FIZIKA A 16 (2007) 2 , 79-90

THE PHYSICAL PROBLEM AND THE MODELLING OF THE SHEATH IN COLLISIONAL DUSTY PLASMA

M. EDDAHBY^a, M. SAMIR^a, A. DEZAIRI^a, D. SAIFAOUI^b, M. EL MOUDEN^b and O. EL HAITAMI^a
aLaboratoire de Physique de la Matière Condensée,
Faculté des Sciences Ben M'sik, B.P. 7955, Casablanca, Maroc
^bLaboratoire de Physique Théorique, B.P. 5366 Maarif, Groupe de Physique des Plasmas,
Faculté des Sciences Ain chock, Casablanca, Maroc

Received 27 June 2006;  Revised manuscript received 7 April 2007
Accepted 4 July 2007  Online 24 September 2007

The aim of this paper is to study the behaviour of sheath structure in plasma with collisions, and simulation of the effects of collisionality on the plasma sheath using the Runge-Kutta routine. We consider the near-wall region of an unmagnetized dusty plasma which consists of electrons, ions, micron-size dust particles and neutral particles. Since the dust particles are much heavier than electrons and ions, the latter are assumed to be out of thermal equilibrium with dust as a cold fluid. The neutrals are taken as immobile. Precise numerical solutions of the model are used to determine the collisional dependence of the sheath width and the impact energy at the wall.

PACS numbers: 52.40.Kh, 52.27.Lw, 52.27.Cm
UDC 533.95, 533.93

Keywords: sheath, dusty plasma, sheath width, collisional parameter, impact energy

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