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Title: Studies of Reynolds stress and the turbulent generation of edge poloidal flows on the HL-2A tokamak

Abstract

Several new results on the physics linking edge poloidal flows to turbulent momentum transport are reported. These are based on experiments on the HL-2A tokamak. Significant deviation from the neoclassical prediction for mean poloidal flow in Ohmic and electron cyclotron resonance heating (ECRH) heated L-mode discharges is derived from direct measurement of the turbulent Reynolds stress. The deviation increases prominently with ECRH power. The turbulent poloidal viscosity is synthesized from fluctuation data, and is found to be comparable to the turbulent particle diffusivity. The intrinsic poloidal torque characterized by the divergence of the non-diffusive residual stress is deduced from synthesis for the first time in a tokamak plasma. Experimental evidence which demonstrates the dynamics of spectral symmetry breaking in drift wave turbulence is in good agreement with the development of the poloidal torque. Finally, taken together, these results elucidate the connections between power injection, turbulence development, pressure gradient and residual stress from symmetry breaking.

Authors:
ORCiD logo [1]; ORCiD logo [2];  [1]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1];  [1]
  1. Southwestern Inst. of Physics, Chengdu (China)
  2. Univ. of California, San Diego, CA (United States)
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24); National Natural Science Foundation of China (NNSFC)
Contributing Org.:
HL-2A Team
OSTI Identifier:
1558406
Grant/Contract Number:  
FG02-04ER54738; 1575055; 11875124; 11705052; U1867222; 2015GB104003; 2015GB120002
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 59; Journal Issue: 10; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; tokamak, turbulent transport, poloidal flows, Langmuir probe

Citation Formats

Long, T., Diamond, P. H., Xu, M., Ke, R., Nie, L., Li, B., Wang, Z. H., Xu, J. Q., and Duan, X. R. Studies of Reynolds stress and the turbulent generation of edge poloidal flows on the HL-2A tokamak. United States: N. p., 2019. Web. doi:10.1088/1741-4326/ab33cf.
Long, T., Diamond, P. H., Xu, M., Ke, R., Nie, L., Li, B., Wang, Z. H., Xu, J. Q., & Duan, X. R. Studies of Reynolds stress and the turbulent generation of edge poloidal flows on the HL-2A tokamak. United States. doi:10.1088/1741-4326/ab33cf.
Long, T., Diamond, P. H., Xu, M., Ke, R., Nie, L., Li, B., Wang, Z. H., Xu, J. Q., and Duan, X. R. Mon . "Studies of Reynolds stress and the turbulent generation of edge poloidal flows on the HL-2A tokamak". United States. doi:10.1088/1741-4326/ab33cf.
@article{osti_1558406,
title = {Studies of Reynolds stress and the turbulent generation of edge poloidal flows on the HL-2A tokamak},
author = {Long, T. and Diamond, P. H. and Xu, M. and Ke, R. and Nie, L. and Li, B. and Wang, Z. H. and Xu, J. Q. and Duan, X. R.},
abstractNote = {Several new results on the physics linking edge poloidal flows to turbulent momentum transport are reported. These are based on experiments on the HL-2A tokamak. Significant deviation from the neoclassical prediction for mean poloidal flow in Ohmic and electron cyclotron resonance heating (ECRH) heated L-mode discharges is derived from direct measurement of the turbulent Reynolds stress. The deviation increases prominently with ECRH power. The turbulent poloidal viscosity is synthesized from fluctuation data, and is found to be comparable to the turbulent particle diffusivity. The intrinsic poloidal torque characterized by the divergence of the non-diffusive residual stress is deduced from synthesis for the first time in a tokamak plasma. Experimental evidence which demonstrates the dynamics of spectral symmetry breaking in drift wave turbulence is in good agreement with the development of the poloidal torque. Finally, taken together, these results elucidate the connections between power injection, turbulence development, pressure gradient and residual stress from symmetry breaking.},
doi = {10.1088/1741-4326/ab33cf},
journal = {Nuclear Fusion},
number = 10,
volume = 59,
place = {United States},
year = {2019},
month = {8}
}

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