TY - JOUR
T1 - Core Vφ and Ti profiles and transport in TFTR DD and DT plasmas with lithium conditioning
AU - Bush, C. E.
AU - Bell, R. E.
AU - LeBlanc, B.
AU - Mansfield, D. K.
AU - Synakowski, E. J.
AU - Budny, R. V.
AU - Hill, K. W.
AU - Houlberg, W.
AU - Mazzucato, E.
AU - Mioduszewski, P.
AU - Park, H.
AU - Skinner, C. H.
AU - Zarnstorff, M. C.
PY - 1997/2/2
Y1 - 1997/2/2
N2 - 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.
AB - 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.
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U2 - 10.1016/S0022-3115(96)00627-7
DO - 10.1016/S0022-3115(96)00627-7
M3 - Conference article
AN - SCOPUS:0031546543
SN - 0022-3115
VL - 241-243
SP - 892
EP - 896
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
T2 - Proceedings of the 1996 12th International Conference on Plasma-Surface Interactions in Controlled Fusion Devices
Y2 - 20 May 1996 through 24 May 1996
ER -