Magnetic Surfaces and Drift Surfaces of Average Minimum B Stellarator Field. II

Abstract

Dependence of various quantities (rotational transform angle, shear, magnetic well depth) of average minimum B field of stellarator type on the geometrical parameters of the current configurations and the possible ranges of the values of these quantities are studied. These results are compared with computed ones.
A condition on the Larmor radius of ion and the rotational transform angle is obtained for the smallness of deviation between drift surface and the magnetic one.
The effects of geometrical errors of the current configurations on the magnetic surface are analysed numerically and a tolerance limit of error is deduced.