K. Kanaki and G. Ehlers and Hall-Wilton, {R. J.} and A. Khaplanov and T. Kittelmann and P. Zagyvai",

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AU - Dian, E.

AU - Kanaki, K.

AU - Ehlers, G.

AU - Hall-Wilton, R. J.

AU - Khaplanov, A.

AU - Kittelmann, T.

AU - Zagyvai, P.

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N2 - Inelastic neutron scattering instruments require very low background; therefore the proper shielding for suppressing the scattered neutron background, both from elastic and inelastic scattering is essential. The detailed understanding of the background scattering sources is required for effective suppression. The Multi-Grid thermal neutron detector is an Ar/CO2 gas filled detector with a 10B4C neutron converter coated on aluminium substrates. It is a large-area detector design that will equip inelastic neutron spectrometers at the European Spallation Source (ESS). To this end a parameterised Geant4 model is built for the Multi-Grid detector. This is the first time thermal neutron scattering background sources have been modelled in a detailed simulation of detector response. The model is validated via comparison with measured data of prototypes installed on the IN6 instrument at ILL and on the CNCS instrument at SNS. The effect of scattering originating in detector components is smaller than effects originating elsewhere.

AB - Inelastic neutron scattering instruments require very low background; therefore the proper shielding for suppressing the scattered neutron background, both from elastic and inelastic scattering is essential. The detailed understanding of the background scattering sources is required for effective suppression. The Multi-Grid thermal neutron detector is an Ar/CO2 gas filled detector with a 10B4C neutron converter coated on aluminium substrates. It is a large-area detector design that will equip inelastic neutron spectrometers at the European Spallation Source (ESS). To this end a parameterised Geant4 model is built for the Multi-Grid detector. This is the first time thermal neutron scattering background sources have been modelled in a detailed simulation of detector response. The model is validated via comparison with measured data of prototypes installed on the IN6 instrument at ILL and on the CNCS instrument at SNS. The effect of scattering originating in detector components is smaller than effects originating elsewhere.

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JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

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ER -

Scattered neutron background in thermal neutron detectors

Abstract

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