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TF ripple effects on the NBI deuteron confinement in JET
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics. KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics. Culham Science Centre, United Kingdom .
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2007 (English)In: 34th EPS Conference on Plasma Physics 2007, EPS 2007 - Europhysics Conference Abstracts, 2007, no 2, 876-879 p.Conference paper (Refereed)
Abstract [en]

Ripple induced reduction of the fluxes of deuterium neutrals in the 5-40 keV energy range from the plasma mid-plane was observed in recent JET experiments. The maximum observed reduction of D0 fluxes due to ripple is approximately 50 % and occurs at energies above 30 keV. In positive shear plasmas without ICRH ripple reduction of D0 fluxes vanishes at energies below 10 keV. However, in the case of plasmas with low or reversed shear core, increased D0 fluxes were observed for energies below 10-20 keV in the presence of additional ripple and ICRH heating. Interpretive modeling of the deuterium neutral emission that accounts for the superbanana ripple diffusion of NBI ions is in reasonable agreement with measurements at least for the scenarios without ICRH. Note that ripples may essentially effect the fast ion confinement in ITER where TF ripple magnitude at the outer separatrix is expected to be δ ∼ 0.5%.

Place, publisher, year, edition, pages
2007. no 2, 876-879 p.
Keyword [en]
Energy ranges, Fast-ion confinement, Reversed shear, Ripple diffusion, Ripple effects, Ripple reduction, Separatrix, Shear plasmas
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-154703ScopusID: 2-s2.0-84873856068ISBN: 978-162276334-4OAI: diva2:758461
34th European Physical Society Conference on Plasma Physics 2007, EPS 2007, 2 July 2007 through 6 July 2007, Warsaw, Poland

QC 20141027

Available from: 2014-10-27 Created: 2014-10-27 Last updated: 2014-10-27Bibliographically approved

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Cecconello, Marco
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