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Title: Multi-group Fokker-Planck proton transport in MCNP{trademark}

Abstract

MCNP has been enhanced to perform proton transport using a multigroup Fokker Planck (MGFP) algorithm with primary emphasis on proton radiography simulations. The new method solves the Fokker Planck approximation to the Boltzmann transport equation for the small angle multiple scattering portion of proton transport. Energy loss is accounted for by applying a group averaged stopping power over each transport step. Large angle scatter and non-inelastic events are treated as extinction. Comparisons with the more rigorous LAHET code show agreement to a few per cent for the total transmitted currents. The angular distributions through copper and low Z compounds show good agreement between LAHET and MGFP with the MGFP method being slightly less forward peaked and without the large angle tails apparent in the LAHET simulation. Suitability of this method for proton radiography simulations is shown for a simple problem of a hole in a copper slab. LAHET and MGFP calculations of position, angle and energy through more complex objects are presented.

Authors:
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Assistant Secretary for Management and Administration, Washington, DC (United States)
OSTI Identifier:
627135
Report Number(s):
LA-UR-97-2497; CONF-971125-
ON: DE97009136; TRN: AD-a339 680
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: 1997 American Nuclear Society (ANS) winter meeting, Albuquerque, NM (United States), 16-20 Nov 1997; Other Information: PBD: Nov 1997
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; COMPUTERIZED SIMULATION; PROTON TRANSPORT; TRANSPORT THEORY; BOLTZMANN EQUATION; FOKKER-PLANCK EQUATION; SCATTERING; MULTIGROUP THEORY; MONTE CARLO METHOD; THREE-DIMENSIONAL CALCULATIONS; MGFP(MULTIGROUP FOKKER PLANCK); MCNP CODE SYSTEM; LAHET CODE SYSTEM

Citation Formats

Adams, K J. Multi-group Fokker-Planck proton transport in MCNP{trademark}. United States: N. p., 1997. Web.
Adams, K J. Multi-group Fokker-Planck proton transport in MCNP{trademark}. United States.
Adams, K J. 1997. "Multi-group Fokker-Planck proton transport in MCNP{trademark}". United States. https://www.osti.gov/servlets/purl/627135.
@article{osti_627135,
title = {Multi-group Fokker-Planck proton transport in MCNP{trademark}},
author = {Adams, K J},
abstractNote = {MCNP has been enhanced to perform proton transport using a multigroup Fokker Planck (MGFP) algorithm with primary emphasis on proton radiography simulations. The new method solves the Fokker Planck approximation to the Boltzmann transport equation for the small angle multiple scattering portion of proton transport. Energy loss is accounted for by applying a group averaged stopping power over each transport step. Large angle scatter and non-inelastic events are treated as extinction. Comparisons with the more rigorous LAHET code show agreement to a few per cent for the total transmitted currents. The angular distributions through copper and low Z compounds show good agreement between LAHET and MGFP with the MGFP method being slightly less forward peaked and without the large angle tails apparent in the LAHET simulation. Suitability of this method for proton radiography simulations is shown for a simple problem of a hole in a copper slab. LAHET and MGFP calculations of position, angle and energy through more complex objects are presented.},
doi = {},
url = {https://www.osti.gov/biblio/627135}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Nov 01 00:00:00 EST 1997},
month = {Sat Nov 01 00:00:00 EST 1997}
}

Conference:
Other availability
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