Abstract
AbstractThe observation of the H‐mode and ELMs in helical devices confirms the generic character of these phenomena in toroidal confinement. Particularities are the strong impact of the magnetic edge configuration on transition and ELM phenomenology and the existence of a mean E × B flow shear already predefined by the condition given from the neoclassical fluxes. The observations indicate that the classical H‐mode as a bifurcation phenomenon possibly associated with dynamic sheared flows is biased by these equilibrium mean shear flow conditions of the 3D plasma edge. Besides this classical H‐mode other Edge Transport Barriers can be realized which are related to the development a mean shear flow on a transport timescale (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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