Flux of Parallel Flow Momentum by Parallel Shear Flow Driven Instability

被引：26

作者：

Kosuga, Yusuke ^{[1
,2
]}

Itoh, Sanae-I. ^{[2
,3
]}

Itoh, Kimitaka ^{[3
,4
]}

机构：

[1] Kyushu Univ, Inst Adv Study, Fukuoka 8128581, Japan

[2] Kyushu Univ, Appl Mech Res Inst, Fukuoka 8168580, Japan

[3] Kyushu Univ, Res Ctr Plasma Turbulence, Fukuoka 8168580, Japan

[4] Natl Inst Fus Sci, Toki, Gifu 5095202, Japan

来源：

PLASMA AND FUSION RESEARCH | 2016年 / 11卷

关键词：

parallel shear flow instability; dispersion relation; flux of parallel momentum;

D O I：

10.1585/pfr.11.1203018

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The flux of parallel momentum by parallel shear flow driven instability is calculated with the self-consistent mode dispersion. The result indicates that the diffusive component has two characteristic terms: v(D1) similar to (v) over tilde (2)(x)/gamma((0)) and v(D2) similar to (v) over tilde (2)(x)/ (k(parallel to)(2)D(parallel to)) where (v) over tilde (x) is the fluctuation radial velocity, gamma((0)) is the growth rate of the mode, k(parallel to) is the parallel wave number, and D-parallel to is the electron diffusivity along the magnetic field. v(D1) results when the parallel flow shear is above the threshold, while. v(D2) is important around the marginal state. Since typically. v(D1) >> v(D2) similar to D-n, where D-n is the particle diffusivity, the Prandtl number (equivalent to v/D-n) becomes large when parallel flow shear driven instability occurs. This feature may explain the experimental observation on the difference between profiles of density and toroidal flow in edge and SOL plasmas. (C) 2016 The Japan Society of Plasma Science and Nuclear Fusion Research.

引用

页数：3