Title :
Smooth plasma-sheath transition in a hydrodynamic model
Author :
Godyak, Valery A. ; Sternberg, Natalia
Author_Institution :
GTE Lab. Inc., Waltham, MA, USA
fDate :
2/1/1990 12:00:00 AM
Abstract :
In the hydrodynamic plasma and sheath models, when the two models are treated separately, the use of Bohm´s (1949) criterion to obtain boundary conditions at the plasma-sheath interface leads to singularities and discontinuities in some physical quantities. This problem can be overcome by using an appropriate boundary condition; namely, by specifying a particular finite value of the electric field at the plasma-sheath interface. Using such a boundary condition and arbitrary collision parameters, sheath characteristics are then calculated continuously from the collisionless to the collisional sheath. When applied to the plasma model, this new boundary condition takes into account the space-charge effect on the behavior of the plasma at its boundary
Keywords :
electric fields; plasma collision processes; plasma sheaths; space charge; arbitrary collision parameters; boundary condition; collisional sheath; collisionless sheath; electric field; hydrodynamic model; hydrodynamic plasma; hydrodynamic sheath; plasma-sheath interface; plasma-sheath transition; space-charge effect; Boundary conditions; Electrons; Frequency; Hydrodynamics; Ionization; Plasma density; Plasma properties; Plasma sheaths; Plasma temperature; Road accidents;
Journal_Title :
Plasma Science, IEEE Transactions on