Title :
Transition from plasma to space-charge sheath near the electrode in electrical discharges
Author :
Keidar, Michael ; Beilis, Isak I.
Author_Institution :
Dept. of Aerosp. Eng., Univ. of Michigan, Ann Arbor, MI, USA
Abstract :
Joined solutions of quasi-neutral collisional plasma (presheath) and space-charge collisionless sheath is obtained in a hydrodynamic approximation taking into account nonzero electric field at the sheath edge. Separate calculation of these two regions is performed and the procedure for obtaining smooth solution is formulated. The procedure is based on proper selection of boundary conditions which are the ion velocity and the electric field at the plasma-sheath interface. The dependencies of the ion velocity and electric field at the interface on the Debye length to the collision mean free path ratio are calculated.
Keywords :
discharges (electric); plasma boundary layers; plasma collision processes; plasma sheaths; plasma transport processes; space charge; Debye length; collision mean free path; electric field; electrical discharges; electrode; hydrodynamic approximation; ion velocity; plasma sheath; quasineutral collisional plasma; sheath edge; space-charge sheath; Boundary conditions; Electrodes; Helium; Hydrodynamics; Kinetic theory; Plasma accelerators; Plasma properties; Plasma sheaths; Plasma temperature; Space charge; Collision; Debye length; electric field; ion velocity; mean free path; patching; quasi-neutral plasma; sheath; space charge;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2005.856484
