Origin of the inversion of up-down potential asymmetry in the magnetized toroidal plasma

The up-down potential asymmetry in the toroidal magnetic plasma is caused b y the separation of ions and electrons due to the toroidicity of the confin ing magnetic field and/or due to the effect of flow along the vertical magn etic field. In the SINP tokamak an interesting phenomenon of inversion of u p-down asymmetry during a discharge has been observed experimentally. The o rigin of this up-down potential asymmetry and its inversion is attributed t o two oppositely directed vertical velocities, causing the separation of ch arged species.