Oscillatory wake potential due to a moving test charge in multi-component dusty plasma

Summary form only given. A test charge moving through a dusty plasma produces a wake field potential in addition to the usual Debye-Huckel potential. The wake-field excited by a test charge moving through a multicomponent dusty plasma is calculated by using the Vlasov-Poisson model. The physics of the plasma is represented by the choice of the dielectric function. The dynamics of the charging of dust grains is taken into consideration. This leads to an enhanced shielding of a test charge. For low test charge velocities the grain charge can, to good approximation, be given using a delay operator and the charging term in the dielectric function is an exponential function of the frequency. At high velocities the charging term behaves as the inverse frequency. The potential response is then the sum of a damped dust acoustic mode and a shielded potential. In general both analytical and numerical methods are needed to analyze the form of the wake field potential