Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Physics of Plasmas
2 (1995), S. 3222-3233
ISSN:
1089-7674
Source:
AIP Digital Archive
Topics:
Physics
Notes:
The effects of both magnetic field and collisions on presheath properties are experimentally investigated in plasmas with electron temperatures much greater than ion temperatures. Measurements of plasma potential in collisionless plasmas show presheath thicknesses at boundaries oblique to magnetic field to be approximately (Cs/ωci)sin ψ, where Cs is the ion sound speed, ωci is the ion gyrofrequency, and Ψ is the angle between the magnetic field and the normal to the wall boundary. Measurements of plasma potential in collisional plasmas find presheaths consisting of two distinctive regions. With ion–neutral collision mean-free path λn〈(Cs/ωci)sin ψ, the presheath region next to the sheath has collisional characteristics and a thickness of approximately (0.5–0.6)λn. The corresponding presheath region adjacent to the bulk plasma has magnetic characteristics and a thickness of approximately (0.5–0.9)(Cs/ωci)sin ψ. Equipotential contours in the collisional region of this presheath are found to be parallel to the boundary, while those in the magnetic region are not. © 1995 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.871153
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