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

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http://hdl.handle.net/10138/308100

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Kazakov , Y O , Alcator C-Mod Team , JET Contributors , Ahlgren , T J , Aho-Mantila , L , Airila , M , Asunta , O , Björkas , C M I , Groth , M , Hakola , A , Järvinen , A , Karhunen , J , Koivuranta , S , Lahtinen , A A , Lasa Esquisabel , A , Nordlund , K H & Safi , E 2017 , ' Efficient generation of energetic ions in multi-ion plasmas by radio-frequency heating ' , Nature Physics , vol. 13 , no. 10 , pp. 973-978 . https://doi.org/10.1038/NPHYS4167

Title: Efficient generation of energetic ions in multi-ion plasmas by radio-frequency heating
Author: Kazakov, Ye. O.; Alcator C-Mod Team; JET Contributors; Ahlgren, Tommy Juha; Aho-Mantila, L.; Airila, M.; Asunta, O.; Björkas, Carolina Maria Isabel; Groth, M.; Hakola, A.; Järvinen, A.; Karhunen, J.; Koivuranta, S.; Lahtinen, Aki Alvar; Lasa Esquisabel, Ane; Nordlund, Kai Henrik; Safi, Elnaz
Contributor organization: Materials Physics
Department of Physics
Date: 2017-10
Language: eng
Number of pages: 6
Belongs to series: Nature Physics
ISSN: 1745-2473
DOI: https://doi.org/10.1038/NPHYS4167
URI: http://hdl.handle.net/10138/308100
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.
Subject: HE-3-RICH SOLAR-FLARES
MODE CONVERSION
CYCLOTRON RANGE
FUSION
JET
FREQUENCY
TOKAMAK
PHYSICS
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by_nc_sa
Usage restriction: openAccess
Self-archived version: acceptedVersion


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