Effect of magnetic perturbations on turbulence-flow dynamics at the L-H transition on DIII-D

Kriete, David M.; McKee, George R.; Schmitz, Lothar; Smith, D. R.; Yan, Z.; Morton, L. A.; Fonck, R. J.

doi:10.1063/1.5145207

Title: Effect of magnetic perturbations on turbulence-flow dynamics at the L-H transition on DIII-D

Journal Article · Wed Jun 03 00:00:00 EDT 2020 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5145207· OSTI ID:1631960

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Univ. of Wisconsin, Madison, WI (United States)
Univ. of California, Los Angeles, CA (United States)

Detailed 2D turbulence measurements from the DIII-D tokamak provide an explanation for how resonant magnetic perturbations (RMPs) raise the L-H power threshold $P_{LH}$ [P. Gohil et al., Nucl. Fusion 51, 103020 (2011)] in ITER-relevant, low rotation, ITER-similar-shape plasmas with favorable ion $\nabla B$ direction. RMPs simultaneously raise the turbulence decorrelation rate $Δ ω_{D}$ and reduce the flow shear rate $ω_{shear}$ in the stationary L-mode state preceding the L-H transition, thereby disrupting the turbulence shear suppression mechanism. RMPs also reduce the Reynolds stress drive for poloidal flow, contributing to the reduction of $ω_{shear}$ . On the ~100 μs timescale of the L-H transition, RMPs reduce Reynolds-stress-driven energy transfer from turbulence to flows by an order of magnitude, challenging the energy depletion theory for the L-H trigger mechanism. In contrast, non-resonant magnetic perturbations, which do not significantly affect $P_{LH}$ , do not affect $Δ ω_{D}$ and only slightly reduce $ω_{shear}$ and Reynolds-stress-driven energy transfer.<

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Research Organization:: General Atomics, San Diego, CA (United States); Univ. of Wisconsin, Madison, WI (United States)

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

Grant/Contract Number:: FC02-04ER54698; FG02-08ER54999; SC0001288

OSTI ID:: 1631960

Alternate ID(s):: OSTI ID: 1631774

Journal Information:: Physics of Plasmas, Vol. 27, Issue 6; Conference: 61. Annual Meeting of the APS Division of Plasma Physics, Fort Lauderdale, FL (United States), 21-25 Oct 2019; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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