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Title: Benchmarking shielding simulations for an accelerator-driven spallation neutron source

Abstract

The shielding at an accelerator-driven spallation neutron facility plays a critical role in the performance of the neutron scattering instruments, the overall safety, and the total cost of the facility. Accurate simulation of shielding components is thus key for the design of upcoming facilities, such as the European Spallation Source (ESS), currently in construction in Lund, Sweden. In this paper, we present a comparative study between the measured and the simulated neutron background at the Swiss Spallation Neutron Source (SINQ), at the Paul Scherrer Institute (PSI), Villigen, Switzerland. The measurements were carried out at several positions along the SINQ monolith wall with the neutron dosimeter WENDI-2, which has a well-characterized response up to 5 GeV. The simulations were performed using the Monte-Carlo radiation transport code Geant4, and include a complete transport from the proton beam to the measurement locations in a single calculation. An agreement between measurements and simulations is about a factor of 2 for the points where the measured radiation dose is above the background level, which is a satisfactory result for such simulations spanning many energy regimes, different physics processes and transport through several meters of shielding materials. The neutrons contributing to the radiation field emanating frommore » the monolith were confirmed to originate from neutrons with energies above 1 MeV in the target region. The current work validates Geant4 as being well suited for deep-shielding calculations at accelerator-based spallation sources. We also extrapolate what the simulated flux levels might imply for short (several tens of meters) instruments at ESS.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1212321
Alternate Identifier(s):
OSTI ID: 1212366
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Published Article
Journal Name:
Physical Review Special Topics. Accelerators and Beams
Additional Journal Information:
Journal Name: Physical Review Special Topics. Accelerators and Beams Journal Volume: 18 Journal Issue: 8; Journal ID: ISSN 1098-4402
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS

Citation Formats

Cherkashyna, Nataliia, DiJulio, Douglas D., Panzner, Tobias, Rantsiou, Emmanouela, Filges, Uwe, Ehlers, Georg, and Bentley, Phillip M. Benchmarking shielding simulations for an accelerator-driven spallation neutron source. United States: N. p., 2015. Web. doi:10.1103/PhysRevSTAB.18.083501.
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Cherkashyna, Nataliia, DiJulio, Douglas D., Panzner, Tobias, Rantsiou, Emmanouela, Filges, Uwe, Ehlers, Georg, & Bentley, Phillip M. Benchmarking shielding simulations for an accelerator-driven spallation neutron source. United States. https://doi.org/10.1103/PhysRevSTAB.18.083501
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Cherkashyna, Nataliia, DiJulio, Douglas D., Panzner, Tobias, Rantsiou, Emmanouela, Filges, Uwe, Ehlers, Georg, and Bentley, Phillip M. Wed . "Benchmarking shielding simulations for an accelerator-driven spallation neutron source". United States. https://doi.org/10.1103/PhysRevSTAB.18.083501.
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@article{osti_1212321,
title = {Benchmarking shielding simulations for an accelerator-driven spallation neutron source},
author = {Cherkashyna, Nataliia and DiJulio, Douglas D. and Panzner, Tobias and Rantsiou, Emmanouela and Filges, Uwe and Ehlers, Georg and Bentley, Phillip M.},
abstractNote = {The shielding at an accelerator-driven spallation neutron facility plays a critical role in the performance of the neutron scattering instruments, the overall safety, and the total cost of the facility. Accurate simulation of shielding components is thus key for the design of upcoming facilities, such as the European Spallation Source (ESS), currently in construction in Lund, Sweden. In this paper, we present a comparative study between the measured and the simulated neutron background at the Swiss Spallation Neutron Source (SINQ), at the Paul Scherrer Institute (PSI), Villigen, Switzerland. The measurements were carried out at several positions along the SINQ monolith wall with the neutron dosimeter WENDI-2, which has a well-characterized response up to 5 GeV. The simulations were performed using the Monte-Carlo radiation transport code Geant4, and include a complete transport from the proton beam to the measurement locations in a single calculation. An agreement between measurements and simulations is about a factor of 2 for the points where the measured radiation dose is above the background level, which is a satisfactory result for such simulations spanning many energy regimes, different physics processes and transport through several meters of shielding materials. The neutrons contributing to the radiation field emanating from the monolith were confirmed to originate from neutrons with energies above 1 MeV in the target region. The current work validates Geant4 as being well suited for deep-shielding calculations at accelerator-based spallation sources. We also extrapolate what the simulated flux levels might imply for short (several tens of meters) instruments at ESS.},
doi = {10.1103/PhysRevSTAB.18.083501},
journal = {Physical Review Special Topics. Accelerators and Beams},
number = 8,
volume = 18,
place = {United States},
year = {Wed Aug 19 00:00:00 EDT 2015},
month = {Wed Aug 19 00:00:00 EDT 2015}
}
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Journal Article:
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https://doi.org/10.1103/PhysRevSTAB.18.083501
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