On microinstabilities and turbulence in steep-gradient regions of fusion devices

Pueschel, M. J.; Hatch, D. R.; Ernst, D. R.; Guttenfelder, W.; Terry, P. W.; Citrin, J.; Connor, J. W.

doi:10.1088/1361-6587/aaf8c1

Title: On microinstabilities and turbulence in steep-gradient regions of fusion devices

Journal Article · Fri Feb 01 00:00:00 EST 2019 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/aaf8c1· OSTI ID:1512483

^[1];

^[2]; Ernst, D. R. ^[3];

^[4]; Terry, P. W. ^[5]; Citrin, J. ^[6]; Connor, J. W. ^[7]

Univ. of Texas at Austin, Austin, TX (United States); Univ. of Wisconsin-Madison, Madison, WI (United States)
Univ. of Texas at Austin, Austin, TX (United States)
MIT Plasma Science and Fusion Center, Cambridge, MA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Univ. of Wisconsin-Madison, Madison, WI (United States)
FOM Institute DIFFER, Eindhoven (The Netherlands)
Culham Science Centre, Oxon (United Kingdom)

Higher excitation states along the background field of plasma instabilities dominate over standard, ground-state eigenmodes once the gradient drive becomes sufficiently strong. At this point, mode parity can no longer be used as the sole identifier of microtearing activity. Not only ion- and electron-temperature-gradient-driven modes occur in higher states, but even trapped electron modes, where decorrelation mechanisms enable odd-parity mode structures without a vanishing bounce average. Nonlinearly, higher-order Hermite states imprint their structures on the turbulence. Even at considerably strong drive, however, quasilinear models can recover nonlinear fluxes, as long as all subdominantly unstable eigenmodes are included. Due to flux contributions from such modes, gradient scalings of fluxes can be stronger than linear expectations.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: 2013 Workshop on Impurity Transport, where the foundation for the present project was laid. Support was provided by the U.S. Department of Energy, Office of Science, Fusion Energy Sciences, under award Nos. DE-FG02-89ER53291 and DE-FG02-04ER-54742

Grant/Contract Number:: AC02-09CH11466; FG02-04ER-54742; FG02-89ER53291

OSTI ID:: 1512483

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 61, Issue 3; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 10 works

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Title: On microinstabilities and turbulence in steep-gradient regions of fusion devices

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