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

von Wittenau, A; Aufderheide, M B; Henderson, G L

doi:10.1016/j.nima.2010.08.052

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

Conference · Fri May 07 04:00:00 EDT 2010

DOI:https://doi.org/10.1016/j.nima.2010.08.052· OSTI ID:1009646

von Wittenau, A; Aufderheide, M B; Henderson, G L

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.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA

Sponsoring Organization:: USDOE

DOE Contract Number:: W-7405-ENG-48

OSTI ID:: 1009646

Report Number(s):: LLNL-PROC-431532

Country of Publication:: United States

Language:: English

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

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