Global Theory of Microtearing Modes in the Tokamak Pedestal

Larakers, J. L.; Curie, M.; Hatch, D. R.; Hazeltine, R. D.; Mahajan, S. M.

doi:10.1103/physrevlett.126.225001

Global Theory of Microtearing Modes in the Tokamak Pedestal

Journal Article · Fri Jun 04 00:00:00 EDT 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.126.225001· OSTI ID:1785986

^[1]; ^[2]; Hatch, D. R. ^[2]; Hazeltine, R. D. ^[2]; Mahajan, S. M. ^[2]

Univ. of Texas, Austin, TX (United States); University of Texas at Austin
Univ. of Texas, Austin, TX (United States)

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. In conclusion, the extended theory matches observations on the Joint European Torus tokamak.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Texas, Austin, TX (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-04ER54742

OSTI ID:: 1785986

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 22 Vol. 126; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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