Edge-Localized Mode

Edge-Localized Mode

Definition

An Edge-Localized Mode ("ELM") is a disruptive instability occurring in the edge region of a tokamak plasma due to the quasi-periodic relaxation of a transport barrier previously formed during an L --> H transition.This phenomenon was first observed in the ASDEX tokamak in 1981. [Wagner, F. "et al" (1982). Recent results of H-mode studies on ASDEX, Proceedings of the Thirteenth Conference on Plasma Physics and Controlled Nuclear Fusion Research (IAEA, Vienna), vol. I, pp. 277-90.]

Impact

The development of edge-localized modes poses a major challenge in magnetic fusion research with tokamaks, as these instabilities can damage parts of the tokamak exposed to their extremely (high pressure, high energy, and temperature)? (believe divertors to be damaged parts, but not sure what diverters do?)...

Research is underway as to how to prevent formation of edge localized modes. A paper was recently published that suggested a novel method of countering this phenomenon by injecting (electrical? electromagnetic?) noisy energy into the containment field as a containment-stabilization regime; apparently, this decreases ELM succeptability.

References

ee also

* Plasma instability
* Tokamak


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