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Elimination of ghosting artifacts from wavelength-shifting fiber neutron detectors
Clonts.L.G., Diawara.Y., Hannan.B.W., Hodges.J.P., Wang.C.L.
2013
Source PublicationReview of Scientific Instruments
ISSN0034-6748
Volume84Pages:013308
AbstractMisassignment of neutron position (ghosting) produces artifacts which have been observed in wavelength-shifting (WLS) fiber detectors developed for time-of-flight (TOF) neutron powder diffraction. In position-sensitive detectors (PSDs) with WLS fiber encoding, thermal and cold neutrons interact with a monolithic 6LiF/ZnS:Ag scintillator screen, and scintillation photons are generated and transported through the crossed fibers to photomultipliers (PMTs). The neutron position is determined by photon counts in the PMTs within a preset time window. Ghosting occurs when neutrons hit the group boundaries of two neighboring PMTs for x-position multiplexing, which is modeled as resulting from a long travel length (about 3-5 mm) of a small number of scintillation photons. This model is supported by the change observed in aperture images when the threshold number for photon-pulses was adjusted for neutron event determination. When the threshold number of photon-pulses was set above 10 for each PMT, the ghost peaks in the aperture images and TOF spectra of powder diffraction were strongly suppressed or completely eliminated, and the intrinsic background levels of the WLS detectors were significantly reduced. Our result indicates that WLS fiber detector is a promising alternative for 3He PSDs for neutron scattering. 2013 American Institute of Physics.
Subject AreaAstronomy & Astrophysics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/9858
Collection太阳高能及相关物理过程研究团组
Recommended Citation
GB/T 7714
Clonts.L.G., Diawara.Y., Hannan.B.W., Hodges.J.P., Wang.C.L.. Elimination of ghosting artifacts from wavelength-shifting fiber neutron detectors[J]. Review of Scientific Instruments,2013,84:013308.
APA Clonts.L.G., Diawara.Y., Hannan.B.W., Hodges.J.P., Wang.C.L..(2013).Elimination of ghosting artifacts from wavelength-shifting fiber neutron detectors.Review of Scientific Instruments,84,013308.
MLA Clonts.L.G., Diawara.Y., Hannan.B.W., Hodges.J.P., Wang.C.L.."Elimination of ghosting artifacts from wavelength-shifting fiber neutron detectors".Review of Scientific Instruments 84(2013):013308.
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