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The microwave reflectometry system on ASDEX Upgrade measures density profiles (in broadband swept operation) and plasma fluctuations (fixed-frequency operation) both at the high-field side (HFS) and low-field side (LFS). Densities up to can be probed. We analyse the evolution of turbulence at the L-H transition and during the ELMy phase of H-mode discharges. The detailed density profile evolution during type I ELMs is resolved and profile oscillations associated with ELM precursors are studied.
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Manso et al. (1998) studied this question.
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