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FEQ:a new flux coordinates based equilibrium solver including both magnetic axis and separatrix

Plasma Science and Technology 2022年第1期24卷 36-46页

作者： Xinhao JIANG youwen sun Institute of Plasma Physics HFIPSChinese Academy of SciencesHefei 230031People's Republic of China University of Science and Technology of China Hefei 230026People’s Republic of China

Accurate tokamak plasma equilibrium solution in flux coordinates is crucial for many stability and transport *** approaches for dealing with singularities in solving the nonlinear Grad-Shafranov(GS)equation in flux coordinates or also known as straight field line coordinates are proposed in this *** GS equation is solved by iterating the position of grids directly in flux coordinates,and hence,no additional errors are introduced due to mapping process for a convergent *** singularity at magnetic axis in flux coordinates is removed by using a novel coordinate transform *** from other techniques previously developed,no assumption in boundary condition at magnetic axis is *** is consistent with the fact that there is no physical boundary at the magnetic axis.A flux coordinate system with poloidal coordinate chosen as the geometric poloidal angle is *** conquers the difficulty in no definition of poloidal coordinate in flux coordinates at separatrix because of the singularity at x-point(s)in a divertor *** also simplifies the process for computing poloidal flux coordinate during the iteration for solving the nonlinear GS ***-uniform grids can be applied in both radial and poloidal coordinates,which allows it to increase the spacial resolution near x-point(s)in a divertor *** on the model proposed in this paper,a new Flux coordinates based EQuilibrium solver(FEQ)in tokamaks is *** numerical solutions from this code agree well with both the analytic Solov’ev solution and the numerical one from the EFIT code for a divertor configuration in the EAST *** code can be applied for simulating different equilibria with prescribed shape,pressure and current profiles,*** both limiter and divertor configurations,positive triangularity and negative triangularity,differentβ,arbitrary magnetic shear profile *** provides a powerful and convenient fixed-boundar

关键词： equilibrium flux coordinates tokamak

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Palladium-Catalyzed Formal [4＋2] Cycloaddition of Benzoic and Acrylic Acids with 1,3-Dienes via C-H Bond Activation： Efficient Access to 3,4-Dihydroisocoumarin and 5,6-Dihydrocoumalins

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Chinese Journal of Chemistry 2018年第8期36卷 708-711页

作者： youwen sun Guozhu Zhang State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Center for Excellence in Molecular Synthesis University of Chinese Academy of Sciences Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China

We report a palladium-catalyzed formal intermolecular [4＋2] cycloaddition of benzoic and acrylic acids with 1,3-dienes including the stock chemicals 1,3-butadiene and isoprene leading to synthetically useful 3,4-dihydroisocoumarins and 5,6-dihydrocoumalins. Stepwise C-H bond cleavage and annulation are likely involved in the reaction pathway. The synthetic potential of the methodology was demonstrated by two short derivatizations and total synthesis of natural product Clausamine B.

关键词： palladium(ll) C-H bond activation 1,3-diene cycloaddition natural product

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Spatiotemporal variation and source analysis of air pollutants in the Harbin-Changchun (HC) region of China during 2014e2020

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Environmental Science and Ecotechnology 2021年第4期8卷 67-74页

作者： Yulong Wang youwen sun Zhiqing Zhang Yuan Cheng State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090China Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsChinese Academy of SciencesHefei230031China

This study analyzed the characteristics of air pollution and specific pollution periods within the HarbinChangchun(HC)metropolitan area during *** annual,seasonal,and monthly variations of the six pollutants,the change trend in 11 cities of HC showed strong consistency in spatial *** western cities(Songyuan,Daqing,and Siping)were vulnerable to dust storms from Inner *** concentrations of all air pollutants,except O3-8h,showed downward fluctuation trends from 2014 to 2018 and remained stable from 2018 to 2020 in terms of annual *** interannual trend of significant reductions in SO2 and SO2/PM2.5 during the heating period indicated that strict emission reduction measures posed by the government were highly *** ratio of PM2.5/SO2 was used to identify open biomass burning(OBB),which showed a double peak(OctobereNovember(OcteNov),MarcheApril(MareApr)).The burning prohibition shifted the OBB from OcteNov to Mar eApr.

关键词： Air pollution Spatiotemporal variations Harbin-changchun metropolitan area Open biomass burning

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Formation of secondary inorganic aerosol in a frigid urban atmosphere

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Frontiers of Environmental Science & Engineering 2022年第2期16卷 39-50页

作者： Yuan Cheng Qinqin Yu Jiumeng Liu youwen sun Linlin Liang Zhenyu Du Guannan Geng Wanli Ma Hong Qi Qiang Zhang Kebin He State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsChinese Academy of SciencesHefei 230031China State Key Laboratory of Severe Weather&CMA Key Laboratory of Atmospheric Chemistry Chinese Academy of Meteorological SciencesBeijing 100081China National Research Center for Environmental Analysis and Measurement Environmental Development Center of the Ministry of Ecology and EnvironmentBeijing 100029China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China Department of Earth System Science Tsinghua UniversityBeijing 100084China

Formation of secondary inorganic aerosol(SIA)was investigated during a six-month long heating season in Harbin,*** sulfate formation was observed at high relative humidity(RH),with the same threshold RH(80%)for both colder and warmer measurement *** to wintertime results from Beijing,the threshold RH was considerably higher in Harbin,whereas the RH-dependent enhancement of sulfur oxidation ratio(SOR)was less *** addition,the high RH events were rarely encountered,and for other periods,the SOR were typically as low as~***,the sulfate formation was considered inefficient in this *** excluding the several cases with high RH,both SOR and the nitrogen oxidation ratio(NOR)exhibited increasing trends as the temperature increased,with the increase of NOR being *** nitrate to sulfate ratio tended to increase with increasing temperature as *** on a semi-quantitative approach,this trend was attributed primarily to the temperature-dependent variations of precursors including SO_(2) and NO_(2).The influence of biomass burning emissions on SIA formation was also *** stronger impact of biomass burning,an enhancement in NOR was observed whereas SOR was largely *** different patterns were identified as the dominant driver of the larger nitrate to sulfate ratios measured at higher concentrations of fine particulate matter.

关键词： Haze Sulfate Nitrate Heterogeneous chemistry Biomass burning

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Vertical aerosol data assimilation technology and application based on satellite and ground lidar:A review and outlook

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Journal of Environmental Sciences 2023年第1期123卷 292-305页

作者： Ting Yang Hongyi Li Haibo Wang youwen sun Xi Chen Futing Wang Lei Xu Zifa Wang State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry(LAPC) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHFIPSChinese Academy of SciencesHefei 230031China University of Chinese Academy of Sciences Beijing 100049China Department of Precision Machinery and Precision Instrumentation University of Science and Technology of ChinaHefei 230026China

Observations and numerical models are mainly used to investigate the spatiotemporal distribution and vertical structure characteristics of aerosols to understand aerosol pollution and its ***,the limitations of observations and the uncertainties of numerical models bias aerosol calculations and *** assimilation combines observations and numerical models to improve the accuracy of the initial,analytical fields of models and promote the development of atmospheric aerosol pollution *** studies have been conducted to integrate multi-source data,such as aerosol optical depth and aerosol extinction coefficient profile,into various chemical transport models using various data assimilation algorithms and have achieved good assimilation *** definition of data assimilation and the main algorithms will be briefly presented,and the progress of aerosol assimilation according to two types of aerosol data,namely,aerosol optical depth and extinction coefficient,will be *** application of vertical aerosol data assimilation,as well as the future trends and challenges of aerosol data assimilation,will be further analysed.

关键词： Atmospheric pollution Atmospheric environment Air quality modelling Aerosol assimilation

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Atmospheric environment monitoring technology and equipment in China:A review and outlook

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Journal of Environmental Sciences 2023年第1期123卷 41-53页

作者： youwen sun Ting Yang Huaqiao Gui Xin Li Weigang Wang Jun Duan Shushuai Mao Hao Yin Bin Zhou Jianlei Lang Haijin Zhou Cheng Liu Pinhua Xie Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsHFIPSChinese Academy of SciencesHefei 230031China Department of Precision Machinery and Precision Instrumentation University of Science and Technology of ChinaHefei 230026China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China State Key Laboratory for Structural Chemistry of Unstable and Stable Species Institute of ChemistryChinese Academy of SciencesBeijing 100190China Key Laboratory of Beijing on Regional Air Pollution Control College of Environmental&Energy EngineeringBeijing University of TechnologyBeijing 100124China Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3) Department of Environmental Science and EngineeringFudan UniversityShanghai 200438China Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes University of Science and Technology of ChinaHefei 230026China Anhui Province Key Laboratory of Polar Environment and Global Change University of Science and Technology of ChinaHefei 230026China

Accurate monitoring of the atmospheric environment and its evolution are important for understanding the sources,chemical mechanisms,and transport processes of air pollution and carbon emissions in China,and for regulatory and control *** study gives an overview of atmospheric environment monitoring technology and equipment in China and summarizes the major achievements obtained in recent *** has made great progress in the development of atmospheric environment monitoring technology and equipment with decades of *** manufacturing level of atmospheric environment monitoring equipment and the quality of products have steadily improved,and a technical&production system that can meet the requirements of routine monitoring activities has been *** is expected that domestic atmospheric environment monitoring technology and equipment will be able to meet future demands for routine monitoring activities in China and provide scientific assistance for addressing air pollution problems.

关键词： Atmospheric pollution Atmospheric environment Atmospheric monitoring Environmental instrument

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Magnetic field topology modeling under resonant magnetic perturbations on EAST

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Plasma Science and Technology 2019年第6期21卷 98-105页

作者： Jie HUANG Yasuhiro SUZUKI Yunfeng LIANG Manni JIA youwen sun Nan CHU Jichan XU Muquan WU 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 National Institutes of Fusion Sciences National Institutes of Natural Sciences Oroshi-cho 322-6 Toki 509-5292 Japan SOKENDAI The Graduate University for Advanced Studies Oroshi-cho 322-6 Toki 509-5292 Japan Institute for Energy and Climate Reserch-Plasma Physics Forschungszentrum Juelich Association EURATOM-FZJ Trilateral Euregio Cluster D-52425 Juelich Germany

In order to understand the mechanism by which the resonant magnetic perturbation (RMP)mitigates or suppresses the edge-localized mode (ELM),the topological study of the edge magnetic field in ELM mitigation or suppression phase is a critical *** model the three-dimensional magnetic field topology superposed RMP on Experimental Advanced Superconducting Tokamak,a numerical model using the field line tracing method for both vacuum and ideal plasma response approximations is *** the numerical model,the topological change and the penetration depth of the stochastic field lines in the edge magnetic field are studied in an RMP *** profiles of minimum9 on edge stochastic field lines and the particle flux pattem,the ideal plasma response changes the field line penetration depth while remaining similar profile relative to vacuum *** mitigate and suppress ELM strongly,the deep penetration of RMP fields and topological changes of the edge magnetic field is a key from our modeling.

关键词： magnetic topology ideal plasma response tokamaks resonant magnetic perturbation

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Suppression and mitigation of inter-ELM high-frequency Alfvén-like mode by resonant magnetic perturbation in EAST

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Plasma Science and Technology 2021年第9期23卷 7-12页

作者： Jiquan ZHAO youwen sun Nan CHU Tonghui SHI Qun MA Yumin WANG Kaiyang HE Youjun HU EAST Team Institute of Plasma Physics HFIPSChinese Academy of Sciences University of Science and Technology of China Hefei 230026People's Republic of China

Suppression and mitigation of a high-frequency Alfvén-like mode(HFAM)between type-I edge localized modes(ELMs)during ELM mitigation by resonant magnetic perturbation(RMP)is observed for the first time in the EAST *** mode is located near the edge pedestal *** modeling result of the Alfvén continuum shows that the HFAM is located near the elipical Alfvén eigenmode(EAE)*** the application of n=1 RMP for ELM mitigation,the HFAM can be fully suppressed when the RMP amplitude exceeds a threshold,below which the HFAM is *** suppression is caused by a reduction of pedestal height induced by *** the case using n=3 RMP,the mode is localized toroidally at specific phase depending on the phase of applied RMP,*** in the three-dimensional equilibrium formed by *** dominant toroidal mode number of HFAM is around n=-6 and it reduces to-3 during the application of n=3 RMP,which indicates the existence of possible nonlinear coupling between the HFAM and *** the negative mode number denotes that the mode rotates in electron diamagnetic drift *** observation reported here improves the understanding of pedestal dynamics and its stability in RMP ELM control.

关键词： Alfvén-like mode RMP HFAM mode inter-ELM

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Plasma-tungsten interactions in experimental advanced superconducting tokamak(EAST)

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Tungsten 2019年第2期1卷 122-131页

作者： Fang Ding Guang-Nan Luo Xiahua Chen Hai Xie Rui Ding Chaofeng Sang Hongmin Mao Zhenhua Hu Jing Wu Zhen sun Liang Wang youwen sun Jiansheng Hu 无 Institute of Plasma Physics Chinese Academy of SciencesHefei 230031China Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Ministry of Education)School of PhysicsDalian University of TechnologyDalian 116024China the EAST Team

Tungsten(W)is used as the armor material of the International Thermonuclear Experimental Reactor(ITER)divertor and is regarded as the potential first wall material of future fusion *** of the key challenges for the successful application of W in fusion devices is effective control of W at an extremely low concentration in *** and control of W erosion are not only a prerequisite for W impurity control,but also vital concerns to plasma-facing component(PFC)*** the application of ITER-like water-cooled full W divertor in EAST in 2014,great efforts were made to inves-tigate W erosion by experiment and simulation.A spectroscopic system was developed to provide a real-time measurement of W sputtering *** experiment and simulation results indicate that carbon(C)is the dominant impurity causing W sputtering in L-mode plasmas,which comes from the erosion of C plasma-facing material(PFM)in the lower divertor and the main chamber *** mixture layer on the surface of W PFCs formed through redeposition or the wall coating can effectively suppress W *** the plasma density and radiation can reduce incident ion energy,thus alleviating W *** H-mode plasmas,control of edge localized mode(ELM)via resonant magnetic perturbation(RMP)proves to be capable of suppressing intra-ELM W *** experiences and lessons from the EAST W divertor are beneficial to the design,manufacturing and operation of ITER and beyond.

关键词： Divertor Tungsten sputtering Erosion EAST Spectroscopy

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Summary of the 11th Conference on Magnetic Confined Fusion Theory and Simulation

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Plasma Science and Technology 2024年第10期26卷 1-7页

作者： Guangzhou HAO Jianqiang XU youwen sun Zhibin GUO Organizing Committee of the 11th Conference on Magnetic Confined Fusion Theory and Simulation Southwestern Institute of Physics Chengdu 610041People’s Republic of China Institute of Plasma Physics Hefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031People’s Republic of China State Key Laboratory of Nuclear Physics and Technology Fusion Simulation CenterSchool of PhysicsPeking UniversityBeijing 100871People’s Republic of China 不详

This conference report summarizes recent progress in plasma theory and simulation that was presented in contributed papers and discussions at the 11th Conference on Magnetic Confined Fusion Theory and Simulation(CMCFTS)held in Chengdu,China,27–30 October,*** in various fields has been *** example,results on zonal flow generation by mode coupling,simulations of the key physics of divertor detachment,energetic particle effects on magnetohydrodynamic(MHD)modes in addition to ion-and electron-scale turbulence,physics of edge coherent modes and edge-localized modes,and the optimization of ion heating schemes as well as confinement scenarios using advanced integrated modeling are presented at the *** this conference,the scientific research groups were organized into six categories:(a)edge and divertor physics;(b)impurity,heating,and current drive;(c)energetic particle physics;(d)turbulent transport;(e)MHD instability;and(f)integrated modeling and code development.A summary of the highlighted progress in these working groups is presented.

关键词： magnetic confined fusion(MCF) theory and simulation modeling tokamak

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