Explicit treatment of thermal motion in continuous-energy Monte Carlo tracking routines

Tuomas Viitanen, Jaakko Leppänen

Research output: Contribution to journalArticleScientificpeer-review

53 Citations (Scopus)

Abstract

This paper introduces a new stochastic method for taking the effect of thermal motion into account on the fly in a Monte Carlo neutron transport calculation. The method is based on explicit treatment of the motion of target nuclei at collision sites and, consequently, requires simply cross sections at a temperature of 0 K regardless of the number of temperatures in the problem geometry. It utilizes rejection sampling techniques to manage the fact that total cross sections become distributed quantities. The method has a novel capability of accurately modeling continuous temperature distributions. The new stochastic method is verified using a simple test program, which compares its results to an analytical reference solution based on NJOY-broadened cross sections. Future implementation to Monte Carlo reactor physics code Serpent is also discussed shortly.
Original languageEnglish
Pages (from-to)165-173
Number of pages9
JournalNuclear Science and Engineering
Volume171
Issue number2
DOIs
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

Fingerprint

Neutrons
Temperature distribution
Physics
Sampling
Temperature
Geometry
Hot Temperature

Keywords

  • Monte Carlo
  • on-the-fly
  • Doppler-broadening

Cite this

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title = "Explicit treatment of thermal motion in continuous-energy Monte Carlo tracking routines",
abstract = "This paper introduces a new stochastic method for taking the effect of thermal motion into account on the fly in a Monte Carlo neutron transport calculation. The method is based on explicit treatment of the motion of target nuclei at collision sites and, consequently, requires simply cross sections at a temperature of 0 K regardless of the number of temperatures in the problem geometry. It utilizes rejection sampling techniques to manage the fact that total cross sections become distributed quantities. The method has a novel capability of accurately modeling continuous temperature distributions. The new stochastic method is verified using a simple test program, which compares its results to an analytical reference solution based on NJOY-broadened cross sections. Future implementation to Monte Carlo reactor physics code Serpent is also discussed shortly.",
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Explicit treatment of thermal motion in continuous-energy Monte Carlo tracking routines. / Viitanen, Tuomas; Leppänen, Jaakko.

In: Nuclear Science and Engineering, Vol. 171, No. 2, 2012, p. 165-173.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Explicit treatment of thermal motion in continuous-energy Monte Carlo tracking routines

AU - Viitanen, Tuomas

AU - Leppänen, Jaakko

N1 - Project code: 73801

PY - 2012

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N2 - This paper introduces a new stochastic method for taking the effect of thermal motion into account on the fly in a Monte Carlo neutron transport calculation. The method is based on explicit treatment of the motion of target nuclei at collision sites and, consequently, requires simply cross sections at a temperature of 0 K regardless of the number of temperatures in the problem geometry. It utilizes rejection sampling techniques to manage the fact that total cross sections become distributed quantities. The method has a novel capability of accurately modeling continuous temperature distributions. The new stochastic method is verified using a simple test program, which compares its results to an analytical reference solution based on NJOY-broadened cross sections. Future implementation to Monte Carlo reactor physics code Serpent is also discussed shortly.

AB - This paper introduces a new stochastic method for taking the effect of thermal motion into account on the fly in a Monte Carlo neutron transport calculation. The method is based on explicit treatment of the motion of target nuclei at collision sites and, consequently, requires simply cross sections at a temperature of 0 K regardless of the number of temperatures in the problem geometry. It utilizes rejection sampling techniques to manage the fact that total cross sections become distributed quantities. The method has a novel capability of accurately modeling continuous temperature distributions. The new stochastic method is verified using a simple test program, which compares its results to an analytical reference solution based on NJOY-broadened cross sections. Future implementation to Monte Carlo reactor physics code Serpent is also discussed shortly.

KW - Monte Carlo

KW - on-the-fly

KW - Doppler-broadening

U2 - 10.13182/NSE11-36

DO - 10.13182/NSE11-36

M3 - Article

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SP - 165

EP - 173

JO - Nuclear Science and Engineering

JF - Nuclear Science and Engineering

SN - 0029-5639

IS - 2

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