Databases of plasmas confined by stellarator type devices have been gradually accumulated from recent experiments and several confinement scalings have been presented. Based on these confinement scalings, dependences among parameters of possible stellarator-type reactors are analysed to find the sensitivity of the scale of the reactors to parameters. When confinement time follows ISS95 scaling and LHD scaling, confinement enhancement factors of HISS95 = 3-4 and HLHD ~ 4 are required, respectively, for stellarator type reactors with plasma radius less than 2 m. When confinement time follows W7AS scaling, a confinement enhancement factor of HW7AS = 2-3 is necessary.
ITER plasma performance assessment on the basis of newly-proposed scalings