Experimental study of core and edge fluctuations by reflectometry on EAST tokamak

Zhen ZHOU (周振); Tao ZHANG (张涛); Mingfu WU (吴茗甫); Kaixuan YE (叶凯萱); Fubin ZHONG (钟富彬); Jia HUANG (黄佳); Kangning GENG (耿康宁); Yukai LIU (刘煜凯); Gongshun LI (李恭顺); Haoming XIANG (向皓明); Yumin WANG (王嵎民); Fei WEN (文斐); Sanqiu LIU (刘三秋)

doi:10.1088/2058-6272/abf4b5

Plasma Science and Technology > 2021 > 23(7): 75101-075101. > DOI: 10.1088/2058-6272/abf4b5

Zhen ZHOU (周振), Tao ZHANG (张涛), Mingfu WU (吴茗甫), Kaixuan YE (叶凯萱), Fubin ZHONG (钟富彬), Jia HUANG (黄佳), Kangning GENG (耿康宁), Yukai LIU (刘煜凯), Gongshun LI (李恭顺), Haoming XIANG (向皓明), Yumin WANG (王嵎民), Fei WEN (文斐), Sanqiu LIU (刘三秋). Experimental study of core and edge fluctuations by reflectometry on EAST tokamak[J]. Plasma Science and Technology, 2021, 23(7): 75101-075101. DOI: 10.1088/2058-6272/abf4b5

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Experimental study of core and edge fluctuations by reflectometry on EAST tokamak

¹ Jiangxi Province Key Laboratory of Fusion and Information Control, Institute of Fusion Energy and Plasma Application, Department of Physics, Nanchang University, Nanchang 330031, People's Republic of China
² Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
³ University of Science and Technology of China, Hefei 230026, People's Republic of China
⁴ Advanced Energy Research Center, Shenzhen University, Shenzhen 518060, People's Republic of China
⁵ Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 5180602, People's Republic of China

Funds: The authors are grateful to Dr C. Zhou who helped to analyze the DBS data. This work has been supported by the National Key R&D Program of China (No. 2017YFE0301205), and National Natural Science Foundation of China (Nos. 11875289, 11675211, 11805136, and 12075284).

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Received Date: November 12, 2020
Revised Date: March 31, 2021
Accepted Date: April 01, 2021

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Abstract

Abstract

An eight-channel poloidal correlation reflectometer (PCR) with O-mode polarization has been installed in the EAST tokamak to measure the fluctuations from core to edge. The PCR launches eight different frequency microwaves (20.4, 24.8, 33, 40, 42.4, 48, 52.6, 57.2 GHz) into the plasma from the low field side and two poloidally separated antennae are used to receive the reflected waves. As a result, the diagnostic can measure fluctuations in eight (radial)× two (poloidal) spatial positions. The diagnostic has been applied to study the core and edge pedestal fluctuations during an inter-ELM phase in H-mode plasma. This inter-ELM phase can be divided into two stages. In the first stage, a low frequency (<50 kHz) broadband fluctuation dominates in the pedestal gradient region. In the second stage, this fluctuation is strongly suppressed and quasi-coherent fluctuations (QCFs) appear. The QCF's amplitude increases with the pedestal density gradient, implying density gradient driven instabilities. But the core fluctuations inside the pedestal show no evident changes during the inter-ELM phase.
- core fluctuation,
- edge fluctuation,
- reflectometry

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References

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Experimental study of core and edge fluctuations by reflectometry on EAST tokamak