Investigation of a low frequency coherent mode in Wendelstein 7-X with island divertor

被引：1

作者：

Xiang, H. M. ^{[1
,2
,3
]}

Kraemer-Flecken, A. ^{[3
]}

Han, X. ^{[5
,7
]}

Windisch, T. ^{[4
]}

Weir, G. ^{[4
]}

Rahbarnia, K. ^{[4
]}

Schilling, J. ^{[4
]}

Thomsen, H. ^{[4
]}

Mendes, S. vaz ^{[4
]}

Knieps, A. ^{[3
]}

Vecsei, M. ^{[6
]}

Otte, M. ^{[4
]}

Zoletnik, S. ^{[6
]}

Anda, G. ^{[6
]}

Dunai, D. ^{[6
]}

Zhang, D. ^{[4
]}

Kornejew, P. ^{[4
]}

Huang, J. ^{[5
]}

Zhang, T. ^{[5
]}

Lin, X. D. ^{[1
,2
]}

Gao, X. ^{[1
,2
,5
]}

Liang, Y. ^{[3
,5
]}

机构：

[1] Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen 518060, Peoples R China

[2] Shenzhen Univ, Adv Energy Res Ctr, Shenzhen 518060, Peoples R China

[3] Forschungszentrum Julich, Inst Energie & Klimaforsch Plasmaphys, Partner Trilateral Euregio Cluster TEC, D-52425 Julich, Germany

[4] Max Planck Inst Plasma Phys, D-17491 Greifswald, Germany

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

[6] Ctr Energy Res, H-1525 Budapest, Hungary

[7] Univ Wisconsin, Madison, WI 53705 USA

来源：

NUCLEAR FUSION | 2023年 / 63卷 / 12期

基金：

中国国家自然科学基金;

关键词：

turbulence modulation; velocity oscillation; low frequency mode; STELLARATOR; PHYSICS;

D O I：

10.1088/1741-4326/ad0415

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：

During the island divertor operation of W7-X, especially in standard magnetic configuration (with 5/5 island chain in the scrape-off-layer (SOL)), quasi-periodic electromagnetic oscillation is observed. It appears in the frequency range of 1 kHz-2 kHz, therefore it is called the low frequency mode (LFM) within this paper. It is observed by multiple diagnostics, amongst them, a poloidal correlation reflectometer allowing radial localization of the LFM. The LFM is localized in the SOL and shows an obvious modulation effect on the plasma perpendicular velocity ( V perpendicular to ). Furthermore, broadband turbulence is observed in the fluctuation spectra of the electron density and the magnetic field and the perpendicular correlation length of turbulence eddies are modulated. The calculation of the poloidal flow velocity and its oscillation allows us to study the effect of the LFM on the flow. Cross correlation analysis shows that the perpendicular flow oscillation and the turbulence modulation are closely correlated. The application of external control coils to adjust the island size and position result in a strong modification of the magnetic topology at the plasma edge which affects the appearance, amplitude and frequency of the LFM. Bi-coherence analysis indicates that nonlinear interactions among turbulence components is a possible mechanism for the generation of the LFM.

引用

页数：13

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