Corrections for the geometric distortion of the tube detectors on SANS instruments at ORNL

He, Lilin; Do, Changwoo; Qian, Shuo; Wignall, George D.; Heller, William T.; Littrell, Kenneth C.; Smith, Gregory S.

doi:10.1016/j.nima.2014.11.061

Title: Corrections for the geometric distortion of the tube detectors on SANS instruments at ORNL

Journal Article · Tue Nov 25 00:00:00 EST 2014 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2014.11.061· OSTI ID:1185386

^[1]; Do, Changwoo ^[1]; Qian, Shuo ^[1]; Wignall, George D. ^[1]; Heller, William T. ^[1]; Littrell, Kenneth C. ^[1]; Smith, Gregory S. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Small-angle neutron scattering instruments at the Oak Ridge National Laboratory's High Flux Isotope Reactor were upgraded in area detectors from the large, single volume crossed-wire detectors originally installed to staggered arrays of linear position-sensitive detectors (LPSDs). The specific geometry of the LPSD array requires that approaches to data reduction traditionally employed be modified. Here, two methods for correcting the geometric distortion produced by the LPSD array are presented and compared. The first method applies a correction derived from a detector sensitivity measurement performed using the same configuration as the samples are measured. In the second method, a solid angle correction is derived that can be applied to data collected in any instrument configuration during the data reduction process in conjunction with a detector sensitivity measurement collected at a sufficiently long camera length where the geometric distortions are negligible. Furthermore, both methods produce consistent results and yield a maximum deviation of corrected data from isotropic scattering samples of less than 5% for scattering angles up to a maximum of 35°. The results are broadly applicable to any SANS instrument employing LPSD array detectors, which will be increasingly common as instruments having higher incident flux are constructed at various neutron scattering facilities around the world.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1185386

Alternate ID(s):: OSTI ID: 1247604

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 775, Issue C; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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The high-intensity option of the SANS diffractometer KWS-2 at JCNS – characterization and performance of the new multi-megahertz detection system Houston, Judith Elizabeth; Brandl, Georg; Drochner, Matthias Journal of Applied Crystallography, Vol. 51, Issue 2 https://doi.org/10.1107/s1600576718004132	journal	March 2018
Detection of vapor nanobubbles by small angle neutron scattering (SANS) Popov, Emilian; He, Lilin; Dominguez-Ontiveros, Elvis Applied Physics Letters, Vol. 112, Issue 15 https://doi.org/10.1063/1.5023595	journal	April 2018
The high-intensity option of the SANS diffractometer KWS-2 at JCNS - characterization and performance of the new multi-megahertz detection system Houston, Judith Elizabeth; Brandl, Georg; Drochner, Matthias RWTH Aachen University https://doi.org/10.18154/rwth-2019-10480	text	January 2018

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46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
Linear position-sensitive detector
Small-angle neutron scattering
Staggered array geometry
Solid angle correction
Tube detector shadowing

Title: Corrections for the geometric distortion of the tube detectors on SANS instruments at ORNL

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Cited By (3)

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