Influence of Bt on the magnetic turbulence and on the runaway transport in low-density discharges

被引：9

作者：

Kudyakov, T. ^{[1
]}

Abdullaev, S. S. ^{[2
]}

Bozhenkov, S. A. ^{[3
]}

Finken, K. H. ^{[1
,2
]}

Jakubowski, M. W. ^{[3
]}

Lehnen, M. ^{[2
]}

Sewell, G. ^{[4
]}

Willi, O. ^{[1
]}

Xu, Y. ^{[5
]}

机构：

[1] Univ Dusseldorf, Inst Laser & Plasmaphys, D-40225 Dusseldorf, Germany

[2] Forschungszentrum Julich GmbH, Inst Energy & Climate Res IEK Plasma Phys 4, D-52425 Julich, Germany

[3] Max Planck Inst Plasma Phys, IPP EURATOM Assoc, D-17491 Greifswald, Germany

[4] Univ Texas El Paso, Dept Math, El Paso, TX 79968 USA

[5] EURATOM, Lab Phys Plasmas, ERM KMS, Lab Plasmafys, B-1000 Brussels, Belgium

来源：

NUCLEAR FUSION | 2012年 / 52卷 / 02期

关键词：

ELECTRONS; DIFFUSION; TOKAMAK; DISRUPTIONS; GENERATION; TEXTOR-94; GAS;

D O I：

10.1088/0029-5515/52/2/023025

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 analysis of small-scale magnetic fluctuations has been performed in the TEXTOR tokamak. Runaway electrons are used as test particles for studying the turbulent transport at different toroidal magnetic fields. The flux of runaways from the plasma increases with decreasing magnetic field strength. The comparison with a model of magnetic braiding provides insight into the basic properties of the turbulence. A substantial growth of the diffusion coefficients of runaways at the plasma edge with an increase in the width of the turbulent spectrum is demonstrated. The diffusion coefficients of runaways and their flux at the plasma edge are derived from measurements by an IR camera and runaway probe. The level of the magnetic fluctuations and the poloidal spectrum of the magnetic turbulence vary between 10(-5) and 5 x 10(-5) T and decrease with the magnetic field strength. In addition, the width of the spectrum can be derived to a poloidal mode spectrum of w(n) >= 20.

引用

页数：11

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