Hysteresis as a probe of turbulent bifurcation in intrinsic rotation reversals on Alcator C-Mod

Cao, N. M.; Rice, J. E.; Diamond, P. H.; White, A. E.; Baek, S. G.; Chilenski, M. A.; Hughes, J. W.; Irby, J.; Reinke, M. L.; Rodriguez-Fernandez, P.

doi:10.1088/1741-4326/ab3b38

Hysteresis as a probe of turbulent bifurcation in intrinsic rotation reversals on Alcator C-Mod

Journal Article · Thu Aug 29 00:00:00 EDT 2019 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/ab3b38· OSTI ID:1560064

^[1]; ^[2]; ^[3]; White, A. E. ^[2]; Baek, S. G. ^[2]; ^[2]; ^[2]; Irby, J. ^[2]; Reinke, M. L. ^[4]; ^[2]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); UC San Diego
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Univ. of California, San Diego, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Analysis and modeling of a new set of rotation reversal hysteresis experiments unambiguously show that changes in turbulence are responsible for the intrinsic rotation reversal and the linear to saturated ohmic confinement (LOC/SOC) transition on Alcator C-Mod. Plasmas on either side of the reversal exhibit different toroidal rotation profiles and therefore different turbulence characteristics despite profiles of density and temperature that are indistinguishable within measurement uncertainty. The deactivation of subdominant (in linear growth rate and heat transport) ion-temperature gradient and trapped electron mode-like instabilities in a mixedmode state is identified as the only possible change in turbulence within a quasilinear transport approximation across the reversal which is consistent with the measured profiles and the inferred heat and particle fluxes. This indicates an explanation for the LOC/SOC transition that provides a mechanism for hysteresis through the dynamics of subdominant modes and changes in their relative populations, and does not involve a change in most (linearly) unstable ion-scale drift-wave instability.

View Accepted Manuscript (DOE)

Research Organization:: UC San Diego

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

Contributing Organization:: the Alcator C-Mod Team

Grant/Contract Number:: FG02-04ER54738

OSTI ID:: 1560064

Alternate ID(s):: OSTI ID: 22929946

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 10 Vol. 59; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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