Author： Peer J Kendl A Scott B D
Publisher： IOP Publishing
ISSN： 0741-3335
Source： Plasma Physics and Controlled Fusion, Vol.55, Iss.1, 2013-01, pp. : 15002-15013
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Abstract
The magnetic field structure associated with edge localized ideal ballooning mode bursts is analysed by nonlinear gyrofluid computation. The linear growth phase is characterized by the formation of small-scale magnetic islands. Ergodic magnetic field regions develop near the end of the linear phase when the instability starts to perturb the equilibrium profiles. The nonlinear blow-out gives rise to an ergodization of the entire edge region. The time-dependent level of ergodicity is determined in terms of the mean radial displacement of a magnetic field line. The ergodicity decreases again during the nonlinear turbulent phase of the blow-out in dependence on the degrading plasma beta in the collapsing plasma pedestal profile.
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