2312 K
43 pp.
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TitleHelium, Iron and Electron Particle Transport and Energy Transport Studies on the TFTR Tokamak
Author(s)Synakowski, E. J.; Efthimion, P. C.; Rewoldt, G.; Stratton, B. C.; Tang, W. M.; Grek, B.; Hill, K. W.; Hulse, R. A.; Johnson, D .W.; Mansfield, D. K.; McCune, D.; Mikkelsen, D. R.; Park, H. K.; Ramsey, A. T.; Redi, M. H.; Scott, S. D.; Taylor, G.; Timberlake, J.; Zarnstorff, M. C. (Princeton Univ., NJ (United States). Plasma Physics Lab.); Kissick, M. W. (Wisconsin Univ., Madison, WI (United States))
Publication DateMarch 1993
Report NumberPPPL-2881
Unique IdentifierACC0141
Other NumbersLegacy ID: DE93011502; OSTI ID: 6871790
Research OrgPrinceton Univ., NJ (United States). Princeton Plasma Physics Laboratory (PPPL).
Contract NoAC02-76CH03073
Sponsoring OrgUS Department of Energy (USDOE), Washington, DC (United States)
Subject700330 -- Plasma Kinetics, Transport, & Impurities -- (1992-); TFTR Tokamak -- Charged-particle Transport; Beam Injection Heating; Energy Transfer; Heat Flux; Helium Ash; Helium Ions; Iron Ions
KeywordsCharged Particles; Closed Plasma Devices; Heating; Helium Ions; Ions; Plasma Heating; Radiation Transport; Thermonuclear Devices; Tokamak Devices
Related Web PagesRussell Hulse, the First Binary Pulsar, and Science Education
AbstractResults from helium, iron, and electron transport on TFTR in L-mode and Supershot deuterium plasmas with the same toroidal field, plasma current, and neutral beam heating power are presented. They are compared to results from thermal transport analysis based on power balance. Particle diffusivities and thermal conductivities are radially hollow and larger than neoclassical values, except possibly near the magnetic axis. The ion channel dominates over the electron channel in both particle and thermal diffusion. A peaked helium profile, supported by inward convection that is stronger than predicted by neoclassical theory, is measured in the Supershot The helium profile shape is consistent with predictions from quasilinear electrostatic drift-wave theory. While the perturbative particle diffusion coefficients of all three species are similar in the Supershot, differences are found in the L-Mode. Quasilinear theory calculations of the ratios of impurity diffusivities are in good accord with measurements. Theory estimates indicate that the ion heat flux should be larger than the electron heat flux, consistent with power balance analysis. However, theoretical values of the ratio of the ion to electron heat flux can be more than a factor of three larger than experimental values. A correlation between helium diffusion and ion thermal transport is observed and has favorable implications for sustained ignition of a tokamak fusion reactor.
2312 K
43 pp.
View Document 

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