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

25 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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radio frequency heating
ions
Joint European Torus
plasma composition
space plasmas
plasma heating
solar flares
cyclotrons
deuterium
electromagnetism

Cite this

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title = "Effcient generation of energetic ions in multi-ion plasmas by radio-frequency heating",
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.",
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Effcient generation of energetic ions in multi-ion plasmas by radio-frequency heating. / Kazakov, Yevgen (Corresponding Author); Aho-Mantila, Leena; Airila, Markus; Hakola, Antti; Koivuranta, Seppo; Likonen, Jari; Pehkonen, S.-P.; Salmi, Antti; Siren, Paula; Tala, Tuomas; et al.

In: Nature Physics, Vol. 13, No. 10, 04.10.2017, p. 973-978.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Koivuranta, Seppo

AU - Likonen, Jari

AU - Pehkonen, S.-P.

AU - Salmi, Antti

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