Convective Cells and Their Relationship to Vortex Diffusion in the Wisconsin Levitated Octupole.
Abstract
Nonazimuthally symmetric floating potential structure (also called vortices or convection cells) were examined to determine whether the structure is responsible for enhanced diffusion in the Octupole. Two gun plasma were used: a collisionless H plasma and a collisional He plasma. 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 are rotated about one of the internal rings to show the three dimensional potential structure.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1978
- Bibcode:
- 1978PhDT........21E
- Keywords:
-
- Physics: Fluid and Plasma;
- Plasma Diffusion;
- Plasma Physics;
- Plasma Potentials;
- Vortices;
- Collisional Plasmas;
- Collisionless Plasmas;
- Diffusion Coefficient;
- Helium Plasma;
- Hydrogen Plasma;
- Toroidal Plasmas;
- Plasma Physics