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46 results on '"Zumbro JD"'

1. Proton radiography applications with MCNP5.

Author

Zumbro JD, Acuff A, Bull JS, Hughes HG, Prael RE, and Selcow EC

Subjects
Algorithms, Computer Simulation, Computer-Aided Design, Linear Energy Transfer, Models, Statistical, Monte Carlo Method, Radiation Dosage, Scattering, Radiation, Software Design, User-Computer Interface, Protons, Radiation Protection methods, Radiographic Image Interpretation, Computer-Assisted methods, Radiography methods, Radiometry methods, Software
Abstract

A modified version of MCNP5 has been developed to treat continuous-energy proton transport. This work is summarised in companion papers by Hughes et al. and Bull et al. (in these proceedings). An intrinsic part of this development effort has involved testing, verification and validation of a capability for simulating proton radiographs. This paper presents the results of calculations simulating various different test objects and the effects of alternative physics models. The significant physics processes include elastic scattering, multiple coulomb scattering, collisional energy-loss and straggling, magnetic fields and attenuation owing to nuclear interactions. Comparisons with experimental data are presented.

Published
2005
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2. Magnetic field tracking with MCNP5.

Author

Bul JS, Hughes HG, Walstrom PL, Zumbro JD, and Mokhov NV

Subjects
Computer Simulation, Radiation Dosage, Radiation Protection methods, Electromagnetic Fields, Heavy Ions, Linear Energy Transfer, Models, Statistical, Monte Carlo Method, Radiometry methods, Software
Abstract

With the introduction of continuous-energy heavy charged particle transport in MCNP5, the need for tracking charged particles in a magnetic field becomes increasingly important. Two methods for including magnetic field effects on charged particles are included in the proton transport version of the code. The first technique utilises transfer maps produced by the beam dynamics simulation and analysis code COSY INFINITY. This method is fast and accurate; however, its use is limited to void cells only and to ensembles of particles with a fairly small energy spread. The second technique, particle ray tracing, is based on an algorithm adopted from the MARS transport code. This method can be applied to both void and material cells and is valid over a very large range of particle energies. Results from tracking particles in a quadrupole 'identity lens' using the two techniques are compared.

Published
2005
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3. MCNP5 for proton radiography.

Author

Hughes HG, Brown FB, Bull JS, Goorley JT, Little RC, Liu LC, Mashnik SG, Prael RE, Selcow EC, Sierk AJ, Sweezy JE, Zumbro JD, Mokhov NV, Striganov SI, and Gudima KK

Subjects
Algorithms, Computer Simulation, Computer-Aided Design, Linear Energy Transfer, Models, Statistical, Radiation Dosage, Scattering, Radiation, Software Design, User-Computer Interface, Monte Carlo Method, Protons, Radiation Protection methods, Radiographic Image Interpretation, Computer-Assisted methods, Radiography methods, Radiometry methods, Software
Abstract

The developmental version of MCNP5 has recently been extended to provide for continuous-energy transport of high-energy protons. This enhancement involves the incorporation of several significant new physics models into the code. Multiple Coulomb scattering is treated with an advanced model that takes account of projectile and nuclear target form factors. In the next version, this model will provide a coupled sampling of both angular deflection and collisional energy loss, including straggling. The proton elastic scattering model is also new, based on recent theoretical work. Charged particle transport in the presence of magnetic fields is accomplished either by using transfer maps from the COSY INFINITY code (in void regions) or by using an algorithm adapted from the MARS code (in void regions or in scattering materials). Work is underway to validate and implement the latest versions of the Cascade-Exciton Model and the Los Alamos Quark-Gluon String Model, which will process inelastic nuclear interactions and generate secondary particles.

Published
2005
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11. He-vector3(e-vectore') quasielastic asymmetry.

Author

Jones CE, Beise EJ, Belz JE, Carr RW, Filippone BW, Lorenzon W, McKeown RD, Mueller BA, O'Neill TG, Dodson GW, Dow K, Farkhondeh M, Kowalski S, Lee K, Makins N, Milner R, Thompson A, Tieger D, van den Brand JF, Young A, Yu X, and Zumbro JD

Published
1993
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17. Pion absorption in heavy nuclei.

Author

Ransome RD, Morris CL, Cupps VR, Fergerson RW, McGill JA, Watson DL, Zumbro JD, Ritchie BG, Comfort JR, Tinsley JR, Loveman RA, Dawson S, Green A, Gugelot PC, and Moore CF

Published
1992
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