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We study the impact of impurities on turbulence driven intrinsic rotation(via residual stress) in the context of the quasi-linear theory. A two-fluidformulation for main and impurity ions is employed to study ion temperaturegradient modes in sheared slab geometry modified by the presence of impurities.An effective form of the parallel Reynolds stress is derived in the center ofmass frame of a coupled main ion-impurity system. Analyses show that thecontents and the radial profile of impurities have a strong influence on theresidual stress. In particular, an impurity profile aligned with that of mainions is shown to cause a considerable reduction of the residual stress, whichmay lead to the reduction of turbulence driven intrinsic rotation.

A quasi-linear analysis of the impurity effect on turbulent momentum transport and residual stress