EFDA-JET-CP(10)05/25

Palm Trees and Islands ­ Current Filaments in the Edge of JET

It is now well known that ELMs lead to the ejection of a number of filamentary structures into the Scrape Off Layer (SOL). ELMs thus generate structures with excess energy and density. Recent results show also that the ELM filaments carry current. Furthermore it can be conjectured that ELM blobs leave corresponding holes behind. If such a hole is able to reach a resonant surface it closes on itself and increases its lifetime significantly. We presume that the Palm Tree Mode (PTM) is a signature of such an event. Understanding PTMs therefore enhances thus our knowledge of ELM and edge physics and contributes to the verification of ELM models.
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