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  • Kiptily, V. G. (author)

Fast ions in mode conversion heating (He-3)-H plasmas in JET

  • Article/chapterEnglish2012

Publisher, publication year, extent ...

  • 2012-06-22
  • IOP Publishing,2012
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:kth-99406
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99406URI
  • https://doi.org/10.1088/0741-3335/54/7/074010DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-178102URI

Supplementary language notes

  • Language:English
  • Summary in:English

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Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • QC 20120731
  • 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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Added entries (persons, corporate bodies, meetings, titles ...)

  • Van Eester, D. (author)
  • Lerche, E. (author)
  • Hellsten, TorbjörnKTH,Fusionsplasmafysik(Swepub:kth)u16w7v9f (author)
  • Ongena, J. (author)
  • Mayoral, M-L (author)
  • Cecil, F. E. (author)
  • Darrow, D. (author)
  • Johnson, M. GatuUppsala universitet,Tillämpad kärnfysik (author)
  • Goloborod'ko, V. (author)
  • Gorini, G. (author)
  • Hellesen, CarlUppsala universitet,Tillämpad kärnfysik(Swepub:uu)cahel173 (author)
  • Johnson, Thomas JoeKTH,Fusionsplasmafysik(Swepub:kth)u1xypjyh (author)
  • Lin, Y. (author)
  • Maslov, M. (author)
  • Nocente, M. (author)
  • Tardocchi, M. (author)
  • Voitsekhovitch, I. (author)
  • KTHFusionsplasmafysik (creator_code:org_t)

Related titles

  • In:Plasma Physics and Controlled Fusion: IOP Publishing54:7, s. 074010-0741-33351361-6587

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