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M. Hirsch, T. Akiyama, T. Estrada, T. Mizuuchi, K. Toi, C. Hidalgo
H-mode in Helical Devices
Date of publication:
22 IAEA Fusion Energy Conference, EXC/2-5Ra
L-H transitions and ELMs are observed in all helical devices if operated at relevant plasma conditions thus emphasizing the generic character of these phenomena in toroidal confinement. Particular for helical devices resembling 3D systems is, first, the strong dependency of the H-mode transition and the ELM phenomenology on the magnetic edge configuration and, second, the existence of a sheared radial electric field already before the transition predefined by the ambipolarity condition of the convective fluxes. These elements may constitute biasing preconditions for the spin-up to a high-rotation state.
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