Neutral beam optimisation for the spherical tokamak ST40

A. Salmi, M. Gryaznevich, P. Buxton, M. Nightingale, T. Tala

    Research output: Contribution to journalArticleScientificpeer-review

    2 Citations (Scopus)

    Abstract

    Orbit following Monte Carlo code (ASCOT) calculations of neutral beam (NB) induced torque, current and heating have been performed for a selected set of plasma scenarios to optimise the neutral beam injection system for the proposed high magnetic field spherical tokamak ST40. It is found that there are strong variations especially in the current drive efficiency and in the toroidal torque depending on the NB alignment and injection energy. The optimal alignments as well as the optimal injection energy depend both on the scenario and whether the current drive or the toroidal torque is to be maximised. Due to the relatively small calculated current drive efficiency (0.05–0.2 MA/MW) we find that for the studied scenarios a relatively central low field side (LFS) deposition below midplane provides the best overall performance still at a tolerable shine through power.

    Original languageEnglish
    Pages (from-to)14-19
    Number of pages6
    JournalFusion Engineering and Design
    Volume117
    DOIs
    Publication statusPublished - 1 Apr 2017
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Torque
    Orbits
    Magnetic fields
    Plasmas
    Heating

    Keywords

    • nuclear fusion
    • spherical tokamak
    • ST40
    • neutral beam
    • NBI

    Cite this

    Salmi, A. ; Gryaznevich, M. ; Buxton, P. ; Nightingale, M. ; Tala, T. / Neutral beam optimisation for the spherical tokamak ST40. In: Fusion Engineering and Design. 2017 ; Vol. 117. pp. 14-19.
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    abstract = "Orbit following Monte Carlo code (ASCOT) calculations of neutral beam (NB) induced torque, current and heating have been performed for a selected set of plasma scenarios to optimise the neutral beam injection system for the proposed high magnetic field spherical tokamak ST40. It is found that there are strong variations especially in the current drive efficiency and in the toroidal torque depending on the NB alignment and injection energy. The optimal alignments as well as the optimal injection energy depend both on the scenario and whether the current drive or the toroidal torque is to be maximised. Due to the relatively small calculated current drive efficiency (0.05–0.2 MA/MW) we find that for the studied scenarios a relatively central low field side (LFS) deposition below midplane provides the best overall performance still at a tolerable shine through power.",
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    author = "A. Salmi and M. Gryaznevich and P. Buxton and M. Nightingale and T. Tala",
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    Neutral beam optimisation for the spherical tokamak ST40. / Salmi, A.; Gryaznevich, M.; Buxton, P.; Nightingale, M.; Tala, T.

    In: Fusion Engineering and Design, Vol. 117, 01.04.2017, p. 14-19.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Salmi, A.

    AU - Gryaznevich, M.

    AU - Buxton, P.

    AU - Nightingale, M.

    AU - Tala, T.

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    KW - NBI

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