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

Tuomas Viitanen, Jaakko Leppänen

    Research output: Contribution to journalArticleScientificpeer-review

    54 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.",
    keywords = "Monte Carlo, on-the-fly, Doppler-broadening",
    author = "Tuomas Viitanen and Jaakko Lepp{\"a}nen",
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    year = "2012",
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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

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    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

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