Experimental Evidence of Turbulent Transport Regulation by Zonal Flows

被引：42

作者：

Birkenmeier, G. ^{[1
,2
]}

Ramisch, M. ^{[1
]}

Schmid, B. ^{[1
]}

Stroth, U. ^{[1
,2
]}

机构：

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

[2] EURATOM Assoziat, Max Planck Inst Plasmaphys, D-85748 Garching, Germany

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 14期

关键词：

TORSATRON TJ-K; LOW-TEMPERATURE PLASMA; X B SHEAR; REDUCTION;

D O I：

10.1103/PhysRevLett.110.145004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The regulation of turbulent transport by zonal flows is studied experimentally on a flux surface of the stellarator experiment TJ-K. Data of 128 Langmuir probes at different toroidal and poloidal positions on a single flux surface enable us to measure simultaneously the zonal flow activity and the turbulent transport in great detail. A reduction of turbulent transport by 30% during the zonal flow phase is found. It is shown that the reduction process is initiated by a modification in the cross phase between density and electric field followed by a reduction in the fluctuation levels, which sustain low transport levels on larger time scales than the zonal flow lifetime. DOI: 10.1103/PhysRevLett.110.145004

引用

页数：5

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