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Radiation Protection Dosimetry 2005 116(1-4):307-311; doi:10.1093/rpd/nci048
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Magnetic field tracking with MCNP5

J. S. Bull1,*, H. G. Hughes1, P. L. Walstrom1, J. D. Zumbro1 and N. V. Mokhov2

1 Los Alamos National Laboratory, Los Alamos, NM 87545, USA
2 Fermi National Accelerator Laboratory, Batavia, IL 60510, USA

* Corresponding author: jsbull{at}lanl.gov

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.


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H. G. Hughes, F. B. Brown, J. S. Bull, J. T. Goorley, R. C. Little, L.-C. Liu, S. G. Mashnik, R. E. Prael, E. C. Selcow, A. J. Sierk, et al.
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Radiat Prot Dosimetry, December 20, 2005; 116(1-4): 109 - 112.
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