检索结果-南通市图书馆

plasma transport simulation under different conditions and optimization analysis of dual-stage grid ion thruster

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2023年第7期36卷 388-399页

作者： Yajie HAN Guangqing XIA Bin SUN Chang LU Junjun ZHANG Vladimir A.SAETCHNIKOV State Key Laboratory of Structural Analysis Optimization and CAE Software for Industrial EquipmentDalian University of TechnologyDalian 116024China Key Laboratory of Advanced Technology for Aerospace Vehicles of Liaoning Province Dalian University of TechnologyDalian 116024China Collaborative Innovation Center of Micro&Nano Satellites of Hebei Province North China Institute of Aerospace EngineeringLangfang 065000China Physics and Aerospace Technology Department Belarusian State UniversityMinsk 220030Belarus

In order to study the extraction and acceleration mechanism of the dual-stage grid,a three-dimensional model based on the Particle-In-Cell/Monte Carlo Collision(PIC/MCC)method is ***-stage grid ion thruster is a new type of electrostatic ion thruster,which can break through the limitations of traditional gridded ion thrusters,and greatly improve the specific *** high performance also makes the grid sensitive to operating *** this paper,the influence of grid parameters on xenon ion thruster’s performance in a wide range is systematically simulated,and the optimal operating condition is *** the over-focusing of the plume,and the transparency of the screen grid are improved,and the grid corrosion is reduced through simulation *** specific impulse under the given working conditions is 9877.24 s and the thrust is 7.28 *** on the simulation optimization,the limitation of the dual-stage grid is *** grid performs well under high voltage conditions(>3000 V)but not well under low voltage conditions(plasma distribution and grid extraction ability under xenon and argon are analyzed and compared to study the flexibility of the dual-stage grid ion *** simulation results show that a set of optimal parameters is only applicable to the corresponding propellant,which needs to be optimized for different propellant types.

关键词： 3D modeling Dual-stage grid Ion thruster PIC/MCC method plasma simulation

Monte Carlo simulation of electron beam air plasma characteristics

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2009年第9期18卷 3870-3876页

作者：邓永锋韩先伟谭畅 Shaanxi Power Machine Design and Research Institute State Key Laboratory of Materials Modification By Laser Ion and Electron BeamsDepartment of PhysicsDalian University of Technology

A high-energy electron beam generator is used to generate a plasma in atmosphere. Based on a Monte Carlo toolkit named GEANT4, a model including complete physics processes is established to simulate the passage of the electron beam in air. Based on the model, the characteristics of the electron beam air plasma are calculated. The energy distribution of beam electrons （BEs） indicates that high-energy electrons almost reside in the centre region of the beam, but low-energy electrons always live in the fringe area. The energy deposition is calculated in two cases, i.e., with and without secondary electrons （SEs）. Analysis indicates that the energy deposition of SEs accounts for a large part of the total energy deposition. The results of the energy spectrum show that the electrons in the inlet layer of the low-pressure chamber （LPC） are monoenergetic, but the energy spectrum of the electrons in the outlet layer is not pure. The SEs are largely generated at the outlet of the LPC. Moreover, both the energy distribution of BEs and the magnitude of the density of SEs are closely related to the pressure of LPC. Thus, a conclusion is drawn that a low magnitude of LPC pressure is helpful for reducing the energy loss in the LPC and also useful for greatly increasing the secondary electron density in dense air.

关键词： electron beam discharge plasma simulation Geant4

Numerical simulation of the Self-Heating Effect Induced by Electron Beam plasma in Atmosphere

在线全文

学校读者我要写书评

暂无评论

plasma Science and Technology 2012年第2期14卷 89-93页

作者：邓永锋谭畅韩先伟谭永华 Shaanxi Power Machine Design and Research Institute Academy of Aerospace Propulsion Technology

For exploiting advantages of electron beam air plasma in some unusual applications, a Monte Carlo （MC） model coupled with heat transfer model is established to simulate the characteristics of electron beam air plasma by considering the self-heating effect. Based on the model, the electron beam induced temperature field and the related plasma properties are investigated. The results indicate that a nonuniform temperature field is formed in the electron beam plasma region and the average temperature is of the order of 600 K. Moreover, much larger volume pear-shaped electron beam plasma is produced in hot state rather than in cold state. The beam ranges can, with beam energies of 75 keV and 80 keV, exceed 1.0 m and 1.2 m in air at pressure of 100 torr, respectively. Finally, a well verified formula is obtained for calculating the range of high energy electron beam in atmosphere.

关键词： electron bean: plasma simulation self-heating GEANT4

simulation of plasma properties in magnetron sputtering for two kinds of cathode targets

在线全文

学校读者我要写书评

暂无评论

Radiation Detection Technology and Methods 2020年第1期4卷 10-16页

作者： Di-zhou Guo Shuang-kai Chen Yong-sheng Ma Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Introduction During magnetron sputtering process,the common structure of cathode target is planar target and cylindrical rotating *** this study,cylindrical rotating target is used and two kinds of cathode targets were investigated by COMSOL Multiphysics software(The official network of COMSOL Multiphysics ***://***/).We will elucidate the difference between the two types of cathode target and determine the type of cathode target used in the final *** system configuration We explore the plasma distribution in the radio frequency cavity,so the simulation process was divided into two steps:building RF cavity model and setting up plasma discharge *** main part of the model included the radio frequency cavity substrate(divided into two tube parts and middle ellipsoid part),the cathode and the *** the plasma discharge parameters are as follows:Ar gas was used with 1.5 Pa;magnetic field strength of iron core was set to 1000 Gs;the applied voltage of cathode was set to-160 V;and anode was set to 0 *** For the long cathode target and the short cathode target,the main difference is the electric field *** the electric field lines are denser for the long cathode target,the electric field intensity is stronger,and then the initial energy obtained by electrons is *** the plasma discharge process,because of the high electron energy,the plasma density produced is more than the simulation of the short cathode *** under the same simulation time,the residual energy of electrons is more for the long cathode target,which is the reason for the higher electron *** the previous experimental experience,we know that the film quality formed by higher electron energy is *** simulation in this work shows that the electron energy corresponding to the long cathode target is higher than that of the short cathode target,so we choose the long cathode target as the experimental targ

关键词： Magnetron sputter COMSOL Multiphysics plasma properties plasma simulation Cathode targets

A numerical simulation of the backward Raman amplifying in plasma

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2005年第12期14卷 2560-2564页

作者：王虹宇黄祖洽 Institute of Low Energy Nuclear Physics Beijing Normal University Beijing 100875 China Department of Physics Anshan Normal University Anshan 114005 China

This paper describe a numerical simulation method for the interaction between laser pulses and low density plasmas based on hydrodynamic approximation. We investigate Backward Raman Amplifying （BRA） experiments and ... 详细信息

关键词： plasma simulation laser plasma interactions backward Raman amplifier

1d3v PIC/MCC simulation of dielectric barrier discharge dynamics in hydrogen sulfide

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

plasma Science and Technology 2022年第2期24卷 62-72页

作者： Jing ZHANG Shurong YE Tianxu LIU Anbang SUN State Key Laboratory of Safety and Control for Chemicals SINOPEC Research Institute of Safety Engineering Co.Ltd.Qingdao 266071People's Republic of China State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical EngineeringXi'an Jiaotong UniversityXi'an 710049People's Republic of China

In this study,we computationally examined the dynamics of dielectric barrier discharge in hydrogen *** simulations were performed with a 1 d3 v particle-in-cell/Monte Carlo collision model in which a parallel-plate electrode geometry with dielectrics was *** recombination process is represented in the *** discharge mode was found to be initially Townsend discharge developing from the cathode to the anode,and at the peak of the current,a more stable glow discharge develops from the anode to the cathode.A higher applied voltage results in sufficient secondary electrons to trigger a second current peak,and then the current amplitude *** the frequency is increased,it leads to the advance of the phase and an increase in the amplitude of the current peak.A higher dielectric permittivity also makes the discharge occur earlier and more violently in the gap.

关键词： plasma simulation dielectric barrier discharge PIC simulation

Transport simulation of ECRH H-Mode Experiments on HL-2A Tokamak

在线全文

学校读者我要写书评

暂无评论

plasma Science and Technology 2015年第2期17卷 105-108页

作者：孙爱萍董家齐崔正英 Southwestern Institute of Physics

Transport simulation of ECRH H-mode experiments on HL-2A tokamak is carried out using ONETWO code, the GLF23 and PEDESTAL models, along with TORAY code for ECRH. It is found that the initial electron and ion temperature profiles affect L-H transition significantly, and larger initial temperature gradient at the edge plasma benefits the transition. The simulation results show that it is possible to achieve ECRH H-mode with appropriate initial electron and ion temperature profiles under present discharge conditions on HL-2A tokamak. In addition, the pedestal density, electron temperature and pedestal width are predicted, and the evolutions of electron and ion temperature profile are calculated.

关键词： plasma simulation ECRH H-mode

A Volume-Weight ing Cloud-in-Cell Model for Particle simulation of Axially Symmetric plasmas

在线全文

学校读者我要写书评

暂无评论

plasma Science and Technology 2005年第1期7卷 2653-2656页

作者：李永东何锋刘纯亮 Key Laboratory for Physical Electronics and Devices of the Ministry of Education Xi'an Jiaotong University Xi'an 710049 China

A volume-weighting cloud-in-cell (VW-CIC) model is developed to implement the particle-in-cell (PIC) simulation in axially symmetric systems. This model gives a first-order accuracy in the cylindrical system, and it is incorporated into a PIC code. A planar diode with a finite-radius circular emitter is simulated with the code. The simulation results show that the VW-CIC model has a better accuracy and a lower noise than the conventional area-weighting cloud-in-cell (AW-CIC) model, especially on those points near the axis. The two-dimensional (2-D) space-charge-limited current density obtained from VW-CIC model is in better agreement with Lau’s analytical result. This model is more suitable for 2.5-D PIC simulation of axially symmetric plasmas.

关键词： cloud-in-cell volume-weighting plasma simulation Child-Langmuir law

Numerical simulation of Ultrafast Laser Pulse Propagation in Tenuous plasmas： Envelope Evolving and Modulation

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2006年第3X期46卷 563-567页

作者： WANG Hong-Yu The Key Laboratory of Beam Technology and Materials Modification of Ministry of Education Beijing Normal University Beijing 100875 China Institute of Low Energy Nuclear Physics Beijing Normal University Beijing 100875 China Department of Physics Anshan Normal University Anshan 114005 China

We propose an effective and useful numerical simulation scheme for the investigation of the ultra-fast laser pulses in tenuous plasmas. The accuracy of the method is tested by numerical examples. We check some special examples to investigate the laser envelope evolving and modulation in plasmas. Asymmetric two-peak modulation structure is found and its underlying physics is analyzed. The advantages and shortages of the method are also discussed.

关键词： laser-plasma interactions plasma simulation