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Magnetic structure and frequency scaling of limit-cycle oscillations close to L- to H-mode transitions
2016
Nuclear Fusion
Limit-cycle oscillations (LCOs) close to the power threshold of L-to H-mode transitions are investigated in plasmas of ASDEX Upgrade. During this phase, referred to as I-phase, a strong magnetic activity in the poloidal magnetic fieldḂ θ with an up-down asymmetry is found. In some cases, the regular LCOs during I-phase transition smoothly into a phase with intermittent bursts which have similar properties to type-III edge localised modes (ELMs). Indications of precursors during the intermittent
doi:10.1088/0029-5515/56/8/086009
fatcat:xdmjzt7znbajbfpq6cm2mj34kq