In a tokamak plasma, for example, an ohmic transformer is used to inductively drive current. In this scenario, is it simply assumed that the electrons are mobile and driving all the current in a particular direction while the ions are essentially stationary? Or is there a more accurate model that takes the ions to move in one direction and the electrons in another toroidally? Or are they both moving in one direction toroidally, but the electrons simply at a greater speed? I realize the concept of toroidal and poloidal flows in tokamak plasmas is a deep topic, but could still not find a simple explanation of how ohmic transformers affect the flow of electrons and ions individually.
This picture above would certainly change for other forms of current drive (e.g. lower hybrid, neutral beams).