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. Gohil et al., Nucl. Fusion 51, 103020 (2011)] in ITER-relevant, low rotation, ITER-similar-shape plasmas with favorable ion direction. RMPs simultaneously raise the turbulence decorrelation rate and reduce the flow shear rate 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 . 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 , do not affect and only slightly reduce and Reynolds-stress-driven energy transfer.<
- Authors:
-
- Univ. of Wisconsin, Madison, WI (United States)
- 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. 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. https://doi.org/10.1063/1.5145207. https://www.osti.gov/servlets/purl/1631960.
@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 = {Wed Jun 03 00:00:00 EDT 2020},
month = {Wed Jun 03 00:00:00 EDT 2020}
}
Web of Science
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