Measurement of iron transport in the tftr tokamak by charge exchange recombination spectroscopy

B. C. Stratton, E. J. Synakowski, P. C. Efthimion, R. J. Fonck, K. W. Hill, R. A. Hulse, D. W. Johnson, H. Park, G. Taylor, J. Timberlake

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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. Thç time evolutions of the densities of Fe24+ and Fe23+ ions following injection of iron are modelled by the neoclassical flux plus a moderately hollow diffii- sivity, 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.

Original languageEnglish
Pages (from-to)171-175
Number of pages5
JournalNuclear Fusion
Volume31
Issue number1
DOIs
StatePublished - Jan 1991

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