检索结果-南通市图书馆

Plasma Science and Technology 2024年第8期26卷 32-36页

作者：董力立王明远刘文军石跃江董家齐郭栋孙恬恬顾翔宋显明袁保山彭元凯 the ENN Team Hebei Key Laboratory of Compact Fusion Langfang 065001People’s Republic of China School of Mathematics and Physics Anqing Normal UniversityAnqing 246133People’s Republic of China ENN Science and Technology Development Co.Ltd. Langfang 065001People’s Republic of China

A three-fluid equilibrium plasma with bulk plasma and energetic electrons has been observed on the Xuanlong-50(EXL-50) spherical torus, where the energetic electrons play a crucial role in sustaining the plasma current and pressure. In this study, the equilibrium of a multi-fluid plasma was investigated by analyzing the relationship between the external vertical magnetic field(B_(V)),plasma current(I_(p)), the poloidal ratio(β_(p)) and the Shafranov formula. Remarkably, our research demonstrates some validity of the Shafranov formula in the presence of multi-fluid plasma in EXL-50 spherical torus. This finding holds significant importance for future reactors as it allows for differentiation between alpha particles and background plasma. The study of multi-fluid plasma provides a significant reference value for the equilibrium reconstruction of burning plasma involving alpha particles.

关键词： plasma equilibrium Shafranov formula multi-fluid plasma

Spectroscopic Measurements of Impurity Spectra on the EAST Tokamak

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2012年第12期14卷 1048-1053页

作者： FU Jia LI Yingying shi yuejiang WANG Fudi ZHANG Wei LV Bo HUANG Juan WAN Baonian ZHOU Qian Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 China University of Science and Technology of China Hefei 230039 China WCI Center for Fusion Theory National Fusion Research Institute 52 Eoeun-Dong Yusung-Gu Daejeon 305-333 South Korea School of Natural Sciences Anhui Agricultural University Hefei 230036 China

Ultraviolet （UV） and visible impurity spectra （200-750 nm） are commonly used to study plasma and wall interactions in magnetic fusion plasmas. Two optical multi-channel analysis （OMA） systems have been installed for the UV-visible spectrum measurement on EAST. These two OMA systems are both equipped with the Czerny-Turner （C-T） type spectrometer. The upper vacuum vessel and inner divertor baffle can be viewed simultaneously through two optical lenses. The OMA1 system is mainly used for multi-impurity lines radiation measurement. A 280 nm wavelength range can be covered by a 300 mm focal length spectrometer equipped with a 300 grooves/mm grating. The Da/Ha line shapes can be resolved by the OMA2 system. The focal length is 750 mm. The spectral resolution can be up to 0.01 nm using a 1800 grooves/mm grating. The impurity behaviour and hydrogen ratio evolution after boroniztion, lithium coating, and siliconization are compared. Lithium coating has shown beneficial effects on the reduction of edge recycling and low Z impurity （C, O） influx. The impurity expelling effect of the divertor configuration is also briefly discussed through multi-channels observation of OMA1 system.

关键词： OMA optical multi channel analysis boronization lithium coating wall condition tokamak

Development of signal analysis method for the motional Stark effect diagnostic on EAST

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2017年第10期19卷 1-4页

作者： Jia FU Bo LYU Haiqing LIU Yingying LI Dongmei LIU Yongqing WEI Chao FAN yuejiang shi Zhenwei WU Baonian WAN Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 People＇s Republic of China HeFei University of Technology Hefei 230009 People＇s Republic of China Department of Nuclear Engineering Seoul National University Seoul 08826 Republic of Korea

A pilot single-channel Motional Stark Effect（MSE） diagnostic has been developed on EAST since 2015. The dual photo-elastic modulators（PEM） were employed to encode the polarization angle into a time-varying signal. The pitch angle was related to the ratio of modulation amplitude at the second harmonic frequency. A digital harmonic analyzer（DHA） technique was developed for extracting the second harmonic amplitude. The results were validated with a hardware phase lock-in amplifier, and is also consistent with the software dual phase-locking algorithm.

关键词： motional Stark effect fast Fourier transform

Effect of resonant magnetic perturbation on boundary plasma turbulence and transport on J-TEXT tokamak

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2019年第12期21卷 13-19页

作者： Ting WU Lin NIE Min XU Jie YANG Zhipeng CHEN yuejiang shi Nengchao WANG Da LI Rui KE Yi YU Shaobo GONG Ting LONG Yihang CHEN Bing LIU J-TEXT Team Southwestern Institute of Physics Chengdu 610041People's Republic of China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Department of Nuclear Engineering Seoul National UniversitySeoul 08826Republic of Korea School of Physics University of Science and Technology of ChinaHefei 230026People's Republic of China Institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People's Republic of China

The effect of resonant magnetic perturbation(RMP) on boundary turbulence and transport in J-TEXT plasma is experimentally *** plasma fluctuations in discharges with and without the(m/n=3/1) RMP currents are diagnosed by using Langmuir probe *** was found that fluctuations in the edge and scrape-off layer(SOL) regions decrease with the application of a 6 kA *** broadband turbulence at the radial location of ρ~0.9 which has a characteristic frequency of 40-150 kHz was strongly suppressed when applying RMP,as was the radial turbulent particle flux and blob transport in the near-SOL *** experimental findings make RMP a promising method of suppressing and controlling turbulence and particle transport in a plasma boundary.

关键词： RMP turbulent transport blob

Toroidal component of velocity for geodesic acoustic modes in the edge plasmas of the J-TEXT tokamak

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2021年第10期23卷 112-119页

作者： Yaoyu Xie Kaijun Zhao Zhipeng Chen Jiaqi Dong Kimitaka Itoh Zhongyong Chen yuejiang shi Yonghua Ding Jun Cheng Longwen Yan Hai Liu Zhifeng Cheng Zhoujun Yang Nengchao Wang Lu Wang Jianqiang Xu Yunfeng Liang J-TEXT Team School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013People’s Republic of China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People's Republic of China Southwestern Institute of Physics Chengdu 610041People's Republic of China Institute of Science and Technology Research Chubu UniversityKasuga 816-8580Japan Research Center for Plasma Turbulence Kyushu UniversityKyushu UniversityChubu UniversityAichi 487-8501Japan National Institute for Fusion Science Toki 509-5292Japan ENN Science and Technology Development Co. Ltdand Hebei Key Laboratory of Compact FusionLangfang 065001People's Republic of China Institute of Fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People's Republic of China

The toroidal component of the velocity for geodesic acoustic modes(GAMs)is first *** Langmuir probe arrays set up near the top tokamak of the J-TEXT were utilized for this study.A significant peak at the GAM frequency is observed in Mach number *** toroidal velocity for the GAMs is estimated as 10–100 ms-1 and increases with the poloidal *** ratio of toroidal component to the poloidal one of the velocity is mainly located in the interval between 0.3 and *** higher safety factors q,the ratio almost does not change with decreasing the safety factor,whereas it goes up sharply at low *** coherencies between poloidal electric fields and Mach number fluctuations in turbulence frequency bands are also evaluated,and are higher than those between radial electric fields and Mach number fluctuations.

关键词： zonal flow geodesic acoustic mode tokamak return flow Mach number

低杂波电流驱动下HT-7超导托卡马克等离子体硬X射线辐射研究

在线全文

学校读者我要写书评

暂无评论

核技术 2000年第12期23卷 846-850页

作者：石跃江凌必利万宝年丁伯江中国科学院等离子体物理研究所合肥230031

用７个ＮａＩ（Ｔ１）闪烁探测器组成的阵列观测能量范围在２０—５００ｋｅＶ，来自ＨＴ—７托卡马克等离子体的硬Ｘ射线轫致辐射。实验结果显示，硬Ｘ射线的径向辐射强度分布与低杂波的功率谱和等离子体的密度及磁场强度等放电参数密... 详细信息

用７个ＮａＩ（Ｔ１）闪烁探测器组成的阵列观测能量范围在２０—５００ｋｅＶ，来自ＨＴ—７托卡马克等离子体的硬Ｘ射线轫致辐射。实验结果显示，硬Ｘ射线的径向辐射强度分布与低杂波的功率谱和等离子体的密度及磁场强度等放电参数密切相关。通过测量不同放电参数下硬Ｘ射线的径向强度分布，研究低杂波在等离子体中传播和吸收机制。

关键词：托卡马克 NaT(Tl)闪烁探测器硬X射线辐射

Observation and characterization of the effect of electron cyclotron waves on toroidal rotation in EAST L-mode discharges

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2017年第10期19卷 14-19页

作者： Jun CHEN Ruiji HU Bo LYU Fudi WANG Xiaojie WANG Handong XU Yingying LI Jia FU Xianghui YIN Dajun WU Fukun LIU Qing ZANG Haiqing LIU yuejiang shi shifeng MAO Yi YU Baonian WAN Minyou YE Yongcai SHEN EAST team School of Nuclear Science and Technology University of Science and Technology of China Hefei 230026 People＇s Republic of China Institute of Plasma Physics Chinese Academy of Sciences Hefei 230031 People＇s Republic of China Department of Nuclear Engineering Seoul National University Seoul 151-742 Korea School of Physics and Electrical Engineering of Anqing Normal University Anqing 246011 People＇s Republic of China

The change in the toroidal rotation of plasma caused by electron cyclotron wave（ECW） injection has been observed in EAST. It is found that the response of the rotation is similar for all possible ECW toroidal injection angles. The core toroidal rotation velocity increases in the co-current direction along with a rise in the plasma temperature and stored energy. The profile of the electron temperature, ion temperature and toroidal rotation velocity gradually become *** change in toroidal rotation in the core increases with the ECW injection power. Different behavior is observed when the ECWs are injected into low hybrid current drive（LHCD） target plasmas, where the electron temperature and rotation profile become peaked, while the ion temperature profile flattens after ECW injection, suggesting different transport characteristics in energy and momentum.

关键词： ECW plasma toroidal rotation LHCD x-ray crystal spectrometer

An uncertainty investigation for liner impedance eduction methods

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第3期37卷 49-59页

作者： Weihao shi Xiaodong JING School of Energy and Power Engineering Beihang UniversityBeijing 100191China

Impedance eduction methods have been developed for decades to meet the increasing need for high-quality impedance data in the design and optimization of acoustic *** this end,it is important to fully investigate the uncertainty problem,to which only limited attention has been devoted so *** paper considers the possibility of acoustically-induced structural vibration as a nonnegligible uncertainty or error source in impedance eduction *** the frequency moves away from the resonant frequency,with the increase in the value of cavity reactance,the acoustic particle velocity inside liner orifices possibly decreases to the extent comparable to the vibration velocity of liner facing ***,the acoustically-induced vibration,although generally being weak except at the inherent structural frequencies,may considerably affect the impedance eduction results near the anti-resonant frequency where the liner has poor *** demonstrate the effect of structural vibration,the vibration velocity of liner facing sheet is estimated from the experimentally educed admittance of the liner samples whose orifices are sealed with ***,a three-dimensional numerical model is set up,in which normal particle velocity is introduced over the solid portion of liner facing sheet to imitate structural vibration,rather than directly solving the acoustic-structural coupling *** shown by the results,the vibration of liner facing sheet,whose velocity is as small as estimated by the experiment,can result in anomalous deviation of the educed impedance from the impedance model near the anti-resonant *** trend that the anomalous deviation varies with frequency is numerically captured.

关键词： Impedance eduction Uncertainty analysis Acoustically-induced structural vibration Anti-resonant frequency Perforated liner

No Reference Image Sharpness Assessment Based on Global Color Difference Variation

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2024年第1期33卷 293-302页

作者： Chenyang shi Yandan LIN School of Artificial Intelligence Anhui Polytechnic University School of Mechanical Engineering Anhui Polytechnic University Department of Light Sources and Illuminating Engineering Fudan University Academy for Engineering & Technology Fudan University

Image quality assessment(IQA) model is designed to measure the image quality in consistent with subjective ratings by computational models. In this research, a valid no reference IQA(NR-IQA) model for color image sharpness assessment is proposed based on local color difference map in a color space. In the proposed model, the absolute color difference variation and relative color difference variation are combined to evaluate sharpness in YIQ color space(a color coordinate system for the development of the United States color television system). The difference between sharpest and blurriest spot of an image is represented by the absolute color difference variation, and relative color difference variation expresses the variation in the image content. Extensive experiments are performed on five publicly available benchmark synthetic blur databases and two real blur databases, and the results prove that the proposed model work better than the other state-of-the-art and latest NR-IQA models for the prediction accuracy on blurry images. Besides, the model maintains the lowest computational complexity.

关键词： Image quality TV Image color analysis Databases Computational modeling Color Predictive models

Quantization and Event-Triggered Policy Design for Encrypted Networked Control

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 946-955页

作者： Yongxia shi Ehsan Nekouei the Department of Electrical Engineering City University of Hong KongHong KongChina

This paper proposes a novel event-driven encrypted control framework for linear networked control systems(NCSs),which relies on two modified uniform quantization policies,the Paillier cryptosystem,and an event-triggered *** to the fact that only integers can work in the Pailler cryptosystem,both the real-valued control gain and system state need to be first quantized before *** is dramatically different from the existing quantized control methods,where only the quantization of a single value,e.g.,the control input or the system state,is *** handle this issue,static and dynamic quantization policies are presented,which achieve the desired integer conversions and guarantee asymptotic convergence of the quantized system state to the ***,the quantized system state is encrypted and sent to the controller when the triggering condition,specified by a state-based event-triggered strategy,is *** doing so,not only the security and confidentiality of data transmitted over the communication network are protected,but also the ciphertext expansion phenomenon can be ***,by tactfully designing the quantization sensitivities and triggering error,the proposed event-driven encrypted control framework ensures the asymptotic stability of the overall closedloop ***,a simulation example of the secure motion control for an inverted pendulum cart system is presented to evaluate the effectiveness of the theoretical results.

关键词： Cyber-security encrypted control event-triggered control(ETC) networked control systems(NCSs) semi-homomorphic encryption