Fast-ion redistribution due to sawtooth crash in the TEXTOR tokamak measured by collective Thomson scattering

S.K. Nielsen, H. Bindslev, M. Salewski, A. Bürger, E.G. Delabie, V. Furtula, M. Kantor, S.B. Korsholm, F. Leipold, F. Meo, P.K. Michelsen, D. Moseev, J.W. Oosterbeek, M. Stejner, E. Westerhof, P. Woskov

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Abstract

Here we present collective Thomson scattering measurements of 1D fast-ion velocity distribution functions in neutral beam heated TEXTOR plasmas with sawtooth oscillations. Up to 50% of the fast ions in the centre are redistributed as a consequence of a sawtooth crash. We resolve various directions to the magnetic field. The fast-ion distribution is found to be anisotropic as expected. For a resolved angle of 39¿ to the magnetic field we find a drop in the fast-ion distribution of 20–40%. For a resolved angle of 83¿ to the magnetic field the drop is no larger than 20%. (Some figures in this article are in colour only in the electronic version)
Original languageEnglish
Article number092001
Pages (from-to)092001-1/8
Number of pages8
JournalPlasma Physics and Controlled Fusion
Volume52
Issue number9
DOIs
Publication statusPublished - 2010

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