Fast-ion redistribution due to sawtooth crash in the TEXTOR tokamak measured by collective Thomson scattering
- 12 August 2010
- journal article
- research article
- Published by IOP Publishing in Plasma Physics and Controlled Fusion
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 degrees to the magnetic field we find a drop in the fast-ion distribution of 20-40%. For a resolved angle of 83 degrees to the magnetic field the drop is no larger than 20%.Keywords
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