Alcusón Belloso, Jorge AlbertoReynolds Barredo, José MiguelBustos Molina, Andrés deSánchez Fernández, Luis RaúlTribaldos Macía, VíctorXanthopoulos, PavlosGoerler, T.Newman, D.E.2022-09-122022-09-122016-10-01Alcuson, J. A., Reynolds-Barredo, J. M., Bustos, A., Sanchez, R., Tribaldos, V., Xanthopoulos, P., Goerler, T., & Newman, D. E. (2016). Quasi-symmetry and the nature of radial turbulent transport in quasi-poloidal stellarators. In Physics of Plasmas, 23(10), 102308.1070-664Xhttps://hdl.handle.net/10016/35666Quasi-symmetric configurations have a better neoclassical confinement compared to that of standard stellarators. The reduction of the neoclassical viscosity along the direction of quasi-symmetry should facilitate the self-generation of zonal flows and, consequently, the mitigation of turbulent fluctuations and the ensuing radial transport. Therefore, it is expected that quasi-symmetries should also result in better confinement properties regarding radial turbulent transport. In this paper we show that, at least for quasi-poloidal configurations, the influence of quasi-symmetry on radial transport exceeds the expected reduction of fluctuation levels and associated effective transport coefficients, and that the intimate nature of transport itself is affected. In particular, radial turbulent transport becomes increasingly subdiffusive as the degree of quasi-symmetry becomes larger. This behavior is somewhat reminiscent of what has been previously reported in tokamaks with strong radially sheared zonal flows. Published by AIP Publishing.eng© 2016 Author(s). Published by AIP Publishing.PhysicsModelresearch articleFísicahttps://doi.org/10.1063/1.4965231open access10230810PHYSICS OF PLASMAS23AR/0000018451