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Fast ions in mode conversion heating (He-3)-H plasmas in JET
- Kiptily, V. G. (author)
- Van Eester, D. (author)
- Lerche, E. (author)
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- Ongena, J. (author)
- Mayoral, M-L (author)
- Cecil, F. E. (author)
- Darrow, D. (author)
- Goloborod'ko, V. (author)
- Gorini, G. (author)
- Lin, Y. (author)
- Maslov, M. (author)
- Nocente, M. (author)
- Tardocchi, M. (author)
- Voitsekhovitch, I. (author)
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- (creator_code:org_t)
- 2012-06-22
- 2012
- English.
- In: Plasma Physics and Controlled Fusion. - : IOP Publishing. - 0741-3335 .- 1361-6587. ; 54:7, s. 074010-
- Journal article (peer-reviewed)
Abstract
Subject headings
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- Fast ions were analysed in experiments focusing on fundamental He-3 minority and mode conversion (MC) in the ion cyclotron resonance range of frequencies (ICRF) in H plasmas and on second harmonic heating of He-3 ions at 2.65 T mimicking D-T plasma heating in ITER at half its nominal toroidal magnetic field. Gamma-ray spectrometry, neutral particle analysers and fast-ion loss diagnostics provided information on the generation of fast-ion populations and on the distribution of ICRH power among the species in various heating scenarios and for a large range of He-3 concentrations. In the scenario with the fundamental He-3 minority and MC wave heating at B-T(0) = 3.41 T and f approximate to 32 MHz, fast He-3 ions accelerated by ICRH in the MeV energy range were detected in discharges with low He-3 concentration. In the experiments with a He-3 concentration scan it was found that at a He-3 concentration of approximate to 2.2% the He-3 ion losses disappeared while a population of energetic D ions gradually built up due to a redistribution of the ICRH power between species on reaching the first MC regime. Under those conditions the ICRF-heated D beam ions effectively absorbed the wave power at their Doppler shifted resonance, which was close to the plasma centre. In discharges with second harmonic heating of He-3 ions at B-T(0) = 2.65 T and f approximate to 52 MHz, the confined energetic He-3 ions were found in the MeV energy range. There is some evidence that the D ions were also accelerated by ICRF. This paper also demonstrates that the synergy of the various fast ion diagnostics allows making a broad picture of the physics of the redistribution of the absorbed ICRH power in complicated heating scenarios of JET.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- Electric discharges
- Experiments
- Magnetic fields
- Plasma heating
- Plasmas
Publication and Content Type
- ref (subject category)
- art (subject category)
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- Kiptily, V. G.
- Van Eester, D.
- Lerche, E.
- Hellsten, Torbjö ...
- Ongena, J.
- Mayoral, M-L
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- Cecil, F. E.
- Darrow, D.
- Johnson, M. Gatu
- Goloborod'ko, V.
- Gorini, G.
- Hellesen, Carl
- Johnson, Thomas ...
- Lin, Y.
- Maslov, M.
- Nocente, M.
- Tardocchi, M.
- Voitsekhovitch, ...
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- Uppsala University
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