A Conceptual Model for the Nonlinear Dynamics of Edge-localized Modes in Tokamak Plasmas

Evans, T.E.; Wingen, A.; Watkins, J.G.; Spatschek, K. H.

doi:10.5772/6944

Cited by 1 publication

(2 citation statements)

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“…In discharge 133908, the secondary X-point is very close to the primary separatrix, about 10.5 cm, so that the connection to the upper targets is established easily. Only about 150 A initial current is necessary to form the first large tube [15,20].…”

Section: Self-amplification In the Large Distance Regimementioning

confidence: 99%

“…A conceptual electromagnetic model, which interprets the dynamics of the edge plasma and the evolution of the pedestal magnetic topology following the linear growth phase of a peeling-ballooning instability, was proposed [14,15] and numerically implemented [16]. The model assumes that thermoelectric currents are driven in the plasma edge by the heat delivered to the target plates during the plasma pedestal collapse.…”

Section: Introductionmentioning

confidence: 99%

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Dependence of a current driven ELM self-amplification process on the plasma shape

2012

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The numerical model of the non-linear evolution of edge-localized modes (ELMs) in tokamaks being used in this paper assumes that thermoelectric currents flow in short connection length flux tubes, initially established by error fields or other non-axisymmetric magnetic perturbations. The additional magnetic perturbation of the current filaments changes the magnetic topology. In a self-amplification process, more flux tubes are created which eventually allow more thermoelectric current to flow through the plasma edge. The process of flux tube formation is highly sensitive to the position of the secondary X-point in typical single null discharges in DIII-D. A new scenario for cases with large distances Δs between the secondary X-point and the primary separatrix is presented. In the numerical simulations, as Δs is increased the current evolution through short connection length flux tubes changes significantly. Ultimately, a final state with large stripe structures is found that results in footprints on the vessel wall which are similar to those found when Δs is small (Wingen et al 2010 Phys. Rev. Lett. 104 175001).

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Section: Self-amplification In the Large Distance Regimementioning

confidence: 99%