Muon momentum reconstruction algorithms for the CRIPT spectrometer

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Authors
  1. Drouin, P-L.
  2. Waller, D.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
The goal of the Cosmic Ray Inspection and Passive Tomography (CRIPT) for Special Nuclear Material (SNM) Detection project is to design, build and test a large-scale muon scattering tomography (MST) system for detecting SNM and dense radiation-shielding materials like lead. Measuring the momenta of muons on an event-by-event basis is a critical part of MST as it reduces the required detection times significantly compared to making no momentum measurements. This paper describes improved algorithms for the estimation of muon momenta. Improved algorithms were required due to modifications of the CRIPT design: the spectrometer height had to be reduced from 2.0 m to 1.0 m. After investigating several momentum estimation algorithms, a Bayesian estimator, using either flat or cosmic ray muon priors, was found to be the best. These studies also resulted in a re-design of CRIPT’s muon spectrometer: the number of scattering and detector layers was reduced from four to two, and the thickness of each iron scattering layer was increased from 5 cm to 10 cm.

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Report Number
DRDC-OTTAWA-TM-2011-210 — Technical Memorandum
Date of publication
01 Dec 2011
Number of Pages
50
DSTKIM No
CA036806
CANDIS No
536467
Format(s):
Electronic Document(PDF)

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