Characterization and interpretation of the Edge Snake in between type-I edge localized modes at ASDEX Upgrade

F. Sommer, S. Günter, A. Kallenbach, M. Maraschek, J.E. Boom, R. Fischer, N. Hicks, N.C. Luhmann, H.K. Park, B. Reiter, R. Wenninger, E. Wolfrum

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Samenvatting

A new magnetohydrodynamic instability called the 'Edge Snake', which was found in 2006 at the tokamak ASDEX Upgrade during type-I ELMy H-modes, is investigated. It is located within the separatrix in the region of high temperature and density gradients and has a toroidal mode number of n = 1. The Edge Snake consists of a radially and poloidally strongly localized current wire, in which the temperature and density profiles flatten. This significant reduction in pressure gradient leads to a reduction in the neoclassical Bootstrap current and can plausibly explain the drive of the instability. The experimental observations point towards a magnetic island with a defect current inside the O-point of the island. The Edge Snake is compared with similar instabilities at JET, DIII-D and ASDEX Upgrade.
Originele taal-2Engels
Artikelnummer085012
Pagina's (van-tot)085012-1/13
Aantal pagina's13
TijdschriftPlasma Physics and Controlled Fusion
Volume53
Nummer van het tijdschrift8
DOI's
StatusGepubliceerd - 2011

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