Improvements in physics models of AFSI-ASCOT-based synthetic neutron diagnostics at JET

JET Contributors

    Research output: Contribution to journalArticleScientificpeer-review

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    Abstract

    New development steps of AFSI-ASCOT based synthetic neutron diagnostics and validation at JET are reported in this contribution. Synthetic neutron diagnostics are important not only in existing tokamaks, where they are used to interpret experimental data, but also in the design of future reactors including DEMO and beyond, where neutron detectors are one of the few diagnostics available. Thus, development and validation of realistic synthetic diagnostics is necessary for increasing confidence in existing models and future diagnostic designs. Recent development in AFSI includes physical corrections such as implementation of plasma rotation and reduction of the fast particle contribution in thermal reactant distribution. The rotation typically changes the beam-thermal reaction rates by 1–5%, while accounting for the fast particle density consistently reduces the neutron deficit (widely known inequality of the measured and calculated neutron rates) by up to 15% depending on the discharge. Further developments include implementation of angular dependence of DD differential fusion cross sections and accounting for finite Larmor radius effect, which is important for high-energy particles such as ICRH. Additionally, the role of data based analysis in synthetic diagnostics development with the help of JETPEAK database is discussed.

    Original languageEnglish
    Pages (from-to)1587-1590
    Number of pages4
    JournalFusion Engineering and Design
    Volume146
    DOIs
    Publication statusPublished - 1 Sep 2019
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Neutrons
    Physics
    Neutron detectors
    Reaction rates
    Fusion reactions
    Plasmas
    Hot Temperature

    Keywords

    • Fusion products
    • JET
    • Synthetic diagnostics

    Cite this

    @article{94e881ad32c44c249d85987d30c51ffa,
    title = "Improvements in physics models of AFSI-ASCOT-based synthetic neutron diagnostics at JET",
    abstract = "New development steps of AFSI-ASCOT based synthetic neutron diagnostics and validation at JET are reported in this contribution. Synthetic neutron diagnostics are important not only in existing tokamaks, where they are used to interpret experimental data, but also in the design of future reactors including DEMO and beyond, where neutron detectors are one of the few diagnostics available. Thus, development and validation of realistic synthetic diagnostics is necessary for increasing confidence in existing models and future diagnostic designs. Recent development in AFSI includes physical corrections such as implementation of plasma rotation and reduction of the fast particle contribution in thermal reactant distribution. The rotation typically changes the beam-thermal reaction rates by 1–5{\%}, while accounting for the fast particle density consistently reduces the neutron deficit (widely known inequality of the measured and calculated neutron rates) by up to 15{\%} depending on the discharge. Further developments include implementation of angular dependence of DD differential fusion cross sections and accounting for finite Larmor radius effect, which is important for high-energy particles such as ICRH. Additionally, the role of data based analysis in synthetic diagnostics development with the help of JETPEAK database is discussed.",
    keywords = "Fusion products, JET, Synthetic diagnostics",
    author = "Paula Sir{\'e}n and Jari Varje and Henri Weisen and Luca Giacomelli and Aaron Ho and Massimo Nocente and {JET Contributors}",
    year = "2019",
    month = "9",
    day = "1",
    doi = "10.1016/j.fusengdes.2019.02.134",
    language = "English",
    volume = "146",
    pages = "1587--1590",
    journal = "Fusion Engineering and Design",
    issn = "0920-3796",
    publisher = "Elsevier",

    }

    Improvements in physics models of AFSI-ASCOT-based synthetic neutron diagnostics at JET. / JET Contributors.

    In: Fusion Engineering and Design, Vol. 146, 01.09.2019, p. 1587-1590.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Improvements in physics models of AFSI-ASCOT-based synthetic neutron diagnostics at JET

    AU - Sirén, Paula

    AU - Varje, Jari

    AU - Weisen, Henri

    AU - Giacomelli, Luca

    AU - Ho, Aaron

    AU - Nocente, Massimo

    AU - JET Contributors

    PY - 2019/9/1

    Y1 - 2019/9/1

    N2 - New development steps of AFSI-ASCOT based synthetic neutron diagnostics and validation at JET are reported in this contribution. Synthetic neutron diagnostics are important not only in existing tokamaks, where they are used to interpret experimental data, but also in the design of future reactors including DEMO and beyond, where neutron detectors are one of the few diagnostics available. Thus, development and validation of realistic synthetic diagnostics is necessary for increasing confidence in existing models and future diagnostic designs. Recent development in AFSI includes physical corrections such as implementation of plasma rotation and reduction of the fast particle contribution in thermal reactant distribution. The rotation typically changes the beam-thermal reaction rates by 1–5%, while accounting for the fast particle density consistently reduces the neutron deficit (widely known inequality of the measured and calculated neutron rates) by up to 15% depending on the discharge. Further developments include implementation of angular dependence of DD differential fusion cross sections and accounting for finite Larmor radius effect, which is important for high-energy particles such as ICRH. Additionally, the role of data based analysis in synthetic diagnostics development with the help of JETPEAK database is discussed.

    AB - New development steps of AFSI-ASCOT based synthetic neutron diagnostics and validation at JET are reported in this contribution. Synthetic neutron diagnostics are important not only in existing tokamaks, where they are used to interpret experimental data, but also in the design of future reactors including DEMO and beyond, where neutron detectors are one of the few diagnostics available. Thus, development and validation of realistic synthetic diagnostics is necessary for increasing confidence in existing models and future diagnostic designs. Recent development in AFSI includes physical corrections such as implementation of plasma rotation and reduction of the fast particle contribution in thermal reactant distribution. The rotation typically changes the beam-thermal reaction rates by 1–5%, while accounting for the fast particle density consistently reduces the neutron deficit (widely known inequality of the measured and calculated neutron rates) by up to 15% depending on the discharge. Further developments include implementation of angular dependence of DD differential fusion cross sections and accounting for finite Larmor radius effect, which is important for high-energy particles such as ICRH. Additionally, the role of data based analysis in synthetic diagnostics development with the help of JETPEAK database is discussed.

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