5 years ago

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

Efficient generation of energetic ions in multi-ion plasmas by radio-frequency heating
Ye. O. Kazakov, D. Gallart, S. J. Wukitch, J. Bielecki, H. Weisen, M. F. F. Nave, T. Golfinopoulos, M. Fitzgerald, D. Valcarcel, L. Giacomelli, J. Ongena, E. Lerche, A. Czarnecka, D. Van Eester, J. M. Faustin, J. C. Wright, M. Porkolab, Y. Baranov, M. Lennholm, M. Nocente, Y. Lin, V. Bobkov, R. Bilato, T. Loarer, R. Felton, T. Johnson, V. G. Kiptily, T. Craciunescu, S. E. Sharapov, M. Van Schoor, A. E. Hubbard, F. Nabais, Ph. Jacquet, K. Crombé, M. J. Mantsinen
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 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.

Publisher URL: http://dx.doi.org/10.1038/nphys4167

DOI: 10.1038/nphys4167

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.