Impact of crystallite size on the performance of a beryllium reflector
(2020) In Journal of Neutron Research 22(2-3). p.275-279- Abstract
Beryllium reflectors are used at spallation neutron sources in order to enhance the low-energy flux of neutrons emanating from the surface of a cold and thermal moderator. The design of such a moderator/reflector system is typically carried out using detailed Monte-Carlo simulations, where the beryllium reflector is assumed to behave as a poly-crystalline material. In reality, however, inhomogeneities in the beryllium could lead to discrepancies between the performance of the actual system when compared to the modeled system. The dependence of the total cross-section in particular on crystallite size, in the Bragg scattering region, could influence the reflector performance, and if such an effect is significant, it should be taken into... (More)
Beryllium reflectors are used at spallation neutron sources in order to enhance the low-energy flux of neutrons emanating from the surface of a cold and thermal moderator. The design of such a moderator/reflector system is typically carried out using detailed Monte-Carlo simulations, where the beryllium reflector is assumed to behave as a poly-crystalline material. In reality, however, inhomogeneities in the beryllium could lead to discrepancies between the performance of the actual system when compared to the modeled system. The dependence of the total cross-section in particular on crystallite size, in the Bragg scattering region, could influence the reflector performance, and if such an effect is significant, it should be taken into account in the design of the moderator/reflector system. In this paper, we report on the preliminary results of using cross-section libraries, which include corrections for the crystallite size effect, in spallation source neutronics calculations.
(Less)
- author
- Dijulio, Douglas D. LU ; Lee, Yong Joong LU and Muhrer, Gunter
- organization
- publishing date
- 2020
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- beryllium, MCNP, Neutron cross-section, NJOY, spallation source
- in
- Journal of Neutron Research
- volume
- 22
- issue
- 2-3
- pages
- 5 pages
- publisher
- IOS Press
- external identifiers
-
- scopus:85094569369
- ISSN
- 1023-8166
- DOI
- 10.3233/JNR-190135
- language
- English
- LU publication?
- yes
- id
- 6aa2b022-53af-4965-954f-cad3ff585179
- date added to LUP
- 2020-11-23 06:45:51
- date last changed
- 2022-04-26 21:59:54
@article{6aa2b022-53af-4965-954f-cad3ff585179,
abstract = {{<p>Beryllium reflectors are used at spallation neutron sources in order to enhance the low-energy flux of neutrons emanating from the surface of a cold and thermal moderator. The design of such a moderator/reflector system is typically carried out using detailed Monte-Carlo simulations, where the beryllium reflector is assumed to behave as a poly-crystalline material. In reality, however, inhomogeneities in the beryllium could lead to discrepancies between the performance of the actual system when compared to the modeled system. The dependence of the total cross-section in particular on crystallite size, in the Bragg scattering region, could influence the reflector performance, and if such an effect is significant, it should be taken into account in the design of the moderator/reflector system. In this paper, we report on the preliminary results of using cross-section libraries, which include corrections for the crystallite size effect, in spallation source neutronics calculations. </p>}},
author = {{Dijulio, Douglas D. and Lee, Yong Joong and Muhrer, Gunter}},
issn = {{1023-8166}},
keywords = {{beryllium; MCNP; Neutron cross-section; NJOY; spallation source}},
language = {{eng}},
number = {{2-3}},
pages = {{275--279}},
publisher = {{IOS Press}},
series = {{Journal of Neutron Research}},
title = {{Impact of crystallite size on the performance of a beryllium reflector}},
url = {{http://dx.doi.org/10.3233/JNR-190135}},
doi = {{10.3233/JNR-190135}},
volume = {{22}},
year = {{2020}},
}