Intermittent fluctuations in the TCV scrape-off layer

被引：42
|
作者：
Garcia, O. E. [1 ]
Horacek, J. [2 ]
Pitts, R. A. [3 ]
机构：
[1] UiT Arctic Univ Norway, Dept Phys & Technol, N-9037 Tromso, Norway
[2] Acad Sci Czech Republic, Inst Plasma Phys, Prague, Czech Republic
[3] ITER Org, CS 90 046, F-13067 St Paul Les Durance, France
来源：
NUCLEAR FUSION | 2015年 / 55卷 / 06期
关键词：
scrape-off layer; fluctuations; turbulence; plasma-wall interactions; tcv; intermittency; transport; PLASMA TURBULENCE; SOL; TRANSPORT; TOKAMAK;
D O I：
10.1088/0029-5515/55/6/062002
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：
Probe measurements in the scrape-off layer of tokamak plasmas show that the ion saturation current signal is dominated by large amplitude bursts. Analysis of data time series from tokamak a configuration variable of unprecedented duration reveals that both burst amplitudes and waiting times are exponentially distributed. The average burst wave form has an exponential shape with a characteristic time that is independent of the burst amplitude. These results support a novel stochastic model, which suggests that the high particle density in the far scrape-off layer is due to the radial motion of uncorrelated blob-like structures. Predictions of the model describe the broad range of universality of plasma fluctuations in the boundary region of tokamak plasmas.
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页数：4
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