Helium, iron and electron particle transport and energy transport studies on the TFTR tokamak
- Princeton Univ., NJ (United States). Plasma Physics Lab.
- Wisconsin Univ., Madison, WI (United States)
Results 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.
- Research Organization:
- Princeton Univ., NJ (United States). Plasma Physics Lab.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 10141674
- Report Number(s):
- PPPL--2881; ON: DE93011502
- Country of Publication:
- United States
- Language:
- English
Similar Records
Helium, iron and electron particle transport and energy transport studies on the TFTR tokamak
Helium, iron, and electron particle transport and energy transport studies on the Tokamak Fusion Test Reactor
Particle and energy transport studies on TFTR and implications for helium ash in future fusion devices
Technical Report
·
Sun Feb 28 19:00:00 EST 1993
·
OSTI ID:6871790
Helium, iron, and electron particle transport and energy transport studies on the Tokamak Fusion Test Reactor
Journal Article
·
Wed Jun 30 20:00:00 EDT 1993
· Physics of Fluids B; (United States)
·
OSTI ID:6424000
Particle and energy transport studies on TFTR and implications for helium ash in future fusion devices
Conference
·
Sun Feb 28 19:00:00 EST 1993
·
OSTI ID:10145612