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Title: Predicting image blur in proton radiography: comparisons between measurements and Monte Carlo simulations

Abstract

Given the cost and lead-times involved in high-energy proton radiography, it is prudent to model proposed radiographic experiments to see if the images predicted would return useful information. We recently modified our raytracing transmission radiography modeling code HADES to perform simplified Monte Carlo simulations of the transport of protons in a proton radiography beamline. Beamline objects include the initial diffuser, vacuum magnetic fields, windows, angle-selecting collimators, and objects described as distorted 2D (planar or cylindrical) meshes or as distorted 3D hexahedral meshes. We present an overview of the algorithms used for the modeling and code timings for simulations through typical 2D and 3D meshes. We next calculate expected changes in image blur as scattering materials are placed upstream and downstream of a resolution test object (a 3 mm thick sheet of tantalum, into which 0.4 mm wide slits have been cut), and as the current supplied to the focusing magnets is varied. We compare and contrast the resulting simulations with the results of measurements obtained at the 800 MeV Los Alamos LANSCE Line-C proton radiography facility.

Authors:
; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1009646
Report Number(s):
LLNL-PROC-431532
Journal ID: ISSN 0168-9002; TRN: US1101762
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Journal Volume: 652; Journal Issue: 1; Conference: Presented at: Symposium on Radiation Measurements and Applications, Ann Arbor, MI, United States, May 24 - May 27, 2010
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUMM MECHANICS, GENERAL PHYSICS; ALGORITHMS; COLLIMATORS; FOCUSING; MAGNETIC FIELDS; MAGNETS; PROTON RADIOGRAPHY; PROTONS; RADIATIONS; RESOLUTION; SCATTERING; SIMULATION; TANTALUM; TRANSPORT; WINDOWS

Citation Formats

von Wittenau, A, Aufderheide, M B, and Henderson, G L. Predicting image blur in proton radiography: comparisons between measurements and Monte Carlo simulations. United States: N. p., 2010. Web. doi:10.1016/j.nima.2010.08.052.
von Wittenau, A, Aufderheide, M B, & Henderson, G L. Predicting image blur in proton radiography: comparisons between measurements and Monte Carlo simulations. United States. https://doi.org/10.1016/j.nima.2010.08.052
von Wittenau, A, Aufderheide, M B, and Henderson, G L. 2010. "Predicting image blur in proton radiography: comparisons between measurements and Monte Carlo simulations". United States. https://doi.org/10.1016/j.nima.2010.08.052. https://www.osti.gov/servlets/purl/1009646.
@article{osti_1009646,
title = {Predicting image blur in proton radiography: comparisons between measurements and Monte Carlo simulations},
author = {von Wittenau, A and Aufderheide, M B and Henderson, G L},
abstractNote = {Given the cost and lead-times involved in high-energy proton radiography, it is prudent to model proposed radiographic experiments to see if the images predicted would return useful information. We recently modified our raytracing transmission radiography modeling code HADES to perform simplified Monte Carlo simulations of the transport of protons in a proton radiography beamline. Beamline objects include the initial diffuser, vacuum magnetic fields, windows, angle-selecting collimators, and objects described as distorted 2D (planar or cylindrical) meshes or as distorted 3D hexahedral meshes. We present an overview of the algorithms used for the modeling and code timings for simulations through typical 2D and 3D meshes. We next calculate expected changes in image blur as scattering materials are placed upstream and downstream of a resolution test object (a 3 mm thick sheet of tantalum, into which 0.4 mm wide slits have been cut), and as the current supplied to the focusing magnets is varied. We compare and contrast the resulting simulations with the results of measurements obtained at the 800 MeV Los Alamos LANSCE Line-C proton radiography facility.},
doi = {10.1016/j.nima.2010.08.052},
url = {https://www.osti.gov/biblio/1009646}, journal = {},
issn = {0168-9002},
number = 1,
volume = 652,
place = {United States},
year = {2010},
month = {5}
}

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