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Two-dimensional vacuum ultraviolet images in different MHD events on the EAST tokamak

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Plasma Science and Technology 2018年第2期20卷 97-103页

作者：王智君高翔明廷凤王嵎民周凡龙飞飞庄清 Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 People's Republic of China University of Science and Technology of China Hefei 230026 People's Republic of China

A high-speed vacuum ultraviolet（VUV） imaging telescope system has been developed to measure the edge plasma emission（including the pedestal region） in the Experimental Advanced Superconducting Tokamak（EAST）.The key optics of the high-speed VUV imaging system consists of three parts：an inverse Schwarzschild-type telescope,a micro-channel plate（MCP）and a visible imaging high-speed *** VUV imaging system has been operated routinely in the 2016 EAST experiment *** dynamics of the two-dimensional（2 D） images of magnetohydrodynamic（MHD） instabilities,such as edge localized modes（ELMs）,tearing-like modes and disruptions,have been observed using this *** related VUV images are presented in this paper,and it indicates the VUV imaging system is a potential tool which can be applied successfully in various plasma conditions.

关键词： VUV MHD EAST

Measurement of Magnetic Island Width by Multi-Channel ECE Radiometer on HT-7 Tokamak

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Plasma Science and Technology 2013年第3期15卷 217-220页

作者：韩翔凌必利高翔刘永提昂李二众徐立清王嵎民 Institute of Plasma Physics Chinese Academy of Sciences

A 16-channel electron cyclotron emission （ECE） radiometer has been employed to observe the （m, n） = （2, 1） magnetic island structure on HT-7 tokamak, where m and n represent the poloidal and toroidal mode number respectively. The results indicate that the island width is about 7 cm when the magnetic island is saturated during the m/n = 2/1 mode. The location of resonance surface can be determined by plotting the contour of ECE relative fluctuation. This method could be applied to the HT-7 and EAST campaigns in the future for the research of neoclassical tearing modes （NTMs）.

关键词： magnetic island width ECE fluctuation HT-7 tokamak

Present Status of the Electron Cyclotron Emission Measurements on HT-7 and EAST

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Plasma Science and Technology 2011年第3期13卷 352-356页

作者：刘永提昂韩翔王嵎民李二众凌必利胡立群高翔 Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China

Present status of the diagnostics for electron cyclotron emission measurements on both HT-7 and EAST is reported. A 16-channel heterodyne radiometer system and a 20-channel grating polychromator, have been installed on HT-7 and EAST. A 32-channel heterodyne radiometer system, with a wider frequency coverage and better spatial resolution, is being built. In order to provide a reliable electron temperature profile, an in-situ absolute calibration system is currently being built. With the ECE measurements, study on the electron heat transport and the anomalous Doppler resonance is conducted.

关键词： electron cyclotron emission electron temperature profile heterodyne radiome-ter grating polychromator

Experimental Determination of the ICRF Power Depositing on the Electrons in HT-7

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Plasma Science and Technology 2013年第11期15卷 1100-1102页

作者：布景亮刘永张新军提昂张寿彪张涛韩翔王嵎民凌必利高翔 Institute of Plasma Physics Chinese Academy of Sciences

This paper reports for the first time an experimental study on the power deposition profile of the ion cyclotron range frequencies （ICRF） power depositing on electrons in HT-7. The fast Fourier transform （FFT） analysis and the break in slope （BIS） method are utilized to obtain the information of the power deposition. The results indicate that the electrons were heated directly, and the electrons absorbed around 20% of the input power of the discharge of interest.

关键词： ICRF power modulation BIS

Observation of Pedestal Plasma Turbulence on EAST Tokamak

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Plasma Science and Technology 2013年第8期15卷 732-737页

作者：高翔张涛韩翔张寿彪王嵎民刘子奚杨曜刘少承史楠凌必利李建刚 the EAST team Institute of Plasma Physics Chinese Academy of Sciences

Pedestal plasma turbulence was experimentally studied by microwave reflectometry on EAST tokamak. The characteristics of edge pedestal turbulence during dithering L-H transition, ELM-free H-mode phase and inter-ELM phase have recently been studied on EAST. An edge spatial structure of density fluctuation and its dithering temporal evolution is observed for the first time on the EAST tokamak during the L-H transition phase. A coherent mode usually appears during the ELM-free phase prior to the first ELM on EAST tokamak. The mode frequency gradually decreases as the pedestal evolves. Analysis shows that the coherent mode is in the pedestal region inside the separatrix. In plasma with type-III ELMs, a precursor mode before ELM is usually observed. The frequency of the precursor was initially about 150 kHz and gradually decreased till the next ELM. The mode amplitude increases or shows saturation before ELM. In the plasma with compound ELMs composed of high and low frequency ELMs, the precursor was also observed before the high frequency ELM while the harmonic oscillations with frequencies of 20 kHz, 40 kHz and 60 kHz appear before the low frequency ELM.

关键词： H-mode pedestal turbulence reflectometry

Density Profile and Fluctuation Measurements by Microwave Reflectometry on EAST

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Plasma Science and Technology 2014年第4期16卷 311-315页

作者：张寿彪高翔凌必利王嵎民张涛韩翔刘子奚布景亮李建刚 EAST team Institute of Plasma Physics Chinese Academy of Sciences

A microwave reflectometry system operating in the V-band frequency with extraor- dinary mode polarization has been developed on the EAST tokamak. The reflectometry system, using a voltage-controlled oscillator （VCO） source driven by an arbitrary waveform generator with high temporal resolution, can operate for the density profile measurement. The result of the bench test shows that the output frequency of the VCO has a linear dependence on time. The dispersion of reflectometry system is determined and reported in this paper. The evolution of a pedestal density profile during the L-H transition is observed by the reflectometry in H-mode discharges on EAST tokamak. A frequency synthesizer is used to replace the VCO as microwave source for density fluctuation measurements. The level of density fluctuation in the pedestal shows an abrupt decrease when the plasma enters into H-mode. A coherent mode with a frequency of about 100 kHz is observed and the mode frequency decreases gradually as the pedestal evolves.

关键词： microwave reflectometry pedestal density fluctuation EAST

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EAST等离子体非局域热输运实验研究

EAST等离子体非局域热输运实验研究

Q-Band X-Mode Reflectometry and Density Profile Reconstruction

第十六届全国等离子体科学技术会议暨第一届全国等离子体医学研讨会

作者：韩翔高翔凌必利刘永提昂张寿彪张涛王嵎民刘子奚等离子体物理研究所中国科学院

引言等离子体电子热输运的理论及实验研究一直是磁约束核聚变领域重点讨论的课题之一。等离子体反常输运的理论模型提出,局域微观不稳定性会引起湍流,从而触发等离子体局域的湍流输运。这一理论己在很多磁约束装置的实验中得以验证。然...

引言等离子体电子热输运的理论及实验研究一直是磁约束核聚变领域重点讨论的课题之一。等离子体反常输运的理论模型提出,局域微观不稳定性会引起湍流,从而触发等离子体局域的湍流输运。这一理论己在很多磁约束装置的实验中得以验证。然而最近十几年实验中发现,在一定实验参数下,利用等离子加料或波加热等手段,等离子体边界的密度扰动会触发芯部电子温度迅速上升,这一反常的芯部响应利用已有的

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Plasma Science and Technology 2015年第12期17卷 985-990页

作者：屈浩张涛张寿彪文斐王嵎民孔德峰韩翔杨曜高宇黄灿斌蔡剑青高翔 the EAST team Institute of Plasma Physics Chinese Academy of Sciences

By installing an X-mode polarized Q-band（32-56 GHz） reflectometry at the low field side on EAST,the zero density cutoff layer was determined and the edge density profile was measured in normally operating plasmas.A Monte Carlo procedure has been developed to analyze the density profiles by considering the error of time delay measured by *** combining this Q-band and previously developed V- and W-band reflectometries,the density profiles from edge to core can be measured in most EAST *** line integrated densities deduced from density profiles measured by reflectometry are consistent with those directly measured by a horizontal *** density pedestal measured by reflectometry shows a clear crash during an ELM（edge localized mode） event,after which the pedestal gradually increases and recovers in 10 ms and then remains little changed up to the next ELM.

关键词： Reconstruction interferometer fitting normally EAST deduced considering normalized cutoff localized

VUV信号强度与等离子体宏观参数相关性分析

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强激光与粒子束 2018年第4期30卷 141-145页

作者：龙飞飞明廷凤周凡李凯王智君庄清吴承瑞王嵎民黄娟臧庆张涛刘海庆高翔中国科学院等离子体物理研究所合肥230026 中国科学技术大学合肥230026

东方超环(EAST)上高速真空紫外(VUV)成像系统是一套选择性测量中心波长为13.5nm的等离子体线辐射的光学成像系统。此系统具有高时空分辨能力,主要用于边界(包括台基区)等离子体行为研究。该系统已经投入EAST等离子体物理实验并获得了大... 详细信息

东方超环(EAST)上高速真空紫外(VUV)成像系统是一套选择性测量中心波长为13.5nm的等离子体线辐射的光学成像系统。此系统具有高时空分辨能力,主要用于边界(包括台基区)等离子体行为研究。该系统已经投入EAST等离子体物理实验并获得了大量的实验数据。基于这些数据,分析了VUV诊断系统的信号强度与等离子体宏观参数之间的相关性,着重研究了EAST上中性束注入(NBI)加热功率、杂质(碳和锂)水平、电子密度等因素对VUV信号强度的影响。结果与预期基本一致:随着NBI功率的增加,VUV信号强度随之增强;VUV信号强度与电子密度、杂质水平呈现线性关系。此外,本文还评估了由于NBI注入引起的电荷交换复合产生的C5+离子对VUV信号的贡献,结果表明这部分贡献可以忽略不计。

关键词： VUV成像中性束等离子体杂质水平