Observation of coherent sheared turbulence flows in the DIII-D tokamak

被引：118

作者：

Jakubowski, M ^{[1
]}

Fonck, RJ ^{[1
]}

McKee, GR ^{[1
]}

机构：

[1] Univ Wisconsin, Madison, WI 53706 USA

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 26期

关键词：

D O I：

10.1103/PhysRevLett.89.265003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Time-resolved measurements of the turbulent density flow field in a tokamak plasma reveal low-frequency (similar to15 KHz), coherent oscillations in the poloidal flow, (ν) over tilde (theta). These flow oscillations have a long poloidal wavelength (m<3) and narrow radial extent (k(r)rho(i)similar to0.2). The estimated flow-shearing rate is of the same order of magnitude as the turbulence decorrelation rate and may thus regulate the turbulence amplitude. These features are consistent with theoretically predicted axisymmetric, self-regulating, sheared flows recognized as geodesic acoustic modes.

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