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plasma Science and Technology 2013年第5期15卷 448-454页

作者： Constantine L. XAPLANTERIS Eleni D. FILIPPAKI plasma physics lab IMS NCSR "Demokritos" Hellenic Military Academy

During the last decades many researchers have been occupied with other plasma applications apart from the big challenge which the thermonuclear fusion poses. Many experiments have been carried out on the plasma behavior in contact with a solid surface; when the surface material consists of chemical compounds （e.g. oxides of metals）, then the plasma chemistry takes place. The present paper contains the final experimental and theoretical work of plasma laboratory at ＂Demokritos＂, which consists of an elaboration of plasma sheath parameters adapted to experimental conditions, a suitable choice of plasma gases （either H 2 or N 2 ）, and an electric po-tential current enforcement on objects. Additionally, a brief theory is given to explain the results, with a short reference to both boundary phenomena in thermonuclear reactors and low pressure plasma of glow discharges, so as to reveal the similarities and differences of these two cases. An extensive examination of the treated objects by X-ray diffraction method （XRD） gives results in agreement with the theoretical predictions. Using this improvement on plasma restoration system, （a combination of electric current on metallic object into suitable plasma）, it is shown that better results can be achieved on the cleaning and conservation of archaeological objects.

关键词： impurities plasma sheath parameters reduction of surfaces external poten-tial treatment rate

On-Line Measurement of Ion Density in Atmospheric Nitrogen Discharge Filaments via Radiation Signals from plasma Oscillation

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plasma Science and Technology 2014年第5期16卷 448-453页

作者：汝丽丽孟月东黄建军齐冰 Applied plasma Division Institute of Plasma PhysicsChinese Academy of Sciences SZU-IPPCAS Joint lab.for Applied plasma Shenzhen University

Diagnosis of the particle number density of plasma plays an important role in the understanding of plasma sources and *** radiation signals from plasma oscillation in filaments of atmospheric nitrogen discharge,which were excited by the injection of secondary electron beams during the propagation of the streamer,are employed to determine the ion density of plasma and its evolution in the *** show that the density of N4＋ in a filament of atmospheric nitrogen discharge is of the order of 1013 *** is also found that the recombination processes play a dominant role in plasma decay,and that the ion density decreases non-monotonically with time during streamer propagation.

关键词： streamer discharge plasma oscillation radiation signal ion density recombination

Predictive Calculation of Neutral Beam Heating plasmas in EAST Tokamak by NUBEAM Code for Certain Parameter Ranges

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plasma Science and Technology 2010年第6期12卷 661-667页

作者：倪琼琳樊铁栓张兴张澄任启龙胡纯栋 StateKey lab of Nuclear physics & Technology School of PhysicsPeking University Institute of plasma physics Chinese Academy of Science

A predictive calculation is carried out for neutral beam heating of fusion plasmas in EAST by using NUBEAM code under certain plasma conditions. Results calculated are analyzed for different plasma parameters. Relations between major plasma parameters, such as density and temperature, are obtained and key physical processes in the neutral beam heating, including beam power deposition, trapped fraction, heating efficiency, and power loss, are simulated. Other physical processes, such as current-drive, toroidal rotation and neutron emission, are also discussed.

关键词： neutral beam heating NUBEAM EAST

Electrical Conductivity in a Non-Maxwellian plasma with Adjustable High-Energy-Tail Distribution

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plasma Science and Technology 2009年第1期11卷 7-13页

作者：项江李定仇志勇 CAS Key lab of Basic plasma physics School of SciencesUniversity of Science and Technology of China

In this paper, a solution to the Fokker-Planck equation is presented, which is extended to the field particles＇ high-energy-tail non-Maxwellian velocity distribution function in transport theory. Based on the correct physical concept of collision intensity, introduced by CHANG and LI, the electrical conductivities for like-particles collisions are obtained in different conditions. The modified Fokker-Planck coefficients for non-Maxwellian scattering are applied in the study. It is found that the parallel part of the collision operator plays an important role. The non-Maxwellian scattering will stimulate the transport processes in various degrees with mutative deviation parameters.

关键词： Fokker-Planck coefficients non-Maxwellian velocity distributio field particles velocity distribution electrical conductivity

Study of the Performance of a Streaked Optical Pyrometer System for Temperature Measurement of Shocked Materials

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plasma Science and Technology 2014年第6期16卷 571-576页

作者：张琛刘浩王哲斌蒋小华张惠鸽刘永刚李志超李三伟杨冬丁永坤赵斌胡广月郑坚 CAS Key lab of Basic plasma physics Department of Modern PhysicsUniversity of Science and Technology of China Laser Fusion Research Center China Academy of Engineering Physics

A streaked optical pyrometer （SOP） is developed and calibrated for the measurement of the temperature of shocked materials. In order to achieve a higher relative sensitivity, a onechannel scheme is adopted for the system. The system is calibrated with a shocked step-shaped aluminum sample in the SG-III prototype laser facility. The relation between the count number in the detection system and the sample temperature is thus obtained, which can be adopted to infer the temperature of any shocked materials in future experiments.

关键词： streaked optical pyrometer relative sensitivity temperature

High power impulse magnetron sputtering and its applications

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plasma Science and Technology 2018年第6期20卷 52-68页

作者： Yan YUAN Lizhen YANG Zhongwei LIU Qiang CHEN lab of plasma physics and Materials Beijing Institute of Graphic CommunicationBeijing 102600People＇s Republic of China

High power impulse magnetron sputtering（HiPIMS） has attracted a great deal of attention because the sputtered material is highly ionized during the coating process,which has been demonstrated to be advantageous for better quality ***,the mechanism of the HiPIMS technique has recently been *** this paper,the current knowledge of HiPIMS is *** focus on the mechanical properties of the deposited thin film in the latest applications,including hard coatings,adhesion enhancement,tribological performance,and corrosion protection layers.A description of the electrical,optical,photocatalytic,and functional coating applications are *** prospects for HiPIMS are also discussed in this work.

关键词： HiPIMS basic knowledge applications review

MHD Flow Layer Formation at Boundaries of Magnetic Islands in Tokamak plasmas

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plasma Science and Technology 2006年第1期8卷 101-104页

作者：董家齐龙永兴牟宗泽张锦华 Southwestern Institute of physics Chengdu 610041Chinaand SWIP-DUT Joint Lab.for Fusion Plasma PhysicsChengdu 610041China

Non-linear development of double tearing modes induced by electron viscosity is numerically simulated. MHD flow layers are demonstrated to merge in the development of the modes. The sheared flows are shown to lie just at the boundaries of the magnetic islands, and to have suffcient levels required for internal transport barrier （ITB） formation. Possible correlation between the layer formation and triggering of experimentally observed ITBs, preferentially formed in proximities of rational flux surfaces of low safety factors, is discussed.

关键词： double tearing mode electron viscosity flow layer transport barrier

The First Benchmarking of ITER BR Nb_3Sn Strand of CNDA

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plasma Science and Technology 2012年第9期14卷 847-849页

作者：龙风刘方武玉倪志鹏 Institute of plasma physics Chinese Academy of Sciences

According to the International Thermonuclear Experimental Reactor （ITER） Pro- curement Arrangement （PA） of Cable-In-Conduit Conductor （CICC） unit lengths for the Toroidal Field （TF） and Poloidal Field （PF） magnet systems of ITER, at the start of process qualification, the Domestic Agency （DA） shall be required to conduct a benchmarking of the room and low tem- perature acceptance tests carried out at the Strand Suppliers and/or at its Reference laboratories designated by the ITER Organization （IO）. The first benchmarking was carried out successfully in 2009. Nineteen participants from six DAs （China, European Union, Japan, South Korea, Russia, and the United States） participated in the first benchmarking. Bronze-route （BR） Nb3Sn strand and samples prepared by the ITER reference lab （CERN） were sent out to each participant by CERN. In this paper, the test facility and test results of the first benchmarking by the Chinese DA （CNDA） are presented.

关键词： benchmarking BR NbaSn CNDA

The Modified Friction and Diffusion Coefficients of Fokker-Planck Equation and Relaxation Rates for Non-Maxwellian Scattering

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plasma Science and Technology 2008年第6期10卷 661-670页

作者：项江李定蔡辉山 CAS Key lab of Basic plasma physics School of SciencesUniversity of Science and Technology of ChinaHefei 230026China

In this paper, a new method to derive the Fokker-Planck coefficients defined by a non-Maxwellian velocity distribution function for the field particles is presented. The three- fold integral and the new Debye cutoff parameter, which were introduced by CHANG and LI, are applied. Therefore, divergence difficulties and the customary replacement of relative velocity g by thermal velocity vth are naturally avoided. The probability function P（v, Av） for non- Maxwellian scattering is derived by the method of choosing velocity transfer Av, which is a true measure of collision intensity, as an independent variable. The method enables the difference between small-angle scattering and small-momentum-transfer collisions of the inverse-square force to be well clarified. With the help of the probability function, the Fokker-Planck coefficients are obtained by a normal original Fokker-Planck approach. The friction and diffusion coefficients of the Fokker-Planck equation are modified for non-Maxwellian scattering and are used to investigate the relaxation processes for the weakly coupled plasma. The profiles of the relaxation rates show that the slowing down and deflection processes are weakened in the conditions of non-Maxwellian scattering.

关键词： Fokker-Planck coefficients non-Maxwellian velocity distribution field particles velocity distribution small-angle scattering small-momentum-transfer collisions

Nitrogen Deposition Via N^+ Implantation:Implications for Primordial Amino Acids Synthesis Revisited

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plasma Science and Technology 2007年第2期9卷 252-256页

作者：王伟石怀彬王相勤余增亮 Key lab of Ion Beam Bioengineering Institute of Plasma PhysicsChinese Academy of SciencesHefei 230031China

In this paper amino acids synthesis in aqueous solution induced by ion implantation, which was possibly ubiquitous on primitive Earth, is investigated. As a discharge using a graphite rod as the anode under a nitrogen atmosphere was performed against ammonia water, it was found that three kinds of amino acids were produced. They were glycine, serine and alanine. By introducing ion implantation into the carboxylate solution, ammonia and amino acids were also formed via nitrogen deposition/fixation. Another isotopic experiment showed that both OH and H radicals played a crucial role in the arc-discharge-promoted reactions in aqueous solution Therefore, we believe that the impact of ions in the original atmospheric conditions might have functioned as a promoter in the chemical origin and evolution of life.

关键词： amino acids ion implantation nitrogen deposition