Investigation of Turbulent Transport and Shear Flows in the Edge of Toroidal Plasmas

被引：6

作者：

Ramisch, M. ^{[1
]}

Birkenmeier, G. ^{[1
]}

Happel, T. ^{[2
]}

Koehn, A. ^{[1
]}

Mandizadeh, N. ^{[3
]}

Manz, P. ^{[1
]}

Nold, B. ^{[1
]}

Wilcox, R. ^{[4
]}

Anderson, D. T. ^{[4
]}

Stroth, U. ^{[1
]}

机构：

[1] Univ Stuttgart, Inst Plasmaforsch, D-70569 Stuttgart, Germany

[2] Asociac EURATOM CIEMAT, Lab Nacl Fus, Madrid 28040, Spain

[3] ABB Switzerland Ltd, Corp Res, CH-5405 Baden, Switzerland

[4] Univ Wisconsin, HSX Plasma Lab, Madison, WI 53706 USA

来源：

CONTRIBUTIONS TO PLASMA PHYSICS | 2010年 / 50卷 / 08期

关键词：

Blobs; turbulent transport; zonal flow; Reynolds stress; TORSATRON TJ-K; INTERMITTENCY; BOUNDARY;

D O I：

10.1002/ctpp.200900033

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：

Intense Langmuir-probe measurements were carried out in the toroidal low-temperature plasma of the torsatron TJ-K in order to investigate the origin and dynamics of intermittent transport events, so-called blobs, at the transition from closed to open field lines. The statistical properties of the fluctuations at the plasma boundary agree with observations made in fusion edge plasmas. Blobs were found to be generated locally through a change in turbulence drive across the separatrix. The non-linear spectral energy transfer from small-scale fluctuations into large-scale flows was measured with a 128-probe array. The results point to the transfer being a key loss channel for turbulence energy leading to a reduction in turbulent transport. Earlier observations [M.A. Pedrosa et al., Phys. Rev. Lett. 100, 215003 (2008)] of enhanced long-range correlations in the plasma potential through externally induced shear flows in TJ-II stellarator were verified. The newly measured correlation of zonal vorticity and Reynolds stress at induced flow shear indicates an enhancement of zonal-flow drive. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

引用

页码：718 / 723

页数：6

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