Radial guiding-center drifts and omnigenity in bumpy-torus confinement systems

Technical Report · Thu Jul 01 04:00:00 EDT 1982

OSTI ID:5119587

Hazeltine, R D; Catto, P J

Collisional transport of a high-temperature plasma across the confining field of a bumpy torus magnetic confinement system depends sensitively upon the functional form of the radial guiding center drift, and thus upon details of the confinement geometry. A general and relatively explicit formula for the radial drift is derived, using the large aspect-ratio results of a previous equilibrium study. Allowance is made for (i) arbitrary toroidal variation of the confining field; (ii) field distortion due to plasma currents; (iii) non-circular deformation of the toroidal field coils. However, the analysis pertains only to the plasma core, and not to the high-beta annuli (electron rings) which are usually present in experiments. The question of bumpy torus omnigenity - whether any bumpy torus field configuration is consistent with a vanishing, or nearly vanishing, radial drift - is also investigated. It is found that omnigenity cannot occur, at least in the vicinity of the magnetic axis.

• Research Organization: Science Applications, Inc., Boulder, CO (USA). Plasma Research Inst.
• DOE Contract Number: AC03-76ET53057
• OSTI ID: 5119587
• Report Number(s): SAI-254-82-200-LJ; PRI-45; ON: DE82019802
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700105* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Theoretical-- (-1987)
ASPECT RATIO
ELMO BUMPY TORUS
ELMO DEVICES
GUIDING-CENTER APPROXIMATION
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC MIRRORS
OPEN PLASMA DEVICES
PLASMA DRIFT
THERMONUCLEAR DEVICES
TRANSPORT THEORY