Three-dimensional (3D) structures of physical variables in tokamak plasmas originate from a variety of sources such as error fields, non-axisymmetric fields by control coils, instability and so on. These 3D structures affect plasma rotation profiles through neoclassical toroidal viscosity, and the resultant rotation profiles affects penetration and suppression of the 3D structures. We have achieved a lot of understanding on them, including similarity and difference between tokamak and helical systems as well as reversed field pinches. Through the presentations and discussions on experiments, theoretical analyses and simulations, we will further achieve understandings on the behavior of and on how to control the 3D structures in plasmas and to improve transport properties.

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National Institute for Fusion Science