ION-ACOUSTIC DOUBLE-LAYERS IN A MAGNETIZED PLASMA IN THE PRESENCE OF IMPURITY IONS

We present here an analytic solution for small amplitude ion acoustic double layers in a magnetized plasma consisting of mobile impurity ion s, hot background electrons and ions. Considering the fluid equations to describe the impurity ions and Boltzmann equation of state for both electrons and ions we derive a linear dispersion relation and investi gate the existence of small amplitude double layer solution. We show t hat double layer solutions can be obtained for both positively and neg atively charged impurity ions.