Observation of the L-H Confinement Bifurcation Triggered by a Turbulence-Driven Shear Flow in a Tokamak Plasma

被引：111

作者：

Yan, Z. ^{[1
]}

McKee, G. R. ^{[1
]}

Fonck, R. ^{[1
]}

Gohil, P. ^{[2
]}

Groebner, R. J. ^{[2
]}

Osborne, T. H. ^{[2
]}

机构：

[1] Univ Wisconsin, Madison, WI 53706 USA

[2] Gen Atom Co, San Diego, CA 92186 USA

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 12期

关键词：

VELOCIMETRY;

D O I：

10.1103/PhysRevLett.112.125002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Comprehensive 2D turbulence and eddy flow velocity measurements on DIII-D demonstrate a rapidly increasing turbulence-driven shear flow that develops similar to 100 mu s prior to the low-confinement (L mode) to high-confinement (H mode) transition and appears to trigger it. These changes are localized to a narrow layer 1-2 cm inside the magnetic boundary. Increasing heating power increases the Reynolds stress, the energy transfer from turbulence to the poloidal flow, and the edge flow shearing rate that then exceeds the decorrelation rate, suppressing turbulence and triggering the transition.

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页数：5

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