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Global Theory of Microtearing Modes in the Tokamak Pedestal.
Larakers, J L; Curie, M; Hatch, D R; Hazeltine, R D; Mahajan, S M.
Affiliation
  • Larakers JL; Institute for Fusion Studies, University of Texas, Austin, Texas 78712, USA.
  • Curie M; Institute for Fusion Studies, University of Texas, Austin, Texas 78712, USA.
  • Hatch DR; Institute for Fusion Studies, University of Texas, Austin, Texas 78712, USA.
  • Hazeltine RD; Institute for Fusion Studies, University of Texas, Austin, Texas 78712, USA.
  • Mahajan SM; Institute for Fusion Studies, University of Texas, Austin, Texas 78712, USA.
Phys Rev Lett ; 126(22): 225001, 2021 Jun 04.
Article in En | MEDLINE | ID: mdl-34152172
ABSTRACT
The pedestal of H-mode tokamaks displays strong magnetic fluctuations correlated with the evolution of the electron temperature. The microtearing mode (MTM), a temperature-gradient-driven instability that alters magnetic topology, is compatible with these observations. Here we extend the conventional theory of the MTM to include the global variation of the temperature and density profiles. The offset between the rational surface and the location of the pressure gradient maximum (µ) emerges as a crucial parameter for MTM stability. The extended theory matches observations on the Joint European Torus tokamak.

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2021 Document type: Article Affiliation country: United States

Full text: 1 Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2021 Document type: Article Affiliation country: United States