Corrections for the geometric distortion of the tube detectors on SANS instruments at ORNL
Abstract
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 facilitiesmore »
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- 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 Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Biological and Environmental Research (BER)
- OSTI Identifier:
- 1185386
- Alternate Identifier(s):
- OSTI ID: 1247604
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
- Additional Journal Information:
- Journal Volume: 775; Journal Issue: C; Journal ID: ISSN 0168-9002
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 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
Citation Formats
He, Lilin, Do, Changwoo, Qian, Shuo, Wignall, George D., Heller, William T., Littrell, Kenneth C., and Smith, Gregory S. Corrections for the geometric distortion of the tube detectors on SANS instruments at ORNL. United States: N. p., 2014.
Web. doi:10.1016/j.nima.2014.11.061.
He, Lilin, Do, Changwoo, Qian, Shuo, Wignall, George D., Heller, William T., Littrell, Kenneth C., & Smith, Gregory S. Corrections for the geometric distortion of the tube detectors on SANS instruments at ORNL. United States. https://doi.org/10.1016/j.nima.2014.11.061
He, Lilin, Do, Changwoo, Qian, Shuo, Wignall, George D., Heller, William T., Littrell, Kenneth C., and Smith, Gregory S. 2014.
"Corrections for the geometric distortion of the tube detectors on SANS instruments at ORNL". United States. https://doi.org/10.1016/j.nima.2014.11.061. https://www.osti.gov/servlets/purl/1185386.
@article{osti_1185386,
title = {Corrections for the geometric distortion of the tube detectors on SANS instruments at ORNL},
author = {He, Lilin and Do, Changwoo and Qian, Shuo and Wignall, George D. and Heller, William T. and Littrell, Kenneth C. and Smith, Gregory S.},
abstractNote = {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.},
doi = {10.1016/j.nima.2014.11.061},
url = {https://www.osti.gov/biblio/1185386},
journal = {Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment},
issn = {0168-9002},
number = C,
volume = 775,
place = {United States},
year = {Tue Nov 25 00:00:00 EST 2014},
month = {Tue Nov 25 00:00:00 EST 2014}
}
Web of Science
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