The Reynolds stress induced by weakly up-down asymmetric ion temperature gradient mode

Xie, T.; Zhang, Y. Z.; Mahajan, S. M.; Liu, Z. Y.; He, Hongda

doi:10.1063/1.4966241

Title: The Reynolds stress induced by weakly up-down asymmetric ion temperature gradient mode

Journal Article · Mon Oct 31 00:00:00 EDT 2016 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4966241· OSTI ID:1535286

^[1]; Zhang, Y. Z. ^[2]; Mahajan, S. M. ^[3]; Liu, Z. Y. ^[4]; He, Hongda ^[5]

Sichuan Univ. of Science and Engineering, Zigong, Sichuan (China). School of Science
Chinese Academy of Sciences (CAS), Hefei, Anhui (China). Center for Magnetic Fusion Theory
Univ. of Texas, Austin, TX (United States). Inst. for Fusion Studies
Univ. of Science and Technology of China, Hefei, Anhui (China). Dept. of Modern Physics
Southwestern Inst. of Physics, Chengdu, Sichuan (China)

A weakly up-down asymmetric ion temperature gradient (ITG) mode (formed in the up-down symmetric equilibrium), localized in the bad curvature region, may contribute dominantly to the nonlinear Reynolds stress because its growth rate is higher than the competing modes: the strongly up-down asymmetric modes, and other modes peaked (poloidally) away from the outboard mid-plane. Based on the fluid ITG model, the parameterized analytic wave function is constructed in the two dimensional (2D) Fourier-ballooning representation, and numerically verified by making use of the finite difference methods. Analytic expressions for the poloidal Reynolds stresses, defined on a rational surface, are given for both the weakly and the strongly up-down asymmetric ITG modes. It is shown here that the poloidal stresses of both modes can be interpreted as a superposition of a monopole and a dipole structure. For comparison with the experiment, the stresses are calculated for L-mode discharge parameters on five machines. Analytic expressions for the total parallel Reynolds stresses (contributed from all rational surfaces) are also derived for both modes: they are also exhibited, graphically, using a Gaussian wave intensity model.

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Research Organization:: Univ. of Texas, Austin, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-04ER54742; FG02-04ER-54742

OSTI ID:: 1535286

Alternate ID(s):: OSTI ID: 1330477

Journal Information:: Physics of Plasmas, Vol. 23, Issue 10; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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