Response of the far scrape-off layer plasma to strong gas puffing in the high poloidal beta configuration of the QUEST spherical tokamak

被引：3
|
作者：
Onchi, T. [1 ]
Zushi, H. [1 ]
Mishra, K. [2 ,3 ]
Oyama, Y. [2 ]
Nagashima, Y. [1 ]
Hanada, K. [1 ]
Idei, H. [1 ]
Hasegawa, M. [1 ]
Kuzmin, A. [1 ]
Miura, H. [2 ]
Nakamura, K. [1 ]
Fujisawa, A. [1 ]
Nagaoka, K. [4 ]
机构：
[1] Kyushu Univ, RIAM, Kasuga, Fukuoka 8168580, Japan
[2] Kyushu Univ, IGSES, Kasuga, Fukuoka 8168580, Japan
[3] Inst Plasma Res, Gandhinagar 382428, Gujarat, India
[4] Natl Inst Fus Sci, Toki, Gifu 5095292, Japan
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2016年 / 58卷 / 11期
关键词：
spherical tokamak; scrape-off layer; plasma flow; TRANSPORT; FLOWS; FIELD;
D O I：
10.1088/0741-3335/58/11/115004
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 response of the far scrape-off layer (far-SOL) to strong gas puffing (SGP), and its role as the boundary condition for core plasma, are investigated using a two-point Langmuir probe measurement in the high poloidal beta configuration in the QUEST spherical tokamak. The temperature and heat flux behave in an opposite way in the far-SOL and end-plate region after SGP, although SGP increases the density globally. The apparent density decay time in the far-SOL area is much longer than that in the core. Significant co-current flow is driven solely by the electron cyclotron wave in the far-SOL flow. Sheared flow is also observed in the perpendicular velocity profile during the recovered current flat-top phase, and such flow profiles are flattened by SGP. These flow profiles are attributed not only to drift-driven flow but also to transport-driven flow, the sink effect on the end-plate, and the balance of the neutral particle source.
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页数：12
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