Observation of floating potential asymmetry in the edge plasma of the SINPtokamak

Edge plasma properties in a tokamak is an interesting subject of study from the view point of confinement and stability of tokamak plasma. The edge pl asma of SINP-tokamak has been investigated using specially designed Langmui r probes. We have observed a poloidal asymmetry of floating potentials, par ticularly the top-bottom floating potential differences are quite noticeabl e, which in turn produces a vertical electric field (E-v). This E-v remains throughout the discharge but changes its direction at certain point of tim e which seems to depend on applied vertical magnetic field (B-v).