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

Abstract

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 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.<

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Wisconsin, Madison, WI (United States)
  2. Univ. of California, Los Angeles, CA (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1631960
Alternate Identifier(s):
OSTI ID: 1631774
Grant/Contract Number:  
FC02-04ER54698; FG02-08ER54999; SC0001288
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 27; Journal Issue: 6; Conference: 61. Annual Meeting of the APS Division of Plasma Physics, Fort Lauderdale, FL (United States), 21-25 Oct 2019; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Kriete, David M., McKee, George R., Schmitz, Lothar, Smith, D. R., Yan, Z., Morton, L. A., and Fonck, R. J. Effect of magnetic perturbations on turbulence-flow dynamics at the L-H transition on DIII-D. United States: N. p., 2020. Web. doi:10.1063/1.5145207.
Kriete, David M., McKee, George R., Schmitz, Lothar, Smith, D. R., Yan, Z., Morton, L. A., & Fonck, R. J. Effect of magnetic perturbations on turbulence-flow dynamics at the L-H transition on DIII-D. United States. doi:https://doi.org/10.1063/1.5145207
Kriete, David M., McKee, George R., Schmitz, Lothar, Smith, D. R., Yan, Z., Morton, L. A., and Fonck, R. J. Wed . "Effect of magnetic perturbations on turbulence-flow dynamics at the L-H transition on DIII-D". United States. doi:https://doi.org/10.1063/1.5145207.
@article{osti_1631960,
title = {Effect of magnetic perturbations on turbulence-flow dynamics at the L-H transition on DIII-D},
author = {Kriete, David M. and McKee, George R. and Schmitz, Lothar and Smith, D. R. and Yan, Z. and Morton, L. A. and Fonck, R. J.},
abstractNote = {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 ∇ 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.<},
doi = {10.1063/1.5145207},
journal = {Physics of Plasmas},
number = 6,
volume = 27,
place = {United States},
year = {2020},
month = {6}
}

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