Study of neutron shielding collimators for curved beamlines at the European Spallation Source
(2018) 4th International Workshop on Accelerator Radiation Induced Activation, ARIA 2017 In Journal of Physics: Conference Series 1046.- Abstract
The European Spallation Source is being constructed in Lund, Sweden and is planned to be the world's brightest pulsed spallation neutron source for cold and thermal neutron beams (≤ 1 eV). The facility uses a 2 GeV proton beam to produce neutrons from a tungsten target. The neutrons are then moderated in a moderator assembly consisting of both liquid hydrogen and water compartments. Surrounding the moderator are 22 beamports, which view the moderator's outside surfaces. The beamports are connected to long neutron guides that transport the moderated neutrons to the sample position via reflections. As well as the desired moderated neutrons, fast neutrons coming directly from the target can find their way down the beamlines. These can... (More)
The European Spallation Source is being constructed in Lund, Sweden and is planned to be the world's brightest pulsed spallation neutron source for cold and thermal neutron beams (≤ 1 eV). The facility uses a 2 GeV proton beam to produce neutrons from a tungsten target. The neutrons are then moderated in a moderator assembly consisting of both liquid hydrogen and water compartments. Surrounding the moderator are 22 beamports, which view the moderator's outside surfaces. The beamports are connected to long neutron guides that transport the moderated neutrons to the sample position via reflections. As well as the desired moderated neutrons, fast neutrons coming directly from the target can find their way down the beamlines. These can create unwanted sources of background for the instruments. To mitigate such a kind of background, several instruments will use curved guides to lose direct line-of-sight (LoS) to the moderator and the target. In addition instruments can also use shielding collimators to reduce the amount of fast neutrons further traveling down the guide due to albedo reflections or streaming. Several different materials have been proposed for this purpose. We present the results of a study of different options for collimators and identify the optimal choices that balance cost, background and activation levels.
(Less)
- author
- Santoro, V. LU ; Dijulio, D. D. LU ; Ansell, S. LU ; Cherkashyna, N. LU ; Muhrer, G. and Bentley, P. M. LU
- organization
- publishing date
- 2018-06-12
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- host publication
- Journal of Physics: Conference Series
- series title
- Journal of Physics: Conference Series
- volume
- 1046
- article number
- 012010
- edition
- 1
- conference name
- 4th International Workshop on Accelerator Radiation Induced Activation, ARIA 2017
- conference location
- Lund, Sweden
- conference dates
- 2017-05-22 - 2017-05-24
- external identifiers
-
- scopus:85049556058
- ISSN
- 1742-6588
- DOI
- 10.1088/1742-6596/1046/1/012010
- language
- English
- LU publication?
- yes
- id
- 03edb5b2-a63c-4e12-a8f8-72fd86df4bb1
- date added to LUP
- 2018-07-25 10:19:38
- date last changed
- 2022-04-17 21:36:54
@inproceedings{03edb5b2-a63c-4e12-a8f8-72fd86df4bb1,
abstract = {{<p>The European Spallation Source is being constructed in Lund, Sweden and is planned to be the world's brightest pulsed spallation neutron source for cold and thermal neutron beams (≤ 1 eV). The facility uses a 2 GeV proton beam to produce neutrons from a tungsten target. The neutrons are then moderated in a moderator assembly consisting of both liquid hydrogen and water compartments. Surrounding the moderator are 22 beamports, which view the moderator's outside surfaces. The beamports are connected to long neutron guides that transport the moderated neutrons to the sample position via reflections. As well as the desired moderated neutrons, fast neutrons coming directly from the target can find their way down the beamlines. These can create unwanted sources of background for the instruments. To mitigate such a kind of background, several instruments will use curved guides to lose direct line-of-sight (LoS) to the moderator and the target. In addition instruments can also use shielding collimators to reduce the amount of fast neutrons further traveling down the guide due to albedo reflections or streaming. Several different materials have been proposed for this purpose. We present the results of a study of different options for collimators and identify the optimal choices that balance cost, background and activation levels.</p>}},
author = {{Santoro, V. and Dijulio, D. D. and Ansell, S. and Cherkashyna, N. and Muhrer, G. and Bentley, P. M.}},
booktitle = {{Journal of Physics: Conference Series}},
issn = {{1742-6588}},
language = {{eng}},
month = {{06}},
series = {{Journal of Physics: Conference Series}},
title = {{Study of neutron shielding collimators for curved beamlines at the European Spallation Source}},
url = {{http://dx.doi.org/10.1088/1742-6596/1046/1/012010}},
doi = {{10.1088/1742-6596/1046/1/012010}},
volume = {{1046}},
year = {{2018}},
}