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Upgrade of an integrated Langmuir probe system on the closed divertor target plates in the HL-2A tokamak

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Plasma Science and Technology 2022年第5期24卷 9-16页

作者：黄治辉程钧吴娜严龙文徐红兵王威策苗祥淦弋开阳许建强才来中石中兵董家齐刘仪钟武律杨青巍许敏段旭如 Southwestern institute of physics Chengdu 610041People’s Republic of China institute of fusion Science School of Physical Science and TechnologySouthwest Jiaotong UniversityChengdu 610031People’s Republic of China institute for fusion theory and simulation Zhejiang UniversityHangzhou 310027People’s Republic of China

A newly designed divertor Langmuir probe diagnostic system has been installed in a rare closed divertor of the HL-2A tokamak and steadily operated for the study of divertor physics involved edge-localized mode mitigation,detachment and redistribution of heat flux,etc.Two sets of probe arrays including 274 probe tips were placed at two ports(approximately 180°separated toroidally),and the spatial and temporal resolutions of this measurement system could reach6 mm and 1μs,respectively.A novel design of the ceramic isolation ring can ensure reliable electrical insulation property between the graphite tip and the copper substrate plate where plasma impurities and the dust are deposited into the gaps for a long experimental time.Meanwhile,the condition monitoring and mode conversion between single and triple probe of the probe system could be conveniently implemented via a remote-control station.The preliminary experimental result shows that the divertor Langmuir probe system is capable of measuring the high spatiotemporal parameters involved the plasma density,electron temperature,particle flux as well as heat flux during the ELMy H-mode discharges.

关键词： Langmuir probe H-mode discharge HL-2A tokamak divertor physics

Numerical analysis of high Mach flow and flow reversal in the experimental advanced superconducting tokamak divertor

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Chinese physics B 2011年第9期20卷 276-281页

作者：欧靖杨锦宏 institute of Plasma physics Chinese Academy of Sciences Center for Magnetic fusion theory Chinese Academy of Sciences

The B2-Eirene （SOLPS 4.0） code package is used to investigate the plasma parallel flow, i.e., the scrape-off layer （SOL） flow, in the experimental advanced superconducting tokamak （EAST） divertor. simulation results show that the SOL flow in the divertor region can exhibit complex behaviour, such as a high Mach flow and flow reversal in different plasma regimes. When the divertor plasma is in the detachment state, the high Mach flow with approaching or exceeding sonic speed is observed away from the target plate in our simulation. When the divertor plasma is in the high recycling ~tate, the flow reversM with a ~mall Mach number （IMI 〈 0.2） is observed near the X-point along the separatrix region. The driving mechanisms for the high Mach flow and the reversed flow are analysed theoretically through momentum and continuity equations, respectively. The profile of the ionization sources is shown to be a possible formation condition causing the complex behaviour of the SOL flow. In addition, the effects of the high Mach flow and the flow reversal on the impurity transport are also discussed in this paper.

关键词： hiuh Mach flow flow reversal ionization source divertor I）lasma

A Self-Consistent Analysis of Impurity Radiation by SOL-PSI Model

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Plasma Science and Technology 2010年第2期12卷 149-155页

作者：金乐朱思铮 institute of Plasma physics Chinese Academy of Sciences Center for Magnetic fusion theory Chinese Academy of Sciences

A model of scrape-off layer （SOL）-plasma surface interaction （PSI） coupling is pre- sented for divertor operation. This model can treat the interrelation between impurity production and impurity radiation self-consistently. The model is based on a ＇two-point＇ model and a 0-D steady state impurity particle balance model. The fraction of power radiated in SOL is calcu- lated as a function of the line average density. Compared to the former simple coupling model, this model takes into account the wall-produced impurities that are sputtered by charge-exchange （CX） neutrals. A simple retention factor is also added in this model. A comparison with the experiments is made. The simulation results show the same trend upon the plasma density as shown in experiments. Reasonable qualitative agreement is reached between the results by using the model and those from experiments through the adjustment of the fitted factor.

关键词： plasma surface interactions impurities sputtering ＇Two-point＇ model coupled model

Insight of Natural Compounds Halimane Diterpenoids against Mycobacterium tuberculosis: Virtual Screening, DFT, Drug-Likeness, and Molecular Dynamics Approach

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Computational Molecular Bioscience 2024年第2期14卷 35-58页

作者： Laurent Gael Eyia Andiga Boris Davy Bekono Désiré Mama Bikele Pie Pascal Onguéné Amoa Luc Calvin Owono Owono Luc Léonard Mbaze Meva’a department of Chemistry Faculty of Science University of Douala Douala Cameroon department of physics Ecole Normale Suprieure University of Yaound 1 Yaound Cameroon Center for Drug Discovery Faculty of Science University of Buea Buea Cameroon department of Chemistry University of Yaound I Institute of Wood Technology Mbalmayo Cameroon CEPAMOQ Faculty of Science University of Douala Douala Cameroon

In the purpose to design novel antituberculosis (anti-TB) drugs agents against Mycobacterium tuberculosis (Mtb), we have built a molecular library around 42 Halimane Diterpenoids isolated from natural sources. Two Mtb enzymes drug targets (Mtb Mycothiol S-transferase and Mtb Homoserine transacetylase) have been adopted. The pharmacological potential was investigated through molecular docking, molecular dynamics simulation, density functional theory (gas phase and water) and ADMET analysis. Our results indicate that (2R,5R,6S)-1,2,3,4,5,6,7,8-octahydro-5-((E)-5-hydroxy-3-methylpent-3-enyl)-1,1,5,6-tetramethylnaphtha-lene-2-ol (compound 20) has displays higher docking score with each of the selected drug targets. In addition, this molecule exhibits a satisfactory drug potential activity and a good chemical reactivity. Its improved kinetic stability in the Mtb Mycothiol S-transferase enzyme reflects its suitability as a novel inhibitor of Mtb growth. This molecule has displayed a good absorption potential. Our results also show that its passive passage of the intestinal permeability barrier is more effective than that of first-line treatments (ethambutol, isoniazid). In the same way, this anti-TB druglikeness has shown to be able to cross the blood brain barrier.

关键词： Antituberculosis Druglikeness Density Functional theory Halimane Diterpenoids Molecular Docking Molecular Dynamics simulation

simulation on the transition of electrostatic instabilities in EAST steady-state scenario

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Plasma Science and Technology 2023年第5期25卷 20-30页

作者：马连杰张德兵虞立敏薛二兵张先梅黄娟肖湧龚先祖钱金平 EAST Team department of physics East China University of Science and TechnologyShanghai 200237People’s Republic of China institute of Plasma physics Chinese Academy of ScienceHefei 230031People’s Republic of China institute for fusion theory and simulation Zhejiang UniversityHangzhou 310027People’s Republic of China

The parameter dependence of transition between electrostatic instabilities is studied using gyrokinetic simulation based on a real discharge of steady-state scenario in the Experimental Advanced Superconducting Tokamak.The scan of radial locations shows that trapped electron mode(TEM)dominates around the core while the ion temperature gradient mode(ITG)simultaneously dominates outside.The maximum growth rate of TEM appears aroundρ=0.24,where the maximum electron temperature gradient R/LTelocates,ρis the normalized poloidal flux.Effects of the parameters on the transition between TEM and ITG instability are studied atρ=0.24.It is found that TEM dominates in the scanning with individually changing R/LTe from 2.50 to 25.02 or the density gradient R/L_(n)from 1.38 to 13.76.Meanwhile,the electron-ion temperature ratio T_(e)/T_(i)is found to destabilize TEM,the effect of Teis more sensitive than that of T_(i).The dominant instability diagrams in the(R/L_(Te),R/L_(Ti))plane at different T_(e)/T_(i)and R/Lnare numerically obtained,which clearly show the parameter range of the dominant TEM or dominant ITG instability region.It is found that the dominant TEM region becomes narrower in the plane by decreasing R/L_(n)when T_(e)/T_(i)>0.5.

关键词： gyrokinetic simulation EAST TEM ITG

Evolution of Small Scale Density Perturbations of Plasma and Charged Aerosol Particles in Polar Mesospheric Summer Echoes (PMSE) Layers

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Plasma Science and Technology 2011年第5期13卷 550-556页

作者：胡祖权陈银华郑聚高刘昊郁明阳吴剑 Key Laboratory of Basic Plasma physics Chinese Academy of Sciencesand Department of Modern PhysicsUniversity of Science and Technology of China institute for fusion theory and simulation Department of PhysicsZhejiang University institute für Theoretische Physik Ruhr-Universitt Bochum National Key Laboratory of Electromagnetic Environment China Research Institute of Radiowave Propagation

Time evolution of ionospheric D-region plasmas including the perturbations of electrons and charged aerosol particles is investigated under the conditions of polar mesosphere summer echoes （PMSE）. It is shown that the time scale of decay of the electron density is in the order of an hour under typical PMSE conditions, in the majority of cases, the electron density is anticorrelated to the ion density, except that the radius of aerosol particles is greater than 50 nm. Also, the evolutions under varied parameters, such as the amplitude and width of perturbation, the aerosol particle radius, and the altitude of the PMSE occurrence are investigated. The obtained results are useful for interpreting the experimental observations.

关键词： plasma small scale structure charged aerosol particle evolution

simulation of Heating with the Waves of Ion Cyclotron Range of Frequencies in Experimental Advanced Superconducting Tokamak

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Plasma Science and Technology 2010年第1期12卷 20-26页

作者：杨程朱思铮张新军 institute of Plasma physics Chinese Academy of Sciences Center for Magnetic fusion theory Studies Chinese Academy of Sciences

simulation on the heating scenarios in experimental advanced superconducting tokamak （EAST） was performed by using a full wave code TORIC. The locations of resonance layers for these heating schemes are predicted and the simulations for different schemes in ICRF experiments in EAST, for example, ion heating （both fundamental and harmonic frequency） or electron heating （by direct fast waves or by mode conversion waves）, on-axis or off-axis heating, and high- field-side （HFS） launching or low-field-side （LFS） launching, etc, were conducted. For the on-axis minority ion heating of 3He in D（3He） plasma, the impacts of both density and temperature on heating were discussed in the EAST parameter ranges.

关键词： ICRF TORIC mode-conversion heating with minority ions poloidal mode on-axis off-axis IBW ICW

Study of Heat Transport Across a Quasi-Stochastic Magnetic Field in Magnetic Confined Plasma physics

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Plasma Science and Technology 2009年第6期11卷 657-660页

作者：高宏 institute of Plasma physics Chinese Academy of Sciences Center for Magnetic fusion theory Chinese Academy of Sciences

Heat diffusion across a non-local quasi-stochastic magnetic field in tokamak plasma is numerically studied. The perturbed magnetic field is found to be a key factor in influencing effective radial heat conductivity whether the magnetic field is stochastic or not. Being different from previous work, a non-local perturbed magnetic field is used. Analytical results and numerical simulation results are compared between the conditions with a full and a quasi-perturbed stochastic field. The analytical results are found to be still consistent with numerical simulation results when the perturbed field is quasi-stochastic.

关键词： tokamak heat diffusion perturbed stochastic field

Spectral Broadening of Ion Bernstein Wave Due to Parametric Decay Instabilities

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Chinese physics Letters 2016年第8期33卷 73-76页

作者：甘春芸项农于治 institute of Plasma physics Chinese Academy of Sciences Center for Magnetic fusion theory Chinese Academy of Sciences

The parametric decay instabilities （PDIs） of ion Bernstein wave with different input power levels are investigated via particle-in-cell simulation. It is found that the number of decay channels increases with the input power. Resonant mode-mode couplings dominate for a low input power. With increasing the input power, the nonresonant PDIs appear to dissipate the energy of the injected wave and give rise to edge ion heating. The generated child waves couple with each other as well as the injected wave and /or act as a pump wave to excite new decay channels. As a result, the frequency spectrum is broadened with the increase of the input power.

关键词： of on with is Spectral Broadening of Ion Bernstein Wave Due to Parametric Decay Instabilities ICRF in