Core Vφ and Ti profiles and transport in TFTR DD and DT plasmas with lithium conditioning

C. E. Bush, R. E. Bell, B. LeBlanc, D. K. Mansfield, E. J. Synakowski, R. V. Budny, K. W. Hill, W. Houlberg, E. Mazzucato, P. Mioduszewski, H. Park, C. H. Skinner, M. C. Zarnstorff

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

High performance DT plasmas have been obtained using neutral beam heating with lithium (Li) conditioned graphite walls in TFTR. Values of τE>300 ms have been obtained with neutron source rates of >1018 n/s and nτT≈1021. Also, ion temperature (Ti)>40 keV and toroidal velocity (Vφ)>3800 km/s have been obtained. The Ti(R, t) and Vφ(R, t) profiles show strong gradients near the plasma core with ▽Vφ>3.5×106/s and E×B shearing rate >2×105/s realized. This strong E×B flow shear is consistent with formation of a `transport barrier' in the plasma core. Measured Vφ, Ti, and carbon density, nc, profiles from charge-exchange recombination spectroscopy (CHERS) and neoclassical calculations of poloidal velocity, Vθ, are used to assess the roles of the pressure and velocity contributions to Er (or E×B) with varying Li conditioning. The profiles and gradients and resulting confinement and transport are found to vary with the amount of Li applied and the Li deposition technique. Correlations between the Vφ, and Ti profiles and recycling and impurity behavior as implied from edge carbon and Dα light and Li deposition are also observed.

Original languageEnglish
Pages (from-to)892-896
Number of pages5
JournalJournal of Nuclear Materials
Volume241-243
DOIs
StatePublished - 2 Feb 1997
EventProceedings of the 1996 12th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices - Saint-Raphael, Fr
Duration: 20 May 199624 May 1996

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