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Experimental study of core and edge fluctuations by reflectometry on EAST tokamak
Plasma Science and Technology ( IF 1.7 ) Pub Date : 2021-05-12 , DOI: 10.1088/2058-6272/abf4b5
Zhen ZHOU 1, 2 , Tao ZHANG 2 , Mingfu WU 2, 3 , Kaixuan YE 2, 3 , Fubin ZHONG 2, 3 , Jia HUANG 2, 3 , Kangning GENG 4, 5 , Yukai LIU 4, 5 , Gongshun LI 2 , Haoming XIANG 2, 3 , Yumin WANG 2 , Fei WEN 2 , Sanqiu LIU 1
Affiliation  

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.



中文翻译:

EAST托卡马克反射计核心和边缘波动的实验研究

EAST 托卡马克中安装了一个八通道极向相关反射计 (PCR),带有 O 模式偏振,用于测量从核心到边缘的波动。PCR 将八种不同频率的微波(20.4、24.8、33、40、42.4、48、52.6、57.2 GHz)从低场侧发射到等离子体中,两个极向分离的天线用于接收反射波。因此,诊断可以测量八个(径向)两个(极向)空间位置的波动。该诊断已应用于研究 H 模式等离子体中 ELM 间阶段期间的核心和边缘基座波动。这个跨 ELM 阶段可以分为两个阶段。在第一阶段,低频(<50 kHz)宽带波动在基座梯度区域占主导地位。在第二阶段,这种波动受到强烈抑制,出现准相干波动(QCF)。QCF 的振幅随着基座密度梯度的增加而增加,这意味着密度梯度驱动的不稳定性。但在跨 ELM 阶段,基座内部的核心波动没有表现出明显的变化。

更新日期:2021-05-12
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