Systematic performance study of common neutron guide geometries
(2012) In Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment 696. p.75-84- Abstract
- In this report, we present the results from a systematic benchmarking of four different long neutron guide geometries: elliptic, parabolic, ballistic (piecewise linearly focusing/defocusing), and straight, for various wavelength, divergence restriction, and guide length settings. In this work, we mapped relevant parts of the neutron phase space to show where advanced guide geometries have significant transport advantages over simple guide geometries. The primary findings are that the elliptic and parabolic geometries perform almost equally well, and they are considerably superior to the other geometries, except for low-divergence, cold neutrons. In addition, it was observed that transporting thermal neutrons more than 100 m using elliptic... (More)
- In this report, we present the results from a systematic benchmarking of four different long neutron guide geometries: elliptic, parabolic, ballistic (piecewise linearly focusing/defocusing), and straight, for various wavelength, divergence restriction, and guide length settings. In this work, we mapped relevant parts of the neutron phase space to show where advanced guide geometries have significant transport advantages over simple guide geometries. The primary findings are that the elliptic and parabolic geometries perform almost equally well, and they are considerably superior to the other geometries, except for low-divergence, cold neutrons. In addition, it was observed that transporting thermal neutrons more than 100 m using elliptic guides was possible with only a 10% loss in the phase space density for divergences up to +/- 0.5 degrees, which enables the construction of very long thermal neutron instruments. Our work will allow instrument designers to use tabulated, standard geometries as a starting point for optimising the guide required for the particular instrument. (C) 2012 Elsevier B.V. All rights reserved. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3372550
- author
- Kleno, Kaspar Hewitt ; Lieutenant, Klaus ; Andersen, Ken LU and Lefmann, Kim
- organization
- publishing date
- 2012
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Neutron guides, Ray tracing, Monte Carlo, Neutron scattering, European, Spallation Source, Elliptic guides
- in
- Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment
- volume
- 696
- pages
- 75 - 84
- publisher
- Elsevier
- external identifiers
-
- wos:000311570900007
- scopus:84866511766
- ISSN
- 0167-5087
- DOI
- 10.1016/j.nima.2012.08.027
- language
- English
- LU publication?
- yes
- id
- c5315039-55c5-4383-8cc0-ec30375dbd94 (old id 3372550)
- date added to LUP
- 2016-04-01 12:52:35
- date last changed
- 2022-04-06 01:21:51
@article{c5315039-55c5-4383-8cc0-ec30375dbd94,
abstract = {{In this report, we present the results from a systematic benchmarking of four different long neutron guide geometries: elliptic, parabolic, ballistic (piecewise linearly focusing/defocusing), and straight, for various wavelength, divergence restriction, and guide length settings. In this work, we mapped relevant parts of the neutron phase space to show where advanced guide geometries have significant transport advantages over simple guide geometries. The primary findings are that the elliptic and parabolic geometries perform almost equally well, and they are considerably superior to the other geometries, except for low-divergence, cold neutrons. In addition, it was observed that transporting thermal neutrons more than 100 m using elliptic guides was possible with only a 10% loss in the phase space density for divergences up to +/- 0.5 degrees, which enables the construction of very long thermal neutron instruments. Our work will allow instrument designers to use tabulated, standard geometries as a starting point for optimising the guide required for the particular instrument. (C) 2012 Elsevier B.V. All rights reserved.}},
author = {{Kleno, Kaspar Hewitt and Lieutenant, Klaus and Andersen, Ken and Lefmann, Kim}},
issn = {{0167-5087}},
keywords = {{Neutron guides; Ray tracing; Monte Carlo; Neutron scattering; European; Spallation Source; Elliptic guides}},
language = {{eng}},
pages = {{75--84}},
publisher = {{Elsevier}},
series = {{Nuclear Instruments & Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment}},
title = {{Systematic performance study of common neutron guide geometries}},
url = {{http://dx.doi.org/10.1016/j.nima.2012.08.027}},
doi = {{10.1016/j.nima.2012.08.027}},
volume = {{696}},
year = {{2012}},
}