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

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.
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1] ;  [3] ;  [3] ;  [1] ;  [4] ;  [5]
  1. Max Planck Society, Garching (Germany). Max Planck Inst. for Plasma Physics
  2. Univ. of Wisconsin, Madison, WI (United States)
  3. Max Planck Society, Garching (Germany). Max Planck Inst. for Plasma Physics; Technische Univ. Munchen, Garching (Germany). Dept. Physik
  4. Dutch Inst. for Fundamental Energy Research, Eindhoven (Netherlands)
  5. Univ. of California, Davis, CA (United States)
Publication Date:
Grant/Contract Number:
FG02-86ER53218
Type:
Published Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 119; Journal Issue: 8; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
the ASDEX Upgrade Team
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
OSTI Identifier:
1376933
Alternate Identifier(s):
OSTI ID: 1424747

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., and Luhmann, L. C.. Field-Line Localized Destabilization of Ballooning Modes in Three-Dimensional Tokamaks. United States: N. p., Web. doi:10.1103/PhysRevLett.119.085002.
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 Destabilization of Ballooning Modes in Three-Dimensional Tokamaks. United States. doi:10.1103/PhysRevLett.119.085002.
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., and Luhmann, L. C.. 2017. "Field-Line Localized Destabilization of Ballooning Modes in Three-Dimensional Tokamaks". United States. doi:10.1103/PhysRevLett.119.085002.
@article{osti_1376933,
title = {Field-Line Localized Destabilization of Ballooning Modes in Three-Dimensional Tokamaks},
author = {Willensdorfer, M. and Cote, T. B. and Hegna, C. C. and Suttrop, W. and Zohm, H. and Dunne, M. and Strumberger, E. and Birkenmeier, G. and Denk, S. S. and Mink, F. and Vanovac, B. and Luhmann, L. C.},
abstractNote = {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.},
doi = {10.1103/PhysRevLett.119.085002},
journal = {Physical Review Letters},
number = 8,
volume = 119,
place = {United States},
year = {2017},
month = {8}
}