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Fast ions in mode conversion heating (He-3)-H plasmas in JET
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
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2012 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 54, no 7, p. 074010-Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2012. Vol. 54, no 7, p. 074010-
Keywords [en]
Electric discharges, Experiments, Magnetic fields, Plasma heating, Plasmas
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-99406DOI: 10.1088/0741-3335/54/7/074010ISI: 000305891500011Scopus ID: 2-s2.0-84855339897OAI: oai:DiVA.org:kth-99406DiVA, id: diva2:542351
Note
QC 20120731Available from: 2012-07-31 Created: 2012-07-30 Last updated: 2017-12-07Bibliographically approved

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Johnson, Thomas Joe

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