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

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Research output: Contribution to journalArticleScientificpeer-review

Abstract

We describe a new technique for the efficient 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 efficient acceleration of He-3 ions to high energies in dedicated hydrogendeuterium mixtures. Simultaneously, effective plasma heating is observed, as a result of the slowing-down of the fast He-3 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, He-3-rich solar flares.

Original languageEnglish
Pages (from-to)973-978
Number of pages10
JournalNature Physics
Volume13
Issue number10
DOIs
Publication statusPublished - Oct 2017
MoE publication typeA1 Journal article-refereed

Keywords

  • HE-3-RICH SOLAR-FLARES
  • MODE CONVERSION
  • CYCLOTRON RANGE
  • FUSION
  • JET
  • FREQUENCY
  • TOKAMAK
  • PHYSICS

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