Confinement analysis of compact magnetic fusion configuration combined with tokamak and stellarator concepts

A compact plasma confinement configuration called TOKASTAR has been proposed combined with spherical tokamak and low-aspect-ratio stellarator systems. By adding helical filed to tokamaks, plasma start-up can be performed easily and the plasma current disruptions might be eliminated. In this TOKASTAR configuration, there is natural built-in divertor. According to the finite beta equilibrium analysis, the higher equilibrium beta value is attained by adding plasma current and increasing average rotational transform. (author)