ISSN:
1089-7666
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Plasma flow measurements in the presheath have been performed using two types of directional electric "Mach'' probes, in the PISCES facility at UCLA [J. Nucl. Mater. 121, 277 (1984)]. A fast scanning versatile probe combination has been developed, which operates simultaneously as a "magnetized'' Mach probe, an "unmagnetized'' Mach probe (with characteristic probe size greater than and smaller than ion gyroradius, respectively), and an emissive probe. Presheaths have been investigated by inserting a small object at the center of the plasma column. Variations in plasma flow velocity, density, and potential along the presheath have been deduced by fluid and kinetic theories. A comparison is made between Mach numbers obtained from the magnetized probe and the unmagnetized probe. Incorporation of shear viscosity of order ∼0.5nmiD⊥ in the cross-field transport along the presheath seems best to model the results. The cross-field diffusivity (D⊥) is found to scale approximately proportional to B−1/2, with magnitude about 4× larger than Bohm in the PISCES plasma. The effect of an electrical bias applied to the object on the presheath characteristics is discussed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.859039
