Convective cells and their relationship to vortex diffusion in the Wisconsin levitated octupole

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1978

OSTI ID:5292932

Ehrhardt, A B

Non-azimuthally symmetric floating potential structure (also called vortices or convective cells) was examined to determine whether the structure is responsible for enhanced diffusion in the Octupole. Two gun plasmas were used: a collisionless H plasma (n/sub 0/ approx. 5 x 10/sup 9/ cm/sup -3/, T/sub io/ approx. 30 eV); and a collisional He plasma (n/sub 0/ approx. 2 x 10/sup 11/ cm/sup -3/, T/sub i,e/ approx. .2eV). The floating potential was measured as a function of the coordinates perpendicular to the magnetic field by a Langmuir probe mounted on a cart which could be moved azimuthally along the bottom of the Octupole; the results are presented as two-dimensional contour plots. For a purely poloidal field, the floating potential was found to be constant along a magnetic field line, and the two-dimensional contours can be rotated about one of the internal rings to show the three-dimensional potential structure.

• Research Organization: Wisconsin Univ., Madison (USA)
• OSTI ID: 5292932
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700104* -- Fusion Energy-- Plasma Research-- Plasma Kinetics-Experimental-- (-1987)
CLOSED CONFIGURATIONS
CRYOGENIC FLUIDS
ELECTRIC POTENTIAL
ELECTRIC PROBES
ELEMENTS
FLUIDS
HELIUM
HYDROGEN
LANGMUIR PROBE
MAGNETIC FIELD CONFIGURATIONS
MULTIPOLAR CONFIGURATIONS
NONMETALS
OCTUPOLAR CONFIGURATIONS
PLASMA DRIFT
PLASMA GUNS
PROBES
RARE GASES
VORTICES