Measurement of the edge ion temperature in W7-X with island divertor by a retarding field analyzer probe

被引：15

作者：

Li, Y. ^{[1
,2
]}

Henkel, M. ^{[1
]}

Liang, Y. ^{[1
]}

Knieps, A. ^{[1
]}

Drews, P. ^{[1
]}

Killer, C. ^{[3
]}

Nicolai, D. ^{[1
]}

Cosfeld, J. ^{[1
]}

Geiger, J. ^{[3
]}

Feng, Y. ^{[3
]}

Effenberg, F. ^{[4
]}

Zhang, D. ^{[3
]}

Hacker, P. ^{[3
]}

Hoeschen, D. ^{[1
]}

Satheeswaran, G. ^{[1
]}

Liu, S. ^{[2
]}

Grulke, O. ^{[3
]}

Jakubowski, M. ^{[3
]}

Brezinsek, S. ^{[1
]}

Otte, M. ^{[3
]}

Neubauer, O. ^{[1
]}

Schweer, B. ^{[1
]}

Xu, G. S. ^{[2
]}

Cai, J. ^{[2
]}

Huang, Z. ^{[1
]}

机构：

[1] Forschungszentrum Julich, TEC, Inst Energie & Klimaforsch Plasmaphys Partner, D-52425 Julich, Germany

[2] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Anhui, Peoples R China

[3] Max Planck Inst Plasma Phys, Greifswald, Germany

[4] Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 USA

来源：

NUCLEAR FUSION | 2019年 / 59卷 / 12期

基金：

中国国家自然科学基金;

关键词：

ion temperature; retarding field analyzer; W7-X; island configuration; multi-purpose-manipulator; STELLARATOR; OPERATION; EXAMPLE; SYSTEM;

D O I：

10.1088/1741-4326/ab3a79

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：

Knowledge of the edge ion temperature (T-i) is important to understand the edge physics in fusion plasmas. The T-i edge profile has been successfully measured at W7-X in an island divertor configuration using a retarding field analyzer probe on a reciprocating manipulator. The experimental observations show that in the standard configuration, an ion temperature shoulder at the plasma boundary has been observed near the location where a sudden change of the magnetic field connection length appears in the scrape-off layer (SOL) region. The value of the T-i shoulder was observed to be dependent on the edge island structure modified by the control coils, SOL kinetic power, and electron density. A significant reduction and flattening in the edge ion temperature profile has been also observed during the nitrogen seeding from the upper horizontal divertor port. In addition, the edge ion-to-electron temperature ratio tau(i/e) has been calculated, which gradually increases with the major radius and decreases with the normalized ion collisionality. An extended two-point model including upstream ion temperature is introduced to understand the experimental measurement.

引用

页数：11

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