Relaxed states for Ohmically driven tokamaks with an arbitrary aspect ratio

The principle of minimum dissipation was used to explore the relaxed state of plasma in Ohmically driven tokamaks. Different typical minimum states existed for low and general aspect ratio tokamak and the Euler-Lagrange equations were solved analytically and numerically. Different types of relaxed states were observed in the different regions of the parameter space for a selected device. The results show the existence of a key parameter E _o/ηB in determining the final relaxed states and the evolution of typical minimum dissipation state to other forms of states by increasing the E _o/ηB _o.