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Title: Turbulence induced radial transport of toroidal momentum in boundary plasma of EAST tokamak

Abstract

Turbulence induced toroidal momentum transport in boundary plasma is investigated in H-mode discharge using Langmuir-Mach probes on EAST. The Reynolds stress is found to drive an inward toroidal momentum transport, while the outflow of particles convects the toroidal momentum outwards in the edge plasma. The Reynolds stress driven momentum transport dominates over the passive momentum transport carried by particle flux, which potentially provides a momentum source for the edge plasma. The outflow of particles delivers a momentum flux into the scrape-off layer (SOL) region, contributing as a momentum source for the SOL flows. At the L-H transitions, the outward momentum transport suddenly decreases due to the suppression of edge turbulence and associated particle transport. The SOL flows start to decelerate as plasma entering into H-mode. The contributions from turbulent Reynolds stress and particle transport for the toroidal momentum transport are identified. These results shed lights on the understanding of edge plasma accelerating at L-H transitions.

Authors:
 [1];  [2]; ; ; ; ; ; ; ; ; ;  [3];  [1]
  1. MOE Key Laboratory of Materials Modification by Beams, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China)
  2. (China)
  3. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 (China)
Publication Date:
OSTI Identifier:
22598986
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 6; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; H-MODE PLASMA CONFINEMENT; HT-7U TOKAMAK; LANGMUIR PROBE; MACH NUMBER; PARTICLES; PLASMA; PLASMA SCRAPE-OFF LAYER; REYNOLDS NUMBER; STRESSES; TRANSPORT THEORY; TURBULENCE

Citation Formats

Zhao, N., Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, Yan, N., E-mail: yanning@ipp.ac.cn, Xu, G. S., Wang, H. Q., Wang, L., Ding, S. Y., Chen, R., Chen, L., Zhang, W., Hu, G. H., Shao, L. M., and Wang, Z. X., E-mail: zxwang@dlut.edu.cn. Turbulence induced radial transport of toroidal momentum in boundary plasma of EAST tokamak. United States: N. p., 2016. Web. doi:10.1063/1.4953601.
Zhao, N., Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, Yan, N., E-mail: yanning@ipp.ac.cn, Xu, G. S., Wang, H. Q., Wang, L., Ding, S. Y., Chen, R., Chen, L., Zhang, W., Hu, G. H., Shao, L. M., & Wang, Z. X., E-mail: zxwang@dlut.edu.cn. Turbulence induced radial transport of toroidal momentum in boundary plasma of EAST tokamak. United States. doi:10.1063/1.4953601.
Zhao, N., Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, Yan, N., E-mail: yanning@ipp.ac.cn, Xu, G. S., Wang, H. Q., Wang, L., Ding, S. Y., Chen, R., Chen, L., Zhang, W., Hu, G. H., Shao, L. M., and Wang, Z. X., E-mail: zxwang@dlut.edu.cn. Wed . "Turbulence induced radial transport of toroidal momentum in boundary plasma of EAST tokamak". United States. doi:10.1063/1.4953601.
@article{osti_22598986,
title = {Turbulence induced radial transport of toroidal momentum in boundary plasma of EAST tokamak},
author = {Zhao, N. and Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 and Yan, N., E-mail: yanning@ipp.ac.cn and Xu, G. S. and Wang, H. Q. and Wang, L. and Ding, S. Y. and Chen, R. and Chen, L. and Zhang, W. and Hu, G. H. and Shao, L. M. and Wang, Z. X., E-mail: zxwang@dlut.edu.cn},
abstractNote = {Turbulence induced toroidal momentum transport in boundary plasma is investigated in H-mode discharge using Langmuir-Mach probes on EAST. The Reynolds stress is found to drive an inward toroidal momentum transport, while the outflow of particles convects the toroidal momentum outwards in the edge plasma. The Reynolds stress driven momentum transport dominates over the passive momentum transport carried by particle flux, which potentially provides a momentum source for the edge plasma. The outflow of particles delivers a momentum flux into the scrape-off layer (SOL) region, contributing as a momentum source for the SOL flows. At the L-H transitions, the outward momentum transport suddenly decreases due to the suppression of edge turbulence and associated particle transport. The SOL flows start to decelerate as plasma entering into H-mode. The contributions from turbulent Reynolds stress and particle transport for the toroidal momentum transport are identified. These results shed lights on the understanding of edge plasma accelerating at L-H transitions.},
doi = {10.1063/1.4953601},
journal = {Physics of Plasmas},
number = 6,
volume = 23,
place = {United States},
year = {Wed Jun 15 00:00:00 EDT 2016},
month = {Wed Jun 15 00:00:00 EDT 2016}
}