Effcient generation of energetic ions in multi-ion plasmas by radio-frequency heating

Yevgen Kazakov (Corresponding Author), Leena Aho-Mantila, Markus Airila, Antti Hakola, Seppo Koivuranta, Jari Likonen, S.-P. Pehkonen, Antti Salmi, Paula Siren, Tuomas Tala, et al.

    Research output: Contribution to journalArticleScientificpeer-review

    32 Citations (Scopus)

    Abstract

    We describe a new technique for the effcient generation of high-energy ions with electromagnetic ion cyclotron waves in multi-ion plasmas. The discussed 'three-ion' scenarios are especially suited for strong wave absorption by a very low number of resonant ions. To observe this effect, the plasma composition has to be properly adjusted, as prescribed by theory. We demonstrate the potential of the method on the world-largest plasma magnetic confinement device, JET (Joint European Torus, Culham, UK), and the high-magnetic-field tokamak Alcator C-Mod (Cambridge, USA). The obtained results demonstrate effcient acceleration of 3He ions to high energies in dedicated hydrogen-deuterium mixtures. Simultaneously, effective plasma heating is observed, as a result of the slowing-down of the fast 3He ions. The developed technique is not only limited to laboratory plasmas, but can also be applied to explain observations of energetic ions in space-plasma environments, in particular, 3He-rich solar flares.

    Original languageEnglish
    Pages (from-to)973-978
    Number of pages6
    JournalNature Physics
    Volume13
    Issue number10
    DOIs
    Publication statusPublished - 4 Oct 2017
    MoE publication typeA1 Journal article-refereed

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