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Fast ions in mode c...
Fast ions in mode conversion heating (He-3)-H plasmas in JET
- Article/chapterEnglish2012
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2012-06-22
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IOP Publishing,2012
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:kth-99406
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99406URI
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https://doi.org/10.1088/0741-3335/54/7/074010DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-178102URI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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QC 20120731
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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.
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Van Eester, D.
(author)
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Lerche, E.
(author)
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Hellsten, TorbjörnKTH,Fusionsplasmafysik(Swepub:kth)u16w7v9f
(author)
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Ongena, J.
(author)
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Mayoral, M-L
(author)
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Cecil, F. E.
(author)
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Darrow, D.
(author)
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Johnson, M. GatuUppsala universitet,Tillämpad kärnfysik
(author)
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Goloborod'ko, V.
(author)
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Gorini, G.
(author)
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Hellesen, CarlUppsala universitet,Tillämpad kärnfysik(Swepub:uu)cahel173
(author)
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Johnson, Thomas JoeKTH,Fusionsplasmafysik(Swepub:kth)u1xypjyh
(author)
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Lin, Y.
(author)
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Maslov, M.
(author)
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Nocente, M.
(author)
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Tardocchi, M.
(author)
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Voitsekhovitch, I.
(author)
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KTHFusionsplasmafysik
(creator_code:org_t)
Related titles
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In:Plasma Physics and Controlled Fusion: IOP Publishing54:7, s. 074010-0741-33351361-6587
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Kiptily, V. G.
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Van Eester, D.
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Lerche, E.
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Hellsten, Torbjö ...
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Ongena, J.
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Mayoral, M-L
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Cecil, F. E.
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Darrow, D.
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Johnson, M. Gatu
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Goloborod'ko, V.
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Gorini, G.
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Hellesen, Carl
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Johnson, Thomas ...
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Lin, Y.
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Maslov, M.
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Nocente, M.
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Tardocchi, M.
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Voitsekhovitch, ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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Plasma Physics a ...
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Royal Institute of Technology
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Uppsala University