Field-Line Localized Destabilization of Ballooning Modes in Three-Dimensional Tokamaks

Willensdorfer, M.; Cote, T. B.; Hegna, C. C.; Suttrop, W.; Zohm, H.; Dunne, M.; Strumberger, E.; Birkenmeier, G.; Denk, S. S.; Mink, F.; Vanovac, B.; Luhmann, L. C.

doi:10.1103/PhysRevLett.119.085002

Title: Field-Line Localized Destabilization of Ballooning Modes in Three-Dimensional Tokamaks

Journal Article · Fri Aug 25 00:00:00 EDT 2017 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.119.085002· OSTI ID:1376933

Willensdorfer, M.; Cote, T. B.; Hegna, C. C.; Suttrop, W.; Zohm, H.; Dunne, M.; Strumberger, E.; Birkenmeier, G.; Denk, S. S.; Mink, F.; Vanovac, B.; Luhmann, L. C.

Field-line localized ballooning modes have been observed at the edge of high confinement mode plasmas in ASDEX Upgrade with rotating 3D perturbations induced by an externally applied n ¼ 2 error field and during a moderate level of edge localized mode mitigation. The observed ballooning modes are localized to the field lines which experience one of the two zero crossings of the radial flux surface displacement during one rotation period. The localization of the ballooning modes agrees very well with the localization of the largest growth rates from infinite-n ideal ballooning stability calculations using a realistic 3D ideal magnetohydrodynamic equilibrium. This analysis predicts a lower stability with respect to the axisymmetric case. The primary mechanism for the local lower stability is the 3D distortion of the local magnetic shear.

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Research Organization:: Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: the ASDEX Upgrade Team

Grant/Contract Number:: FG02-86ER53218

OSTI ID:: 1376933

Alternate ID(s):: OSTI ID: 1424747

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Vol. 119 Journal Issue: 8; ISSN 0031-9007

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 25 works

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