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

Author(s)
Kazakov, Ye O.; Ongena, J.; Lerche, E.; Mantsinen, M. J.; Van Eester, D.; Craciunescu, T.; Kiptily, V. G.; Nocente, M.; Nabais, F.; Nave, M. F. F.; Baranov, Y.; Bielecki, J.; Bilato, R.; Bobkov, V.; Crombé, K.; Czarnecka, A.; Faustin, J. M.; Felton, R.; Fitzgerald, M.; Gallart, D.; Giacomelli, L.; Jacquet, Ph.; Johnson, T.; Lennholm, M.; Loarer, T.; Sharapov, S. E.; Valcarcel, D.; Van Schoor, M.; Weisen, H.; Wright, John C; Wukitch, Stephen James; Lin, Yijun; Golfinopoulos, Theodore; Hubbard, Amanda E; Porkolab, Miklos; ... Show more Show less
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Alternative title
Efficient generation of energetic ions in multi-ion plasmas by radio-frequency heating
Terms of use
Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/
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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 3 He 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 3 He 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, 3 He-rich solar flares.
Date issued
2017-06
URI
http://hdl.handle.net/1721.1/114949
Department
Massachusetts Institute of Technology. Plasma Science and Fusion Center
Journal
Nature Physics
Publisher
Springer Nature
Citation
Kazakov, Ye. O. et al. “Efficient Generation of Energetic Ions in Multi-Ion Plasmas by Radio-Frequency Heating.” Nature Physics 13, 10 (June 2017): 973–978 © 2017 Macmillan Publishers Limited, part of Springer Nature
Version: Author's final manuscript
ISSN
1745-2473
1745-2481

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