A new design for the standard pinhole small-angle neutron scattering instrument D11
Monte Carlo simulations have been performed to check ideas for improvements of the collimating guide system of the standard pinhole small‐angle neutron scattering (SANS) instrument D11 at Institut Laue–Langevin, which reaches very low Q values by using long detector and collimation distances. Accord...
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Published in | Journal of applied crystallography Vol. 40; no. 6; pp. 1056 - 1063 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
5 Abbey Square, Chester, Cheshire CH1 2HU, England
Blackwell Publishing Ltd
01.12.2007
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Subjects | |
Online Access | Get full text |
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Summary: | Monte Carlo simulations have been performed to check ideas for improvements of the collimating guide system of the standard pinhole small‐angle neutron scattering (SANS) instrument D11 at Institut Laue–Langevin, which reaches very low Q values by using long detector and collimation distances. According to the simulations, improved guide characteristics can increase the flux at the sample by about 10–15% for short collimation distances. Widening the guide width over the first few metres by 50% will yield a flux gain of about 40% for long and intermediate collimation distances, but a loss for short distances. A gain for all collimation distances can be achieved by a reduction of the guide cross section over the last few metres (in addition to the widening). The best performance was found for a quasi‐elliptical exit that reduces width and height to 60% of its nominal size. The effect on divergence of the neutron arriving at the sample has been studied. The changes will be realized in the framework of the ongoing D11 renewal project. |
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Bibliography: | ark:/67375/WNG-M6GL6DMW-N ArticleID:JCRDB5027 istex:373B95746E19D0997329CFE35DB7050896A040C0 ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1600-5767 0021-8898 1600-5767 |
DOI: | 10.1107/S0021889807038253 |