Transport in a stellarator with imperfect flux surfaces and quasisymmetry

With the use of techniques developed in Refs. 1 it is possible to study low shear stellarator steady states. A steady state near a magnetic field with flux surfaces and approximate quasisymmetry is modified by the addition of small magnetic fields restricted only by the condition that the perturbation preserve the underlying stellarator symmetry. The perturbations constrain the profile functions of the electrons and ions. Equations for the profile functions are given and a simple model of a linearized collision operator is used to obtain further results. \\[4pt] [1] Phys. Plasmas 1, 3942 (1994); 4, 575 (1997); and 5, 417 (1998).