Self-adjusting mechanism and plasma dynamo in a reversed field pinch

Equilibrium of the STP-3(M) reversed field pinch was studied by changing the discharge conditions. With increasing the magnetic Reynolds number, the values of field reversal ratio, F and pinch parameter, theta, tend to be kept constant by the self adjusting mechanism which is closely related to the plasma dynamo generating the toroidal flux. When only the Ohmic input power was controlled, this self adjusting mechanism keeps the value of inductive volt second divided by the toroidal flux constant and prohibits the plasma from attaining the helical equilibrium state.