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< Page ,Total 31 >
2D particle-in-cell simulation of the entire process of surface flashover on insulator in vacuum EI SCIE Scopus
期刊论文 | 2018 , 25 (4) | PHYSICS OF PLASMAS
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Abstract :

With the introduction of an external circuit model and a gas desorption model, the surface flashover on the plane insulator-vacuum interface perpendicular to parallel electrodes is simulated by a Particle-In-Cell method. It can be seen from simulations that when the secondary electron emission avalanche (SEEA) occurs, the current sharply increases because of the influence of the insulator surface charge on the cathode field emission. With the introduction of the gas desorption model, the current keeps on increasing after SEEA, and then the feedback of the external circuit causes the voltage between the two electrodes to decrease. The cathode emission current decreases, while the anode current keeps growing. With the definition that flashover occurs when the diode voltage drops by more than 20%, we obtained the simulated flashover voltage which agrees with the experimental value with the use of the field enhancement factor beta = 145 and the gas molecule desorption coefficient gamma = 0.25. From the simulation results, we can also see that the time delay of flashover decreases exponentially with voltage. In addition, from the gas desorption model, the gas density on the insulator surface is found to be proportional to the square of the gas desorption rate and linear with time. Published by AIP Publishing.

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GB/T 7714 Wang, Hongguang , Zhang, Jianwei , Li, Yongdong et al. 2D particle-in-cell simulation of the entire process of surface flashover on insulator in vacuum [J]. | PHYSICS OF PLASMAS , 2018 , 25 (4) .
MLA Wang, Hongguang et al. "2D particle-in-cell simulation of the entire process of surface flashover on insulator in vacuum" . | PHYSICS OF PLASMAS 25 . 4 (2018) .
APA Wang, Hongguang , Zhang, Jianwei , Li, Yongdong , Lin, Shu , Zhong, Pengfeng , Liu, Chunliang . 2D particle-in-cell simulation of the entire process of surface flashover on insulator in vacuum . | PHYSICS OF PLASMAS , 2018 , 25 (4) .
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A Circuit Particle-in-Cell Coupled Simulation of a Magnetically Insulated Transmission Line System EI SCIE Scopus
期刊论文 | 2017 , 45 (7) , 1762-1768 | IEEE TRANSACTIONS ON PLASMA SCIENCE | IF: 1.253
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Abstract :

We have developed a circuit particle-in-cell (PIC) coupled model for simulating a pulsed power system, based on a circuit algorithm of a pulsed power supply and a PIC simulation for a magnetically insulated transmission line (MITL) system. The coupled algorithm comprises an external circuit algorithm based on BERTHA and a coupled algorithm for the PIC and circuit interface based on the Mur absorbing boundary condition. In this paper, a simple coaxial MITL with a single linear transformer driver (LTD) was simulated to validate the coupled model compared with PSPICE and BERTHA simulations. The numerical results show that the circuit-PIC coupled model achieved almost the same outputs on the load. The coupled model was then applied to an MITL system driven by ten LTD cavities. The simulation results and experimental results were in agreement, which confirms that the circuit-PIC coupled model could provide a reference for the structural design of experimental apparatuses.

Keyword :

particle-in-cell (PIC) magnetically insulation BERTHA pulsed power systems coupled algorithm

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GB/T 7714 Wang, Hongguang , Peng, Min , Luo, Wei et al. A Circuit Particle-in-Cell Coupled Simulation of a Magnetically Insulated Transmission Line System [J]. | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2017 , 45 (7) : 1762-1768 .
MLA Wang, Hongguang et al. "A Circuit Particle-in-Cell Coupled Simulation of a Magnetically Insulated Transmission Line System" . | IEEE TRANSACTIONS ON PLASMA SCIENCE 45 . 7 (2017) : 1762-1768 .
APA Wang, Hongguang , Peng, Min , Luo, Wei , Li, Yong-Dong , Liu, Chun-Liang . A Circuit Particle-in-Cell Coupled Simulation of a Magnetically Insulated Transmission Line System . | IEEE TRANSACTIONS ON PLASMA SCIENCE , 2017 , 45 (7) , 1762-1768 .
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Influence of copper nanowires grown in a dielectric layer on the performance of dielectric barrier discharge EI SCIE Scopus
期刊论文 | 2017 , 35 (1) | JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B | IF: 1.314
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This letter describes the fabrication of copper nanowires within a nanoporous anodic alumina oxide (AAO) layer by electrodeposition through an AAO template. The diameter of nanowires less than 100 nm is generally about 50 nm, which corresponds to the diameter of the nanopores, and can be controlled by the anodic oxidation voltage. Using the AAO with nanowires as the dielectric layer of the dielectric barrier discharge device enables a typical reduction in the breakdown and extinction voltage by about 12%-18%, and 22% at most, in the Neon pressure range of 10-90 kPa. The gas discharge intensity is also enhanced. The field emission property of the integrated nanowires is measured in a vacuum environment, and the resulting emission current density of 0.1 mu A/cm(2) at an electric field of 5.5 V/mu m is three times larger than that of a device without nanowires. This indicates that the reduction in operating voltage is mainly due to additional electrons produced by the nanowires. Additionally, the resulting Fowler-Nordheim characteristic clearly demonstrates the field emission behavior of the copper nanowires. (C) 2016 American Vacuum Society.

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GB/T 7714 He, Zhao , Liang, Zhihu , Zhang, Xiaoning et al. Influence of copper nanowires grown in a dielectric layer on the performance of dielectric barrier discharge [J]. | JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B , 2017 , 35 (1) .
MLA He, Zhao et al. "Influence of copper nanowires grown in a dielectric layer on the performance of dielectric barrier discharge" . | JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B 35 . 1 (2017) .
APA He, Zhao , Liang, Zhihu , Zhang, Xiaoning , Liu, Chunliang . Influence of copper nanowires grown in a dielectric layer on the performance of dielectric barrier discharge . | JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B , 2017 , 35 (1) .
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Transient characteristics of discharge of polymer sample after electon-beam irradiation EI SCIE Scopus CSCD PKU
期刊论文 | 2017 , 66 (6) | ACTA PHYSICA SINICA | IF: 0.669
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Charging effect of dielectric material due to electron beam irradiation has a significant influence on the microdischarge phenomenon of dielectric microwave component by multipactor. The discharge process caused by internal electron leakage can relieve this undesirable charging effect. In this paper, we study the transient discharge characteristics of a dielectric sample after being irradiated by electron beam through numerical simulation. Both the charging and discharging processes of a dielectric sample are considered with a comprehensive model. The Monte-Carlo method is used to simulate the interaction between primary electrons and material atoms before the irradiation is interrupted, including elastic scattering and inelastic scattering. The elastic scattering is calculated with the Mott scattering model, and the inelastic scattering is simulated with the fast secondary electron model or Penn model according to electron energy. Meanwhile, the transport process of internal charges in the sample during the discharge period is simulated including the charge diffusion under the force of charge density gradient, the drift due to built-in E-field, and the trap caused by material defect. In this work, the discharge process is taken to begin at the very moment of charging reaching saturation, with the internal charges kept almost unchanged. A polymer material widely used in advanced component is considered in this work due to its remarkable charging effects. Distributions of internal charges of the sample during the discharge process are simulated, and influences of sample parameters, including sample thickness, electron mobility and trap density in the discharge process, are analyzed. The results show that internal charges move to the bottom of the sample during the discharging, leading to the surface potential reaching an ultimate state which is determined by trap density of the material. The position corresponding to the maximum internal charge density shifts towards the grounded bottom. Although a sample with a larger electron mobility means a faster discharge process, fewer free electrons in this sample result in less discharge quantity. The time constant of discharge process decreases with the increase of sample electron mobility in the form of similar linearity. Although a sample with a larger thickness can hold more internal charges, the increase of sample thickness may increase the distance of internal charges leak yet. Hence, the quantity of discharge first increases and then decreases with the increase of sample thickness. In addition, a larger trap density of a dielectric sample makes charge leak harder, resulting in a lower discharge quantity. Finally, the proportion of discharge quantity in saturated charge quantity decreases from 1 to 0 exponentially with the increase of sample trap density. As a conclusion, those sample parameters have their corresponding effects on discharge characteristics by means of different physical mechanisms. Sample electron mobility determines the discharge time constant obviously by affecting the electron transport speed. The sample thickness affects the discharge quantity by shifting the charging balance mode, and material defect impedes part of discharge quantity from trapping internal free electrons. This simulation method and results can help to recede the charging effect and estimate the evolution charging and discharging states of dielectric material during and after electron beam irradiation.

Keyword :

discharge transient electon-beam irradiation numerical simualtion dielectric material

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GB/T 7714 Feng Guo-Bao , Cao Meng , Cui Wan-Zhao et al. Transient characteristics of discharge of polymer sample after electon-beam irradiation [J]. | ACTA PHYSICA SINICA , 2017 , 66 (6) .
MLA Feng Guo-Bao et al. "Transient characteristics of discharge of polymer sample after electon-beam irradiation" . | ACTA PHYSICA SINICA 66 . 6 (2017) .
APA Feng Guo-Bao , Cao Meng , Cui Wan-Zhao , Li Jun , Liu Chun-Liang , Wang Fang . Transient characteristics of discharge of polymer sample after electon-beam irradiation . | ACTA PHYSICA SINICA , 2017 , 66 (6) .
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The Gain and Time Characteristics of Microchannel Plates in Various Channel Geometries EI SCIE Scopus
期刊论文 | 2017 , 64 (4) , 1080-1086 | IEEE TRANSACTIONS ON NUCLEAR SCIENCE | IF: 1.44
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Abstract :

Microchannel plates (MCPs) are widely used as electron, ion, and X-ray detectors. The gain factor and time resolution of the MCP are strongly dependent on its operating and geometry parameters (applied voltage, length-to-diameter ratio, bias angle, and electrode penetration depth). Measurements about this dependence are sparse and do not cover the full range of the parameters. In this paper, 3-D single channel models are developed in computer simulation technology studio suit to systematically and comprehensively calculate the MCP gain and time resolution for various operating and geometry parameters. Furman secondaries electron emission model is employed in our simulation. Simulated result of the gain versus bias voltage is validated by the available experimental data. Finally, geometry parameters of L = 373.6 mu m, D = 10 mu m, h(in) = h(out) = 5 mu m, and theta = 12 degrees are proposed to optimize the MCP performances. Simulation results show that the gain, mean transit time, and transit time spread of the optimized MCP are expected to reach 128 012, 128 ps and 19 ps at the applied voltage of 1000 V.

Keyword :

microchannel plate (MCP) Channel geometries time resolution gain

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GB/T 7714 Chen, Lin , Wang, Xingchao , Tian, Jinshou et al. The Gain and Time Characteristics of Microchannel Plates in Various Channel Geometries [J]. | IEEE TRANSACTIONS ON NUCLEAR SCIENCE , 2017 , 64 (4) : 1080-1086 .
MLA Chen, Lin et al. "The Gain and Time Characteristics of Microchannel Plates in Various Channel Geometries" . | IEEE TRANSACTIONS ON NUCLEAR SCIENCE 64 . 4 (2017) : 1080-1086 .
APA Chen, Lin , Wang, Xingchao , Tian, Jinshou , Zhao, Tianchi , Liu, Chunliang , Liu, Hulin et al. The Gain and Time Characteristics of Microchannel Plates in Various Channel Geometries . | IEEE TRANSACTIONS ON NUCLEAR SCIENCE , 2017 , 64 (4) , 1080-1086 .
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Suppressing double-metal-surface resonant multipactor by three dimensional wavy surface EI SCIE Scopus
期刊论文 | 2017 , 24 (4) | PHYSICS OF PLASMAS | IF: 1.941
WoS CC Cited Count: 3
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Here, a method to suppress resonant multipaction in microwave systems is proposed in which the radio frequency system's metal plates are patterned with a three-dimensional periodic ripple profile in which each unit is two orders smaller than the radio frequency wavelength. The multipaction-inhibiting mechanism was studied analytically and with a particle-in-cell simulation. The analytical and three-dimensional electromagnetic simulated field distribution of the rotationally symmetric surface structures shows the evanescent E-field characteristics in the ripple valleys, which increase the electron staid time and the temporal dispersion of the secondary electron generation, as well as causing the electrons to deviate from the resonant phase that causes multipaction. Published by AIP Publishing.

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GB/T 7714 Chang, C. , Li, Y. D. , Verboncoeur, J. et al. Suppressing double-metal-surface resonant multipactor by three dimensional wavy surface [J]. | PHYSICS OF PLASMAS , 2017 , 24 (4) .
MLA Chang, C. et al. "Suppressing double-metal-surface resonant multipactor by three dimensional wavy surface" . | PHYSICS OF PLASMAS 24 . 4 (2017) .
APA Chang, C. , Li, Y. D. , Verboncoeur, J. , Liu, Y. S. , Liu, C. L. . Suppressing double-metal-surface resonant multipactor by three dimensional wavy surface . | PHYSICS OF PLASMAS , 2017 , 24 (4) .
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Nanosecond Discharge at the Interfaces of Flat and Periodic Ripple Surfaces of Dielectric Window with Air at Varied Pressure EI SCIE Scopus
期刊论文 | 2017 , 24 (1) , 375-381 | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION | IF: 1.774
WoS CC Cited Count: 5
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Abstract :

The spatial visible light profiles from plasma discharges near the dielectric-air interfaces of flat and periodic triangular surfaces at varied pressure in air were studied using a high-speed ICCD camera. Intense light emitted in a sub-centimeter thickness layer above the dielectric surface was observed. With increasing pressure, the brightness and thickness of the light first increases to maximum at a pressure of about 100 Torr, and then decreases. The nonlinear variation of brightness with pressure may result from the increasing critical density of plasma with pressure while the averaged electron energy decreases with an increased rate of collision with gas atoms and molecules. At a certain range of pressure, the electron energy is close to the peak of the excitation collision cross section, together with very high electron density, leads to maximum brightness and thickness light emission. Both for the flat surface and periodic surface, the light emission duration continuously becomes shorter with increasing pressure. Compared with the flat surface, the light duration for the periodic surface is shorter, especially for pressure below 0.1 Torr, where the duration dramatically decreases and no pulse-tail erosion of breakdown waveform is found. Consequently, the duration and brightness for the flat surface is higher than those for the periodic surface in most of the pressure regime studied here. Electron energy, density, and light emission brightness are studied in the analytical electron dynamic to understand these phenomena.

Keyword :

High power microwave dielectric window plasma discharge

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GB/T 7714 Chang, C. , Verboncoeur, J. , Wei, F. L. et al. Nanosecond Discharge at the Interfaces of Flat and Periodic Ripple Surfaces of Dielectric Window with Air at Varied Pressure [J]. | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2017 , 24 (1) : 375-381 .
MLA Chang, C. et al. "Nanosecond Discharge at the Interfaces of Flat and Periodic Ripple Surfaces of Dielectric Window with Air at Varied Pressure" . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION 24 . 1 (2017) : 375-381 .
APA Chang, C. , Verboncoeur, J. , Wei, F. L. , Xie, J. L. , Sun, J. , Liu, Y. S. et al. Nanosecond Discharge at the Interfaces of Flat and Periodic Ripple Surfaces of Dielectric Window with Air at Varied Pressure . | IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION , 2017 , 24 (1) , 375-381 .
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Particle-in-cell simulation for frequency up-conversion of microwave pulse in a rapidly created plasma EI SCIE Scopus
期刊论文 | 2017 , 24 (3) | PHYSICS OF PLASMAS | IF: 1.941
WoS CC Cited Count: 1
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Microwave pulse propagation through a rapidly created plasma and frequency up-conversion has been demonstrated by the particle-in-cell (PIC) method. Compared with the finite-difference timedomain method in which the time-varying plasma is simplified as a dielectric medium, the PIC method considering the interaction and motion of charged particles would be much closer to the experimental values. It is found that the source wave amplitude has a stable range to obtain the stable output. If the source wave amplitude is below 10(3) V/m with the plasma density of 4 x 10(19)m(-3), the output is mainly the plasma noise. Moreover, the higher amplitude source wave beyond 10(8) V/m would break the spatial distribution of the plasma so as to have an influence on the conversion efficiency. The stable range of source wave amplitude is affected by the plasma density. The power loss will increase with the increase in the plasma density in the PIC method, and it is more convenient and accurate to discuss the effects of the collision frequency.

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GB/T 7714 Chen, Kun , Liu, Chunliang , Gao, Mingzhu et al. Particle-in-cell simulation for frequency up-conversion of microwave pulse in a rapidly created plasma [J]. | PHYSICS OF PLASMAS , 2017 , 24 (3) .
MLA Chen, Kun et al. "Particle-in-cell simulation for frequency up-conversion of microwave pulse in a rapidly created plasma" . | PHYSICS OF PLASMAS 24 . 3 (2017) .
APA Chen, Kun , Liu, Chunliang , Gao, Mingzhu , Chang, Chao . Particle-in-cell simulation for frequency up-conversion of microwave pulse in a rapidly created plasma . | PHYSICS OF PLASMAS , 2017 , 24 (3) .
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Development and performance test of dynamic simulation system for X-ray pulsar navigation EI SCIE Scopus CSCD PKU
期刊论文 | 2017 , 66 (5) | ACTA PHYSICA SINICA | IF: 0.669
WoS CC Cited Count: 1
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X-ray pulsar navigation is a complete autonomous navigation system, which has broad application prospects. Because of the huge cost of the navigation system, the implementation of ground simulation system is essential to the application of X-ray pulsar navigation. At present, most of researches on the semi physical experiment system are static. The aim of this article is to develop the dynamic simulation experiment system as well as its performance test. Specifically, this system consists of the dynamic signal database, X-ray simulation source, vacuum system and detection system designed for different science purposes. The core component of the X-ray source is the gate controlled X-ray tube, which can simulate the pulse profile of arbitrary waveform. The detecting system is based on the silicon drift detector with high time response capability. It uses trapezoidal shape for signal processing, and the timing resolution of the detection system is better than 2 mu s. In addition, the dynamic signal generation method is given by analyzing the time transformation model while the SINC interpolation method is provided to generate the dynamic pulse profile. Finally, the spacecraft revolving around the earth for a circle and receiving a pulse signal of Crab is simulated. In the simulation, the orbital radius of satellite is 6578 km and the orbital period is 5400 s. The Crab pulsar is selected, and the pulse period is 33.4 ms, the number of photons received by the detector is 200 per second. As a contrast, a set of static experiments is also performed. The correlation coefficient between the cumulative pulse profile and the standard pulse profile is 0.9953. However, the correlation coefficient decreases gradually, from 0.9094 at 300 s to 0.4080 at 5400 s, in the dynamic experiment. Then, the pulse period is searched from the arrival time of photons. The periodicity of the pulse signal is sinusoidal when the search period is 60 s. The change rate of photon flux is less than 2%, and the influence on the period search is negligible. The variation of pulse period is consistent with the motion law of spacecraft, which indicates that spacecraft motion is the dominant factor in time conversion. Finally, the arrival time of photons is transformed into the time at the solar system barycenter, indicating that the correlation coefficient between cumulative pulse profile and standard pulse profile is 0.9882. The result shows that the simulation system can simulate the X-ray pulse signal received by the spacecraft in orbit, which can provide the experimental basis for verifying the navigation algorithm and calibrating the detector performance.

Keyword :

X-ray simulation source dynamic experiment X-ray pulsar-based navigation silicon drift detector

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GB/T 7714 Xu Neng , Sheng Li-Zhi , Zhang Da-Peng et al. Development and performance test of dynamic simulation system for X-ray pulsar navigation [J]. | ACTA PHYSICA SINICA , 2017 , 66 (5) .
MLA Xu Neng et al. "Development and performance test of dynamic simulation system for X-ray pulsar navigation" . | ACTA PHYSICA SINICA 66 . 5 (2017) .
APA Xu Neng , Sheng Li-Zhi , Zhang Da-Peng , Chen Chen , Zhao Bao-Sheng , Zheng Wei et al. Development and performance test of dynamic simulation system for X-ray pulsar navigation . | ACTA PHYSICA SINICA , 2017 , 66 (5) .
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基于修正差分进化算法确定周期内多载波微放电等效功率 CSCD PKU
期刊论文 | 2017 , (2) , 66-72 | 中国空间科学技术
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周期内多载波微放电 等效功率 微波部件 差分进化算法

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GB/T 7714 王新波 , 张小宁 , 李永东 et al. 基于修正差分进化算法确定周期内多载波微放电等效功率 [J]. | 中国空间科学技术 , 2017 , (2) : 66-72 .
MLA 王新波 et al. "基于修正差分进化算法确定周期内多载波微放电等效功率" . | 中国空间科学技术 2 (2017) : 66-72 .
APA 王新波 , 张小宁 , 李永东 , 刘纯亮 , 王瑞 , 魏焕 et al. 基于修正差分进化算法确定周期内多载波微放电等效功率 . | 中国空间科学技术 , 2017 , (2) , 66-72 .
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