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In-beam background suppression shield

Santoro, V.; Cai, X.; DiJulio, D. D. LU ; Ansell, S. and Bentley, P. M. LU (2015) In Journal of Neutron Research 18(4). p.135-144
Abstract

The long (3 ms) proton pulse of the European Spallation Source (ESS) gives rise to unique and potentially high backgrounds for the instrument suite. In such a source an instrument's capabilities will be limited by its Signal to Noise (S/N) ratio. The instruments with a direct view of the moderator, which do not use a bender to help mitigate the fast neutron background, are the most challenging. For these beam lines we propose the innovative shielding of placing blocks of material directly into the guide system, which allow a minimum attenuation of the cold and thermal fluxes relative to the background suppression. This shielding configuration has been worked into a beam line model using Geant4. We study particularly the advantages of... (More)

The long (3 ms) proton pulse of the European Spallation Source (ESS) gives rise to unique and potentially high backgrounds for the instrument suite. In such a source an instrument's capabilities will be limited by its Signal to Noise (S/N) ratio. The instruments with a direct view of the moderator, which do not use a bender to help mitigate the fast neutron background, are the most challenging. For these beam lines we propose the innovative shielding of placing blocks of material directly into the guide system, which allow a minimum attenuation of the cold and thermal fluxes relative to the background suppression. This shielding configuration has been worked into a beam line model using Geant4. We study particularly the advantages of single crystal sapphire and silicon blocks.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
filter, Instrument backgrounds, neutrons, sapphire, spallation source
in
Journal of Neutron Research
volume
18
issue
4
pages
10 pages
publisher
IOS Press
external identifiers
  • scopus:85002326548
ISSN
1023-8166
DOI
10.3233/JNR-160034
language
English
LU publication?
yes
id
7ecc4fa6-7e8a-423f-8052-7597047c7af7
date added to LUP
2017-02-16 15:02:40
date last changed
2017-02-16 15:02:40
@article{7ecc4fa6-7e8a-423f-8052-7597047c7af7,
  abstract     = {<p>The long (3 ms) proton pulse of the European Spallation Source (ESS) gives rise to unique and potentially high backgrounds for the instrument suite. In such a source an instrument's capabilities will be limited by its Signal to Noise (S/N) ratio. The instruments with a direct view of the moderator, which do not use a bender to help mitigate the fast neutron background, are the most challenging. For these beam lines we propose the innovative shielding of placing blocks of material directly into the guide system, which allow a minimum attenuation of the cold and thermal fluxes relative to the background suppression. This shielding configuration has been worked into a beam line model using Geant4. We study particularly the advantages of single crystal sapphire and silicon blocks.</p>},
  author       = {Santoro, V. and Cai, X. and DiJulio, D. D. and Ansell, S. and Bentley, P. M.},
  issn         = {1023-8166},
  keyword      = {filter,Instrument backgrounds,neutrons,sapphire,spallation source},
  language     = {eng},
  number       = {4},
  pages        = {135--144},
  publisher    = {IOS Press},
  series       = {Journal of Neutron Research},
  title        = {In-beam background suppression shield},
  url          = {http://dx.doi.org/10.3233/JNR-160034},
  volume       = {18},
  year         = {2015},
}