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Nonlinear Simulations of the Bump-on-Tail Instabilities in Tokamak Plasmas

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Chinese Physics Letters 2021年第4期38卷 67-70页

作者： Yumei Hou Wei Chen Liming Yu Yunpeng Zou Min Xu xuru duan Southwestern Institute of Physics Chengdu 610041China

We reproduce nonlinear behaviors,including frequency chirping and mode splitting,referred to as bump-on-tail *** has been reported in previous works,the generation and motion of phase-space hole-clump pairs in a kinetically driven,dissipative system can result in frequency *** provide examples of frequency chirping,both with and without pure diffusion,in order to illustrate the role of the diffusion effect,which can suppress holes and clumps;Asymmetric frequency chirpings are produced with drag effect,which is essential to enhance holes,and suppress *** both diffusion and drag effect suppress the clumps,downward sweepings are observed,caused by a complicated interaction of diffusion and *** addition,we examine the discrepancies in frequency chirping between marginally unstable,and far from marginally unstable cases,which we elucidate by means of a dissipative *** addition,mode splitting is also produced via BOT code for a marginal case with large diffusion.

关键词： diffusion splitting dissipative

Study of nonlinear mode–mode couplings between Alfvénic modes by the Fourier bicoherence and Lissajous-curve technique in HL-2A

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Plasma Science and Technology 2019年第7期21卷 97-105页

作者： Yumei HOU Wei CHEN Yi YU xuru duan Min XU Minyou YE HL-2A Team School of Physical Sciences University of Science and Technology of ChinaHefei 230026People’s Republic of China Southwestern Institute of Physics Chengdu 610041People’s Republic of China

Nonlinear couplings of various Alfvén modes driven by energetic particles in HL-2 A are addressed by employing the Fourier bicoherence and Lissajous-curve technique. Long-lived modes and high-frequency coherent modes are presented. Then the squared bicoherence of three waves establishes the existence of three-wave coupling. Lissajous-curves of those waves manifest that their phases are locked, which again confirms that they are nonlinearly coupled to each other. Moreover, coupled modes triggered by supersonic molecular beam injection are investigated. The phase evolution of them is given by the Lissajous-curve. Further details of phase-flip and phase-slip are presented and discussed.

关键词： nonlinear mode-mode coupling Alfvén modes Fourier bicoherence Lissajous-curve

Exploring the High-efficiency Clash Detection between Architecture and Structure

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Exploring the High-efficiency Clash Detection between Archit...

Optical design of the Lyman alpha based beam emission spectroscopy (LAB) diagnostic on the HL-2A tokamak

2011 International Conference on Information Management and Engineering(ICIME 2011)

作者： Wang Guangbin Lei Wei duan xuru School of Economics and Management Tongji University

ISBN: (纸本)9781612842387

Building Information Modeling (BIM) has recently attained widespread attention in the AEC/FM (Architectural, Engineering and Construction/Facilities Management) industry. However, the adoption of BIM is under expectation. Clash detection is critical for adopting BIM, because it is the main part to use for calculating for ROI (return of investment). At the same time, efficiency problem arises in the course of the practical application of clash detection: While existing commercial clash detection software can provides an army of clashes, yet it still need handwork to distinguish design errors from modeling errors. To improve this low-efficiency process, This research provide a revised work process utilizing space naming and coding based on Product Breakdown Structure(PBS), then introduces a case of Shanghai West Railway Station in *** to text this revised process.

关键词： Adoption of information technology in organizations, Object-oriented enterprise modeling, Building Information Model, model checking clash detection, return on investment, Product Breakdown Structure, information technology

来源： cnki会议评论

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Plasma Science and Technology 2021年第7期23卷 45-52页

作者： Yixuan ZHOU Huajie WANG Yi YU Yihang CHEN Rui KE Min XU Chijie XIAO Zhanhui WANG Jiquan LI xuru duan Minyou YE Southwestern Institute of Physics Chengdu 610041People’s Republic of China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026People’s Republic of China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871People’s Republic of China

In this article,we present the optical design of a novel diagnostic on the HL-2A tokamak,*** 20-channel edge Lyman-alpha beam emission spectroscopy,which is a promising solution for edge density turbulence research on tokamaks,as it offers the possibility of density fluctuation measurement with a 3.3 mm spatial resolution while maintains a high temporal resolution of 1μ*** optical path,including the reflective collection optics,the high-dispersion spectrometer,and the linear detector array,is carefully optimized to obtain a good image quality and a high *** maximum root mean square radius of the collection optics is 64μ*** detected photon flux is estimated to be about 1011 photons/s/channel.

关键词： Lyman-alpha line LAB BES density fluctuation diagnostic

Experimental Base of an Innovation S-Channel to Reduce MHD Pressure Drop

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World Journal of Nuclear Science and Technology 2012年第1期2卷 29-35页

作者： Zengyu Xu Chuanjie Pan Xiujie Zhang xuru duan Yong Liu 不详

Consequent on MHD geometry sensibility phenomena was measured in an accident case;the more detail experiments have been conducted at the liquid metal experimental loop upgrade facility (LMEL-U). The experimental results indicate that MHD pressure drop can be greatly reduced in the special designed ducts. Base on the experimental data, an innovation channel concept (tentatively called as the secondary flow channel, short in “S-channel”) is addressed as a reducing MHD pressure drop channel for the application of a liquid metal blanket system in fusion reactor. It may be a dawn for solving MHD pressure drop key issue of liquid metal blanket system.

关键词： Liquid Metal Blanket MHD Effect Pressure Drop S-channel

Recent progress in Chinese fusion research based on superconducting tokamak configuration

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The Innovation 2022年第4期3卷 61-73页

作者： Jinxing Zheng Jinggang Qin Kun Lu Min Xu xuru duan Guosheng Xu Jiansheng Hu Xianzu Gong Qing Zang Zhihong Liu Liang Wang Rui Ding Jiming Chen Pengyuan Li Lei Xue Lijun Cai Yuntao Song Institute of Plasma Physics Hefei Institute of Physical ScienceChinese Academy of SciencesHefei 230031China Southwestern Institute of Physics Chengdu 610041China

Fusion energy is a promising source of clean energy,which could solve energy shortages and environmental *** into controlled fusion energy has been ongoing for over half a *** has created a clear roadmap for magnetic confinement fusion development,where superconducting tokamaks will be used in commercial fusion *** Experimental Advanced Superconducting Tokamak(EAST)is the world’s first fully superconducting tokamak with upper and lower divertors,which aims at longpulse,steady-state,H-mode operation,and 101-s H-mode discharge had been *** 2007,China joined the International Thermonuclear Experimental Reactor(ITER)and became one of its seven *** procurement packages are undertaken by China,covering superconducting magnets,power supplies,plasma-facing components(PFCs),diagnostics,*** bridge the gap between the ITER and fusion demonstration power plants(DEMOs),China is planning to build the Chinese Fusion Engineering Testing Reactor(CFETR)to demonstrate related technologies and physics *** engineering design of the CFETR was completed in 2020,and Comprehensive Research Facilities for Fusion Technology(CRAFT)are being constructed to explore the key technologies used in the CFETR.

关键词： tokamak configuration covering

Dynamics of oscillatory plasma flows prior to the H-mode in the HL-2A tokamak

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Plasma Science and Technology 2017年第7期19卷 1-6页

作者： Wulyu ZHONG Xiaolan ZOU Zhongbing SHI xuru duan Min X Zengchen YANG Peiwan SHI Min JIANG Guoliang XIAO Xianming SONG Jiaqi DONG Xuantong DING Yong LIU HL- Southwestern Institute of Physics P O Box 432 Chengdu 610041 People＇s Republic of China CEA IRFM F-13108 Saint-Paul-lez-Durance France Institute for Fusion Theory and Simulation Zhejiang University Hangzhou 310027 People＇s Republic of China

This paper discusses edge oscillatory plasma flows, geodesic acoustic mode （GAM） and limit cycle oscillations （LCOs）, which have been measured by Doppler reflectometry prior to the high confinement mode （H-mode） in the HL-2A tokamak. The complex relations between the flows and background turbulence have been analyzed. It was observed that the GAM and LCO coexist, and these two flows and turbulence have strong nonlinear interactions during the intermediate confinement phase （I-phase）. Dynamics of the shear flows and turbulence prior to the H-mode shows that the oscillatory flows quench the turbulence along with the increase of the mean E x B flow at the early stage of the I-phase, then the oscillatory flows are damped and the further increased mean flow takes over the role in turbulence suppression. The reduced turbulent transport results in the formation of a steep edge transport barrier. It suggests that the oscillatory flows can initiate the L-H transition through providing a positive feedback for the increase of the mean E × B flow strength.

关键词： plasma shear flow turbulence L-H transition H-mode microwave reflectometry

Siliconization for Wall Conditioning in the HL-2A Tokamak

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Southwestern Institute of Physics Annual Report

Southwestern Institute of Physics Annual Report 2005年第1期 43-44页

作者： CAO Zeng CUI Chenghe CAI Xiao GAO Xiaoyan duan xuru PAN Yudong LI Quang

The sputtering of impurities is caused by the interactions between plasma and the first wall, and the recycling of the gas affects the particle and energy transport of plasmas with a complicated mechanism in plasma operation. It is important for present tokarnaks to achieve a good confinement and high performance plasmas by means of controls of the vacuum condition, usage of low Z materials, control of the recycling of neutral particles and suppressions of the appearances and yield of impurities. For higher plasma parameters, some of the first wall of HL-2A is covered with graphite materials and carbon fiber tiles. Hence the studies on the in-situ coating application and development, and the interactions between the coating film and plasma are needed to effectively control the impurity, improve plasma confinement and achieve high performance plasma.

关键词： Siliconization Discharge improvement Density limits

Observation of Multiple Broadband Alfvénic Chirping Modes in HL-2A NBI Plasmas

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Chinese Physics Letters 2021年第5期38卷 41-45页

作者： Liming Yu Wei Chen Xiaoquan Ji Peiwan Shi Xuantong Ding Zhongbing Shi Ruirui Ma Yumei Hou Yonggao Li Jiaxian Li Jianyong Cao Wulyu Zhong Min Xu xuru duan Southwestern Institute of Physics Chengdu 610041China Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024China

Multiple broadband Alfvenic chirping modes(CMs),with frequencies in the wide range of f-35-150 kHz and chirping down rapidly,are found in HL-2A neutral beam injection plasmas,and the CMs can even *** frequency chirping down process can be completed within-1 ms,and the frequency shift can reach 30-50 *** CMs propagate in ion diamagnetic drift directions *** toroidal mode number is confirmed to be n=1,2,3 and 4 for the f-35-65,55-90,70-120 and 100-150 kHz CMs,*** CMs are more like to be energetic-particle continuum modes(EPMs),since the modes almost locate on the Alfven continuum.

关键词： kHz Observation of Multiple Broadband Alfv nic Chirping Modes in HL-2A NBI Plasmas NBI