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

Paula Sirén (Corresponding Author), Jari Varje, Henri Weisen, Luca Giacomelli, Aaron Ho, Massimo Nocente, JET Contributors

    Research output: Contribution to journalArticleScientificpeer-review

    7 Citations (Scopus)


    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
    JournalFusion Engineering and Design
    Publication statusPublished - 1 Sept 2019
    MoE publication typeA1 Journal article-refereed


    This work has been carried out within the framework of the EURO fusion Consortium and has received funding from the Euratom research and training programme 2014-2018 under grant agreement No 633053 . The views and opinions expressed herein do not necessarily reflect those of the European Commission. This work was partially funded by the Academy of Finland project No. 259675. Some of the calculations were performed using computer resources within the Aalto University School of Science” Science-IT” project.


    • Fusion products
    • JET
    • Synthetic diagnostics


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