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.

引用

页数：12

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