Measurement of iron transport in the TFTR tokamak by charge exchange recombination spectroscopy
- 1 January 1991
- journal article
- letter
- Published by IOP Publishing in Nuclear Fusion
- Vol. 31 (1) , 171-175
- https://doi.org/10.1088/0029-5515/31/1/015
Abstract
Transport of iron in TFTR discharges heated by 6.7 MW of co-injected neutral beam power has been studied by spatially resolved charge exchange recombination spectroscopy in the visible region of the spectrum. The time evolutions of the densities of Fe24+ and Fe23+ ions following injection of iron are modelled by the neoclassical flux plus a moderately hollow diffusivity, increasing linearly from 1.3 m2/s on axis to 2.4 m2/s at the plasma edge. For r/a > 0.5, the iron diffusivity is significantly smaller than the helium diffusivity measured in identical discharges, while it is larger in the region immediately surrounding the plasma axis.Keywords
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