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A fringe jump counting method for the phase measurement in the HCN laser interferometer on EAST and its FPGA-based implementation

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Plasma Science and Technology 2024年第4期26卷 156-161页

作者：姚远杨曜提昂宋扬张家敏王琰张耀刘海庆揭银先 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China Anhui Electrical Engineering Professional Technique College Hefei 230022People’s Republic of China Institutes of Physical Science and Information Technology Anhui UniversityHefei 230601People’s Republic of China

Electron density in fusion plasma is usually diagnosed using laser-aided interferometers. The phase difference signal obtained after phase demodulation is wrapped, which is also called a fringe jump. A method has been developed to unwrap the phase difference signal in real time using FPGA, specifically designed to handle fringe jumps in the hydrogen cyanide(HCN) laser interferometer on the EAST superconducting tokamak. This method is designed for a phase demodulator using the fast Fourier transform(FFT) method at the front end. The method is better adapted for hardware implementation compared to complex mathematical analysis algorithms, such as field programmable gate array(FPGA). It has been applied to process the phase measurement results of the HCN laser interferometer on EAST in real time. Electron density results show good confidence in the fringe jump unwrapping method. Further possible application in other laser interferometers, such as the POlarimeter-INTerferometer(POINT)system on EAST tokamak is also discussed.

关键词： electron density laser-aided interferometer fringe jump unwrapping FPGA EAST

Real-time data processing method for CO_(2) dispersion interferometer on EAST

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Plasma Science and Technology 2024年第8期26卷 121-126页

作者：张家敏姚远刘郁阳储宇奇阮天翼张耀刘海庆揭银先凌必利 Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People’s Republic of China University of Science and Technology of China Hefei 230026People’s Republic of China University of California Los Angeles Los AngelesCalifornia 90095United States of America

A real-time data processing system is designed for the carbon dioxide dispersion interferometer(CO_(2)-DI)on *** system utilizes the parallel and pipelining capabilities of an fieldprogrammable gate array(FPGA)to digitize and process the intensity of signals from the ***,the real-time electron density signals are exported through a digital-to-analog converter(DAC)module in the form of analog *** system has been successfully applied in the CO_(2)-DI system to provide low-latency electron density input to the plasma control system on *** results of the latest campaign with long-pulse discharges on EAST(2022–2023)demonstrate that the system can respond effectively in the case of rapid density changes,proving its reliability and accuracy for future electron density calculation.

关键词： dispersion interferometer real-time electron density FPGA EAST

First results of CO_(2) dispersion interferometer on EAST tokamak

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Plasma Science and Technology 2024年第3期26卷 76-82页

作者：刘郁阳李维明姚远张耀张家敏连辉洪博王守信揭银先刘海庆 Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People's Republic of China University of Science and Technology of China Hefei 230026People's Republic of China Institutes of Physical Science and Information Technology Anhui UniversityHefei 230031People's Republic of China

A dispersion interferometer(DI)has been installed and operates on the Experimental Advanced Superconducting Tokamak(EAST).This DI system utilizes a continuous-wave 9.3μm CO_(2)laser source to measure line-averaged electron densities *** contrast to conventional interferometers,the DI does not require substantial vibration isolations or compensating systems to reduce the impact of vibrations in the optical *** also employs a ratio of modulation amplitudes,ensuring it remains immune to the variations in detected *** a variation compensation system,the DI system on EAST reaches a density resolution of less than1.8×10^(-2)πrad and a temporal resolution of 20μ*** measurements made by the POlarimeterINTerferometer(POINT)system and the far-infrared hydrogen cyanide(HCN)interferometer are remarkably consistent with the DI’s *** possibility of fringe jumps and the impact of refraction in high-density discharge can be significantly decreased using a shorter wavelength laser source.A rapid density change of 3×10^(19)m^(-3)during 0.15 s has been measured accurately in shot No.114755 of ***,the DI system demonstrates dependability and stability under 305 s long-pulse discharges in shot No.122054.

关键词： dispersion interferometer(DI) electron density plasma diagnostics Experimental Advanced Superconducting Tokamak(EAST)

Development of a combined interferometer using millimeter wave solid state source and a far infrared laser on ENN's Xuan Long-50(EXL-50)

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Plasma Science and Technology 2022年第6期24卷 23-31页

作者： Jiaxing XIE Xuechao WEI Haiqing LIU Songjian LI Jibo ZHANG Yuan YAO Yunfei WANG yinxian jie Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People’s Republic of China University of Science and Technology of China Hefei 230026People’s Republic of China ENN Science and Technology Development Co. LtdLangfang 065001People’s Republic of China Interdisciplinary Graduate School of Engineering Sciences Kyushu UniversityKasuga 816-8580Japan

A millimeter wave solid state source—far infrared laser combined interferometer system(MFCI)consisting of a three-channel 890 GHz hydrogen cyanide(HCN)laser interferometer and a threechannel 340 GHz solid state source interferometer(SSI)is developed for real-time line-integrated electron density feedback and electron density profile of the EXL-50 spherical tokamak *** interferometer system is a Mach–Zehnder type,with all probe-channels measured vertically,covering the plasma magnetic axis to the outermost closed magnetic *** HCN laser interferometer uses an HCN laser with a frequency of 890 GHz as a light source and modulates a100 k Hz beat signal by a rotating grating,giving a temporal resolution of 10μ*** SSI uses two independent 340 GHz solid-state diode sources as the light source,the frequency of the two sources is adjustable,and the temporal resolution of SSI can reach 1μs by setting the frequency difference of the two lasers at 1 *** main optical path of the two interferometers is compactly installed on a set of double-layer optical platform directly below *** optical path design using corner cube reflectors avoids the large support *** the probebeams of two wavelengths,then the phase error caused by vibration can be *** present,the phase noise of the HCN Interferometer is 0.08 rad,corresponding to a line-integrated electron density of 0.88×10^(17)m^(-2),one channel of measuring result was obtained by the MFCI system,and the highest density measured is about 0.7×10^(19)m^(-2).

关键词： plasma diagnostics—interferometry spectroscopy and imaging nuclear instruments and methods for hot plasma diagnostics

Experimental study of density pump-out on EAST

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Plasma Science and Technology 2017年第1期19卷 36-43页

作者： Shouxin WANG Haiqing LIU yinxian jie Qing ZANG Bo LYU Tao ZHANG Long ZENG Shoubiao ZHANG Nan SHI Ting LAN Zhiyong ZOU Weiming LI Yuan YAO Xuechao WEI Hui LIAN Gen LI Handong XU Xinjun ZHANG Bin WU Youwen SUN EAST Team 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 Tianjin University of Technology Tianjin 300384 People's Republic of China

In the experimental advanced superconducting tokamak,density pump-out phenomena were observed by using a multi-channel polarimeter-interferometer system under different heating schemes of ion cyclotron resonant heating,electron cyclotron resonance heating,and neutral beam *** density pump-out was also induced with application of resonant magnetic perturbation,accompanied with a degradation of particle *** the comparison analysis in all heating schemes,the typical plasma parameters are plasma current 400 k A,toroidal field 2 T,and line average density 2×10^19m^-*** experimental results show that the degree of pump-out is concerned with electron density and heating *** density deuterium low confinement（L-mode） plasmas（〈3.5×10^19m^-3） show strong pump-out *** density pump-out correlated with a significant drop of particle confinement.

关键词： density pump-out particle confinement ECRH ICRF NBI RMP

Spontaneous current relaxation in NBI heated plasmas on EAST

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Plasma Science and Technology 2018年第9期20卷 3-7页

作者： Weixing DING Haiqing LIU Jinping QIAN Shoubiao ZHANG D L BROWER Zhiyong ZOU Weiming LI Yao YANG Long ZENG Jinlin XlE Ping ZHU Changxuan YU Ting LAN Shouxin WANG Hui LIAN yinxian jie Liqun HU and Baonian WAN University of California Los Angeles Los AngelesCalifornia 90095United States of America Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People＇s Republic of China University of Science and Technology of China Hefei 230026People＇s Republic of China

We report on current profile evolution in EAST NBI driven plasmas where two neutral beams are injected,one during the current ramp phase and the second during *** the end of the current ramp phase,it is found that a flat q profile with q0-1 is achieved with low magnetic shear in the *** is observed that plasma current and density both relax much faster than resistive time,even in the absence of sawtooth activity when H-L transition *** fluctuations associated with magnetic perturbations（3/2） as a precursor to the H-L transition are *** is likely that these modes play a role in fast current transport.

关键词： current transport NBI plasma density fluctuations magnetic perturbations EAST

Magnetohydrodynamic effect of internal transport barrier on EAST tokamak

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Plasma Science and Technology 2022年第3期24卷 71-79页

作者： Yuqi CHU Haiqing LIU Shoubiao ZHANG Liqing XU Erzhong LI yinxian jie Hui LIAN Tianfu ZHOU Xi FENG Xuexi ZHANG Yunfei WANG Xiang ZHU Chenbin WU Shouxin WANG Yao YANG K HANADA Bo LYU Yingying LI Qing ZANG EAST Team Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People's Republic of China University of Science and Technology of China Hefei 230026People's Republic of China University of California Los AngelesCalifornia 90095United States of America Interdisciplinary Graduate School of Engineering Sciences Kyushu UniversityKasuga 816-8580Japan Advanced Energy Research Center Shenzhen UniversityShenzhen 518060People's Republic of China Research Institute for Applied Mechanics Kyushu UniversityKasugaFukuoka 816-8580Japan

An internal transport barrier(ITB)can be formed on EAST in exploring high-parameter *** studies show that safety factor(q)profiles,Shafranov shift and magnetohydrodynamic behaviors could be helpful in ITB formation by suppressing anomalous ***,electron density evolution with high resolution demonstrates that fishbone could be dominant in electron density ITB formation and *** power threshold is low in the fishbone condition and the electron density profile is determined by traits of *** shows that the low-k ion mode is suppressed by *** measurement of turbulence in the inner region shows that the internal kink mode could sustain an electron temperature ITB by suppressing the trapped electron *** multi-scale interaction between the kink mode and turbulence by current could be key in sustaining high-electron-temperature long-pulse operation.

关键词： ITB fishbone kink mode micro turbulence

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六盘水市矿山环境现状及可持续发展对策

环保科技 2019年第3期25卷 61-64页

作者：邹银先邹凤钗党杰杨元丽贵州省地质环境监测院

六盘水市矿产资源丰富,因为长期的矿产资源开发导致矿山地质灾害、自然景观损毁、环境污染等诸多问题。本文在实际调查及收集资料的基础上,阐述了矿业开发导致的严重地质环境问题类型,探讨了引发地质环境问题的根源,提出了矿山地质环境... 详细信息

六盘水市矿产资源丰富,因为长期的矿产资源开发导致矿山地质灾害、自然景观损毁、环境污染等诸多问题。本文在实际调查及收集资料的基础上,阐述了矿业开发导致的严重地质环境问题类型,探讨了引发地质环境问题的根源,提出了矿山地质环境治理及经济可持续发展的对策,为当地矿产资源开发与矿山环境保护协调发展提供建议。

关键词：矿山环境问题地质环境治理可持续发展

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某三甲综合医院科研参与情况影响因素研究

中国卫生产业 2022年第1期19卷 1-4页

作者：魏洁刘银贤张力健李龙刘莉王景宁夏医科大学总医院科研处宁夏银川750004

目的了解某三甲综合医院科研参与情况,为进一步提高该医院临床、医技和行政科室人员科研参与水平提供建议。方法在文献复习和对该医院临床、医技和行政管理人员科研参与状况调查的基础上,运用卡方检验和二元Logistic回归对该医院科研参... 详细信息

目的了解某三甲综合医院科研参与情况,为进一步提高该医院临床、医技和行政科室人员科研参与水平提供建议。方法在文献复习和对该医院临床、医技和行政管理人员科研参与状况调查的基础上,运用卡方检验和二元Logistic回归对该医院科研参与情况的影响因素进行分析。结果该三甲综合医院科研参与情况单因素分析结果具有显著性影响的因素有性别、年龄、职称、科室、学历、工作年限和对科研的流程熟悉程度(P<0.05);职称越高、学历越高的人员参与科研的可能性则越大,临床科室人员参与科研的可能性低于行政职能科室人员,熟悉流程人员参与科研的可能性高于不熟悉流程人员。结论该医院科研参与水平在多个方面存在差异,均衡医院科研投入,完善医院科研管理和培训体系,提高全员科研参与积极性和能力,在提高该医院临床、医技和行政人员科研参与方面意义重大。

关键词：科研参与影响因素三甲综合医院