In a simple one-fluid cylindrical model of transport and of dissipative effects, the family of the magnetic states of the Tokamak which correspond to a vanishing entropy production in the confinement region (according to the configurational magnetic entropy introduced in previous work) is characterized by a define relation or 'state equation' involving the relevant parameters of the discharge. The author investigates how the entropy production changes when the current density profile is rearranged by a perturbation which conserves the poloidal magnetic flux. It is shown that for a sufficiently short time interval, that is to say t2<展开▼
