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In JT-60U, extensive plasma-neutral interaction during type I edge localized modes (ELMs) leads to a transient increase in the edge plasma density, seen as spikes of a few ms duration on the inner vertical interferometer channel (FIR1). The spikes can reach up to ~40% of the pre-ELM level of the FIR1 signal, in the case of giant ELMs. Fast edge measurements revealed that these density spikes are caused...
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