Confinement studies of ohmically heated plasmas in TFTR
Systematic scans of density in large deuterium plasmas (a = 0.83 m) at several values of plasma current and toroidal magnetic field strength indicate that the total energy confinement time, tau/sub E/, is proportional to the line-average density anti n/sub e/ and the limiter q. Confinement times of approx. 0.3 s have been observed for anti n/sub e/ = 2.8 x 10/sup 19/ m/sup -3/. Plasma size scaling experiments with plasmas of minor radii a = 0.83, 0.69, 0.55, and 0.41 m at constant limiter q reveal a confinement dependence on minor radius. The major-radius dependence of tau/sub E/, based on a comparison between TFTR and PLT results, is consistent with R/sup 2/ scaling. From the power balance, the thermal diffusivity chi/sub e/ is found to be significantly less than the INTOR value. In the a = 0.41 m plasmas, saturation of confinement is due to neoclassical ion conduction (chi/sub i/ neoclassical >> chi/sub e/).
- Research Organization:
- Princeton Univ., NJ (USA). Plasma Physics Lab.
- DOE Contract Number:
- AC02-76CH03073
- OSTI ID:
- 5959386
- Report Number(s):
- PPPL-2193; CONF-840910-25; ON: DE85008718
- Resource Relation:
- Conference: 10. international conference on plasma physics and controlled nuclear fusion research, London, UK, 12 Sep 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
TFTR REACTORS
PLASMA CONFINEMENT
ASPECT RATIO
DEUTERIUM
JOULE HEATING
PLASMA DENSITY
SCALING LAWS
CONFINEMENT
ELECTRIC HEATING
HEATING
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
NUCLEI
ODD-ODD NUCLEI
PLASMA HEATING
RESISTANCE HEATING
STABLE ISOTOPES
THERMONUCLEAR REACTORS
TOKAMAK TYPE REACTORS
700100* - Fusion Energy- Plasma Research