A Gyrokinetik Vlasov code for the study of the charge separation at a plasma edge

The existence and time evolution of a charge separation at a plasma edge is studied using a code in which both ions and electrons are described by three-dimensional (3D) gyro-kinetic equations that include the finite Larmor-radius correction and the polarization drift. The ions finite Larmor radius allows the existence of a charge separation between ions and electronics, and the polarization drift, which has opposite signs for ions and electrons, has a tendency to accentuate the charge separation in a time-varying electric field and in the presence of strong gradients. We present the results obtained for the case of a 3D layer, in which z represents the toroidal periodic direction, x represents the poloidal periodic direction and y represents the radial direction. The magnetic field is located in the x-z plane, very close to the toroidal direction z, and makes an angle 0= 89.5"o with the x-axis.