Characteristics of type I and type III ELM precursors in ASDEX Upgrade

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Euratom Assoc, Garching, Germany [1 ]
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Nucl Fusion | / 1卷 / 111-116期
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Kinetic energy - Plasma diagnostics - Plasma oscillations - Plasma turbulence;
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摘要：
The temporal evolution of the edge electron pressure gradient during the development of a type I ELM shows that proximity of Pedge to the ideal ballooning limit is not sufficient to trigger a type I ELM. Thus, the MHD structure of ELMs is investigated further. The present discussion focuses on the phenomenology of type I and type III ELM precursors. The ELM precursor types are well distinguished by their frequency behaviour and mode structure. The type I ELM precursor oscillation originates from a thin layer close to the plasma edge. For type III ELMs, on the contrary, Pedge has a much stronger influence as indicated by their occurrence during L mode.
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