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Generic guide concepts for the European Spallation Source

Zendler, Carolin LU ; Rodriguez, D. Martin and Bentley, Phillip LU (2015) In Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment 803. p.89-99
Abstract
The construction of the European Spoliation Source (ESS) faces many challenges from the neutron beam transport point of view: the spoliation source is specified as being driven by a 5 MW beam of protons, each with 2 GeV energy, and yet the requirements in instrument background suppression relative to measured signal vary between 10(-6) and 10(-8). The energetic particles, particularly above 20 MeV, which are expected to be produced in abundance in the target, have to be filtered in order to make the beamlines safe, operational and provide good quality measurements with low background. We present generic neutron guides of short and medium length instruments which are optimised for good performance at minimal cost. Direct line of sight to... (More)
The construction of the European Spoliation Source (ESS) faces many challenges from the neutron beam transport point of view: the spoliation source is specified as being driven by a 5 MW beam of protons, each with 2 GeV energy, and yet the requirements in instrument background suppression relative to measured signal vary between 10(-6) and 10(-8). The energetic particles, particularly above 20 MeV, which are expected to be produced in abundance in the target, have to be filtered in order to make the beamlines safe, operational and provide good quality measurements with low background. We present generic neutron guides of short and medium length instruments which are optimised for good performance at minimal cost. Direct line of sight to the source is avoided twice, with either the first point out of line of sight or both being inside the bunker (20 m) to minimise shielding costs. These guide geometries are regarded as a baseline to define standards for instruments to be constructed at ESS. They are used to find commonalities and develop principles and solutions for common problems. Lastly, we report the impact of employing the over-illumination concept to mitigate losses from random misalignment passively, and that over-illumination should be used sparingly in key locations to be effective. For more widespread alignment issues, a more direct, active approach is likely to be needed. (C) 2015 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Monte Carlo simulation, VITESS, European spoliation source, Misalignment, Neutron scattering instrumentation, Neutron guides
in
Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
volume
803
pages
89 - 99
publisher
Elsevier
external identifiers
  • wos:000363464600013
  • scopus:84943625042
ISSN
0167-5087
DOI
10.1016/j.nima.2015.09.035
language
English
LU publication?
yes
id
7e20ba20-a334-41b0-ac28-1a92b082887f (old id 8398187)
date added to LUP
2015-12-21 08:24:36
date last changed
2017-02-12 03:41:11
@article{7e20ba20-a334-41b0-ac28-1a92b082887f,
  abstract     = {The construction of the European Spoliation Source (ESS) faces many challenges from the neutron beam transport point of view: the spoliation source is specified as being driven by a 5 MW beam of protons, each with 2 GeV energy, and yet the requirements in instrument background suppression relative to measured signal vary between 10(-6) and 10(-8). The energetic particles, particularly above 20 MeV, which are expected to be produced in abundance in the target, have to be filtered in order to make the beamlines safe, operational and provide good quality measurements with low background. We present generic neutron guides of short and medium length instruments which are optimised for good performance at minimal cost. Direct line of sight to the source is avoided twice, with either the first point out of line of sight or both being inside the bunker (20 m) to minimise shielding costs. These guide geometries are regarded as a baseline to define standards for instruments to be constructed at ESS. They are used to find commonalities and develop principles and solutions for common problems. Lastly, we report the impact of employing the over-illumination concept to mitigate losses from random misalignment passively, and that over-illumination should be used sparingly in key locations to be effective. For more widespread alignment issues, a more direct, active approach is likely to be needed. (C) 2015 Elsevier B.V. All rights reserved.},
  author       = {Zendler, Carolin and Rodriguez, D. Martin and Bentley, Phillip},
  issn         = {0167-5087},
  keyword      = {Monte Carlo simulation,VITESS,European spoliation source,Misalignment,Neutron scattering instrumentation,Neutron guides},
  language     = {eng},
  pages        = {89--99},
  publisher    = {Elsevier},
  series       = {Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment},
  title        = {Generic guide concepts for the European Spallation Source},
  url          = {http://dx.doi.org/10.1016/j.nima.2015.09.035},
  volume       = {803},
  year         = {2015},
}