Experimental study of quasi-coherent mode using EAST tangential CO2 laser collective scattering diagnostic in far-forward mode

被引：21

作者：

Sun, P. J. ^{[1
]}

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

Ren, Y. ^{[2
]}

Zhang, X. D. ^{[1
]}

Wu, G. J. ^{[1
]}

Wang, Y. M. ^{[1
]}

Shi, T. H. ^{[1
]}

Lyu, B. ^{[1
]}

Duan, Y. M. ^{[1
]}

Zhang, J. Z. ^{[1
]}

Wang, F. D. ^{[1
]}

Liu, H. Q. ^{[1
]}

Mao, S. T. ^{[1
]}

Xu, L. Q. ^{[1
]}

Li, Q. ^{[3
]}

Li, P. ^{[1
]}

Bi, J. ^{[1
]}

Hu, L. Q. ^{[1
]}

Li, J. G. ^{[1
]}

机构：

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

[2] Princeton Plasma Phys Lab, POB 451, Princeton, NJ 08543 USA

[3] Guangdong Univ Technol, Guangzhou 510006, Guangdong, Peoples R China

来源：

PHYSICS OF PLASMAS | 2019年 / 26卷 / 01期

基金：

中国国家自然科学基金;

关键词：

TRANSPORT; PLASMAS; EDGE;

D O I：

10.1063/1.5049209

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：

A quasi-coherent mode (QCM) was measured by the tangential CO2 laser collective scattering diagnostic at high plasma electron density during both enhanced D-alpha/small edge-localized mode (ELM) and ELM-free H mode phases in Experimental Advanced Superconducting Tokamak (EAST). Experimental results from only local oscillator CO2 laser scattering prove that the QCM is measured by the scattering diagnostic in the far-forward mode. The driven QCM density fluctuation (k(perpendicular to) < 3 cm(-1)) and magnetic fluctuation suggest that the QCM is an electromagnetic mode. The typical frequency of the QCM is f approximate to 26.5 kHz. A combination analysis of scattering signals and Mirnov signals suggests that the QCM has toroidal mode number n approximate to 17 and rotates along with the electron diamagnetic drift velocity direction in the lab frame. The analysis of Mirnov and reflectometer signals supports that the QCM locates in the edge pedestal region. The QCM power has been found to be related to both the D-alpha signal and the pedestal density gradient. A comparison of the EAST QCM and C-Mod quasi-coherent mode has been given in detail. Published under license by AIP Publishing.

引用

页数：9

共 4 条

[1] A tangential CO2 laser collective scattering system for measuring short-scale turbulent fluctuations in the EAST superconducting tokamak
Cao, G. M.
Li, Y. D.
Li, Q.
Zhang, X. D.
Sun, P. J.
Wu, G. J.
Hu, L. Q.
FUSION ENGINEERING AND DESIGN, 2014, 89 (12) : 3016 - 3021
[2] Study of turbulence modulation and core density peaking with CO2 laser collective scattering diagnostics in the EAST tokamak
Li, P.
Li, Y. D.
Li, J. G.
Wu, G. J.
Lan, T.
Zhang, B.
Geng, J. S.
Zhang, Y. K.
Xu, L. Q.
Wang, H. L.
Liu, H. Q.
NUCLEAR FUSION, 2020, 60 (06)
[3] Study on CO2 Measurement Using Tunable Multi-Mode Diode Laser Absorption Spectroscopy
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Chen Bao-xue
Hu Bo
Long Xiu-hui
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SPECTROSCOPY AND SPECTRAL ANALYSIS, 2013, 33 (12) : 3269 - 3272
[4] The phenomenon of skin contraction in CO2 LASER surgical incisions using superpulse and continuous emission mode - preliminary study
Nunes, A.
Azevedo, P.
Carreira, L. Miguel
LASERS IN MEDICAL SCIENCE, 2024, 39 (01)

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