A new mechanism for filament disconnection at the X-point: poloidal shear in radial E x B velocity

被引：9
|
作者：
Nespoli, F. [1 ,4 ]
Tamain, P. [2 ]
Fedorczak, N. [2 ]
Galassi, D. [3 ]
Marandet, Y. [4 ]
机构：
[1] Princeton Plasma Phys Lab, 100 Stellarator Rd, Princeton, NJ 08540 USA
[2] CEA Cadarache, IRFM, F-13108 St Paul Les Durance, France
[3] Ecole Polytech Fed Lausanne, SPC, CH-1015 Lausanne, Switzerland
[4] Aix Marseille Univ, CNRS, PIIM UMR 7345, Marseille, France
来源：
NUCLEAR FUSION | 2020年 / 60卷 / 04期
关键词：
turbulence; sheared flow; plasma filaments; EDGE; TURBULENCE; TRANSPORT; PLASMAS; SOL;
D O I：
10.1088/1741-4326/ab6f1e
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：
Plasma filaments generated by turbulence in the scrape-off layer are sometimes observed in experiments and simulations to disconnect from the target plate in the vicinity of the X-point, resulting in a 'quiescent zone' with reduced fluctuations, possibly affecting the fluctuating part of the divertor heat loads. This phenomena is usually explained by the flux tubes squeezing, induced by flux expansion, down to scales where collisions dominate. In this work, we consider an additional mechanism spontaneously arising at the X-point: the poloidal shear in radial E x B velocity. Through a simple model, tested against 3D global turbulence simulations, we quantify the effectiveness of this disconnection mechanism and identify ways to control it.
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收藏
页数：8
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