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Title: A quasi-linear analysis of the impurity effect on turbulent momentum transport and residual stress

Abstract

We study the impact of impurities on turbulence driven intrinsic rotation (via residual stress) in the context of the quasi-linear theory. A two-fluid formulation for main and impurity ions is employed to study ion temperature gradient modes in sheared slab geometry modified by the presence of impurities. An effective form of the parallel Reynolds stress is derived in the center of mass frame of a coupled main ion-impurity system. Analyses show that the contents and the radial profile of impurities have a strong influence on the residual stress. In particular, an impurity profile aligned with that of main ions is shown to cause a considerable reduction of the residual stress, which may lead to the reduction of turbulence driven intrinsic rotation.

Authors:
;  [1]
  1. National Fusion Research Institute, Daejeon 305-333 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22490046
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 8; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ION TEMPERATURE; PLASMA IMPURITIES; RESIDUAL STRESSES; REYNOLDS NUMBER; ROTATING PLASMA; SHEAR; SLABS; TEMPERATURE GRADIENTS; TURBULENCE

Citation Formats

Ko, S. H., E-mail: shko@nfri.re.kr, Jhang, Hogun, and Singh, R. A quasi-linear analysis of the impurity effect on turbulent momentum transport and residual stress. United States: N. p., 2015. Web. doi:10.1063/1.4927779.
Ko, S. H., E-mail: shko@nfri.re.kr, Jhang, Hogun, & Singh, R. A quasi-linear analysis of the impurity effect on turbulent momentum transport and residual stress. United States. https://doi.org/10.1063/1.4927779
Ko, S. H., E-mail: shko@nfri.re.kr, Jhang, Hogun, and Singh, R. 2015. "A quasi-linear analysis of the impurity effect on turbulent momentum transport and residual stress". United States. https://doi.org/10.1063/1.4927779.
@article{osti_22490046,
title = {A quasi-linear analysis of the impurity effect on turbulent momentum transport and residual stress},
author = {Ko, S. H., E-mail: shko@nfri.re.kr and Jhang, Hogun and Singh, R.},
abstractNote = {We study the impact of impurities on turbulence driven intrinsic rotation (via residual stress) in the context of the quasi-linear theory. A two-fluid formulation for main and impurity ions is employed to study ion temperature gradient modes in sheared slab geometry modified by the presence of impurities. An effective form of the parallel Reynolds stress is derived in the center of mass frame of a coupled main ion-impurity system. Analyses show that the contents and the radial profile of impurities have a strong influence on the residual stress. In particular, an impurity profile aligned with that of main ions is shown to cause a considerable reduction of the residual stress, which may lead to the reduction of turbulence driven intrinsic rotation.},
doi = {10.1063/1.4927779},
url = {https://www.osti.gov/biblio/22490046}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 8,
volume = 22,
place = {United States},
year = {Sat Aug 15 00:00:00 EDT 2015},
month = {Sat Aug 15 00:00:00 EDT 2015}
}