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Visible imaging of edge fluctuations in the TFTR tokamak

 

作者: S. J. Zweben,   S. S. Medley,  

 

期刊: Physics of Fluids B: Plasma Physics  (AIP Available online 1989)
卷期: Volume 1, issue 10  

页码: 2058-2065

 

ISSN:0899-8221

 

年代: 1989

 

DOI:10.1063/1.859070

 

出版商: AIP

 

数据来源: AIP

 

摘要:

Images of the visible light emission from the inner wall region of the TFTR tokamak [M. G. Belletal., inPlasmaPhysicsandControlledNuclearFusionResearch1988, Proceedings of the 12th International Conference, Nice, France (IAEA, Vienna, in press)] have been made using a rapidly gated, intensified TV camera. Strong ‘‘filamentation’’ of the neutral deuterium D&agr;light is observed when the camera gating time is <100 &mgr;sec during neutral‐beam‐heated discharges. These turbulent filaments vary in position randomly versus time and have a poloidal wavelength of ≊3–5 cm, which is much shorter than their parallel wavelength of ≊100 cm. A second and new type of edge fluctuation phenomenon, which is called a ‘‘merfe,’’ is also described. Merfes are a regular poloidal pattern of toroidally symmetric, small‐scale marfes that move away from the inner midplane during the current decay after neutral beam injection. Some tentative interpretations of these two phenomena are presented.

 

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