Arbitrary amplitude dust ion acoustic solitary waves and double layers in a plasma with non-thermal electrons

Abstract

Sagdeev’s pseudo potential method is employed to study dust ion-acoustic solitary waves in an unmagnetized plasma with non-thermal electrons. An exact analytical expression is obtained for the pseudo potential. The range of parameters for the existence of solitary waves and double layers using the analytical expression of the Sagdeev potential has been found. It is observed that, depending on the values of the plasma parameters like ion temperature <img src='http://www.niscair.res.in/jinfo/sigma1.gif' border=0>, non-thermal electron parameter <i><img src='http://www.niscair.res.in/jinfo/Beta.gif' border=0></i> and the value of the dust grain charge <i style="">µZ_d</i>, both rarefactive and compressive solitary waves may exist. Critical values of these parameters, beyond which solitary waves would cease to exist, are obtained for some particular cases. Double layer solutions are also obtained for certain parametric values. Exact numerical results are obtained for arbitrary amplitude solitons and double layers.