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Effect of parallel resonance on the electron energy distribution function in a 60 MHz capacitively coupled plasma 被引量:1
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作者 You HE Yeong-Min LIM +3 位作者 Jun-Ho LEE Ju-Ho KIM Moo-Young LEE Chin-Wook CHUNG 《Plasma Science and Technology》 SCIE EI CAS CSCD 2023年第4期69-78,共10页
In general,as the radio frequency(RF)power increases in a capacitively coupled plasma(CCP),the power transfer efficiency decreases because the resistance of the CCP decreases.In this work,a parallel resonance circuit ... In general,as the radio frequency(RF)power increases in a capacitively coupled plasma(CCP),the power transfer efficiency decreases because the resistance of the CCP decreases.In this work,a parallel resonance circuit is applied to improve the power transfer efficiency at high RF power,and the effect of the parallel resonance on the electron energy distribution function(EEDF)is investigated in a 60 MHz CCP.The CCP consists of a power feed line,the electrodes,and plasma.The reactance of the CCP is positive at 60 MHz and acts like an inductive load.A vacuum variable capacitor(VVC)is connected in parallel with the inductive load,and then the parallel resonance between the VVC and the inductive load can be achieved.As the capacitance of the VVC approaches the parallel resonance condition,the equivalent resistance of the parallel circuit is considerably larger than that without the VVC,and the current flowing through the matching network is greatly reduced.Therefore,the power transfer efficiency of the discharge is improved from 76%,70%,and 68%to 81%,77%,and 76%at RF powers of 100 W,150 W,and 200 W,respectively.At parallel resonance conditions,the electron heating in bulk plasma is enhanced,which cannot be achieved without the VVC even at the higher RF powers.This enhancement of electron heating results in the evolution of the shape of the EEDF from a biMaxwellian distribution to a distribution with the smaller temperature difference between high-energy electrons and low-energy electrons.Due to the parallel resonance effect,the electron density increases by approximately 4%,18%,and 21%at RF powers of 100 W,150 W,and 200 W,respectively. 展开更多
关键词 capacitively coupled plasma parallel resonance electron energy distribution function
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Studies of Electron Energy Distribution Function (EEDF) in Lithium Vapor Excitation at 2S→3D Two-Photon Resonance
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作者 Mohamed A. Mahmoud Kholoud A. Hamam 《Optics and Photonics Journal》 2014年第8期195-212,共18页
We have developed a computational model which quantitatively studies the Electron Energy Distribution Function (EEDF) in laser excited lithium vapor at 2s→3d two-photon resonance. A kinetic model has been constructed... We have developed a computational model which quantitatively studies the Electron Energy Distribution Function (EEDF) in laser excited lithium vapor at 2s→3d two-photon resonance. A kinetic model has been constructed which includes essentially all the important collisional ionization, photoionization, electron collisions and radiative interactions that come into play when lithium vapor (density range 1013?- 1014 cm-3) is subject to a sudden pulse of intense laser radiation (power range 105?- 106 W·cm-2) at wavelength 639.1 nm and pulse duration 20 ns. The applied computer simulation model is based on the numerical solution of the time-dependent Boltzman equation and a set of rate equations that describe the rate of change of the formed excited states populations. Using the measured values for the cross-sections and rate coefficients of each physical process considered in the model available in literature, relations are obtained as a function of the electron energy and included in the computational model. We have also studied the time evolution and the laser power dependences of the ion population (atomic and molecular ions) as well as the electron density which are produced during the interaction. The energy spectra of the electrons emerging from the interaction contains a number of peaks corresponding to the low-energy electrons produced by photoionization and collisional ionization such as assosicative and Penning ionization processes. The non-equilibrium shape of these electrons occurs due to relaxation of fast electrons produced by super-elastic collisions with residual excited lithium atoms. Moreover, a reasonable agreement between McGeoch results and our calculations for the temporal behaviour of the electron density is obtained. 展开更多
关键词 Two-Photon Resonance EXCITATION Laser LITHIUM COLLISIONAL Ionization ENERGY Pooling PHOTOIONIZATION electron ENERGY distribution function
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Analysis of electron energy distribution function in a magnetically filtered complex plasma
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作者 M K Deka H Bailung N C Adhikary 《Chinese Physics B》 SCIE EI CAS CSCD 2013年第4期324-329,共6页
The electron energy distribution function (EEDF) for a magnetically filtered dusty plasma is studied in a dusty double plasma device where the electron energy can be varied from 0.15 eV to ~ 2.8 eV and plasma densi... The electron energy distribution function (EEDF) for a magnetically filtered dusty plasma is studied in a dusty double plasma device where the electron energy can be varied from 0.15 eV to ~ 2.8 eV and plasma density from 10 6 cm-3 to 10 9cm-3 . The characteristics of EEDF for these ranges of plasma parameters are investigated in a pristine plasma as well as in a dusty plasma. The results show that in the presence of dust, there is a drastic modification in EEDF patterns in a plasma with higher electron temperature and density than those in a low temperature and low density plasma produced by the magnetic filter. 展开更多
关键词 dusty plasma magnetic filter electron energy distribution function
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A New Insight into Energy Distribution of Electrons in Fuel-Rod Gap in VVER-1000 Nuclear Reactor
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作者 Fereshteh GOLIAN Ali PAZIRANDEH Saeed MOHAMMADI 《Plasma Science and Technology》 SCIE EI CAS CSCD 2015年第6期441-447,共7页
In order to calculate the electron energy distribution in the fuel rod gap of a VVER- 1000 nuclear reactor, the Fokker-Planck equation (FPE) governing the non-equilibrium behavior of electrons passing through the fu... In order to calculate the electron energy distribution in the fuel rod gap of a VVER- 1000 nuclear reactor, the Fokker-Planck equation (FPE) governing the non-equilibrium behavior of electrons passing through the fuel-rod gap as an absorber has been solved in this paper. Besides, the Monte Carlo Geant4 code was employed to simulate the electron migration in the fuel-rod gap and the energy distribution of electrons was found. As for the results, the accuracy of the FPE was compared to the Geant4 code outcomes and a satisfactory agreement was found. Also, different percentage of the volatile and noble gas fission fragments produced in fission reactions in fuel rod, i.e. Krypton, Xenon, Iodine, Bromine, Rubidium and Cesium were employed so as to investigate their effects on the electrons' energy distribution. The present results show that most of the electrons in the fuel rod's gap were within the thermal energy limitation and the tail of the electron energy distribution was far from a Maxwellian distribution. The interesting outcome was that the electron energy distribution is slightly increased due to the accumulation of fission fragments in the gap. It should be noted that solving the FPE for the energy straggling electrons that are penetrating into the fuel-rod gap in the VVER-1000 nuclear reactor has been carried out for the first time using an analytical approach. 展开更多
关键词 plasma electron energy distribution function Langevin approach based onFokker-Planck equation Geant4 Monte Carlo code
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气压湿度对空气隙绝缘特性的影响研究
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作者 苏梦函 安韵竹 +3 位作者 赵文龙 胡元潮 李海涛 黄涛 《高压电器》 CAS CSCD 北大核心 2024年第1期78-86,共9页
外界环境条件影响以空气为介质的电力设备外绝缘性能,为了研究空气放电的物理特性,文中基于Boltzmann方程研究空气中电子与分子碰撞的微观过程,计算分析气压、湿度对空气隙绝缘性能的影响规律。结果表明,温度为300 K,气压为1.0 atm(1 at... 外界环境条件影响以空气为介质的电力设备外绝缘性能,为了研究空气放电的物理特性,文中基于Boltzmann方程研究空气中电子与分子碰撞的微观过程,计算分析气压、湿度对空气隙绝缘性能的影响规律。结果表明,温度为300 K,气压为1.0 atm(1 atm=101 kPa)时,空气相对湿度的升高会改变电子能量分布函数和电子输运参数。相对湿度每升高30%,电子平均能量下降约0.2 eV,约化电子迁移率下降约0.25×10^(23)(V∙m∙s)^(-1),约化电子扩散系数下降约0.2×10^(24)(m∙s)^(-1),空气相对湿度从0%升高到30%,临界击穿场强升高486 V/cm,空气相对湿度从30%升高到60%,临界击穿场强升高729 V/cm,空气隙绝缘性能增强;温度为300 K,相对湿度为0%时,气压每升高0.2 atm,临界击穿场强升高约6 kV/cm,空气隙绝缘性能增强。 展开更多
关键词 湿度 气压 玻尔兹曼方程 电子能量分布函数 临界击穿场强
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Diagnosing the Fine Structure of Electron Energy Within the ECRIT Ion Source 被引量:3
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作者 金逸舟 杨涓 +2 位作者 汤明杰 罗立涛 冯冰冰 《Plasma Science and Technology》 SCIE EI CAS CSCD 2016年第7期744-750,共7页
The ion source of the electron cyclotron resonance ion thruster (ECRIT) extracts ions from its ECR plasma to generate thrust, and has the property of low gas consumption (2 seem, standard-state cubic centimeter per... The ion source of the electron cyclotron resonance ion thruster (ECRIT) extracts ions from its ECR plasma to generate thrust, and has the property of low gas consumption (2 seem, standard-state cubic centimeter per minute) and high durability. Due to the indispensable effects of the primary electron in gas discharge, it is important to experimentally clarify the electron energy structure within the ion source of the ECRIT through analyzing the electron energy distribution function (EEDF) of the plasma inside the thruster. In this article the Langmuir probe diagnosing method was used to diagnose the EEDF, from which the effective electron temperature, plasma density and the electron energy probability function (EEPF) were deduced. The experimental results show that the magnetic field influences the curves of EEDF and EEPF and make the effective plasma parameter nonuniform. The diagnosed electron temperature and density from sample points increased from 4 eV/2 ×10^16 m-3 to 10 eV/4×10^16 m-3 with increasing distances from both the axis and the screen grid of the ion source. Electron temperature and density peaking near the wall coincided with the discharge process. However, a double Maxwellian electron distribution was unexpectedly observed at the position near the axis of the ion source and about 30 mm from the screen grid. Besides, the double Maxwellian electron distribution was more likely to emerge at high power and a low gas flow rate. These phenomena were believed to relate to the arrangements of the gas inlets and the magnetic field where the double Maxwellian electron distribution exits. The results of this research may enhance the understanding of the plasma generation process in the ion source of this type and help to improve its performance. 展开更多
关键词 ion source plasma diagnostic electron energy distribution function
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Electron-Vibrational Energy Exchange in Nitrogen-Containing Plasma:a Comparison Between an Analytical Approach and a Kinetic Model 被引量:1
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作者 杨薇 董志伟 《Plasma Science and Technology》 SCIE EI CAS CSCD 2016年第1期12-16,共5页
This paper investigates the electron-vibrational(e-V)energy exchange in nitrogencontaining plasma,which is very efficient in the case of gas discharge and high speed flow.Based on Harmonic oscillator approximation a... This paper investigates the electron-vibrational(e-V)energy exchange in nitrogencontaining plasma,which is very efficient in the case of gas discharge and high speed flow.Based on Harmonic oscillator approximation and the assumption of the e-V relaxation through a continuous series of Boltzmann distributions over the vibrational states,an analytic approach is derived from the proposed scaling relation of e-V transition rates.A full kinetic model is then investigated by numerically solving the state-to-state master equation for all vibrational levels.The analytical approach leads to a Landau-Teller(LT)-type equation for relaxation of vibrational energy,and predicts the relaxation time on the right order of magnitude.By comparison with the kinetic model,the LT-type equation is valid in typical electron temperatures in gas discharge.However,the analytical approach is not capable of describing the vibrational distribution function during the e-V process in which a full kinetic model is required. 展开更多
关键词 electron-vibrational process vibrational energy relaxation time vibrational distribution function
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Impact of Initial Electron Development on Sodium Plasma Generation Using LIBORS Technique: Numerical Modeling
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作者 Kholoud A. Hamam Yosr E. E.-D. Gamal 《Journal of Modern Physics》 2018年第4期669-684,共16页
The present work reports an investigation on the role played by Na3+ ions formed through triatomic associative ionization collision of Na(4d) atoms with Na2 ground state molecules during the early phase of sodium plas... The present work reports an investigation on the role played by Na3+ ions formed through triatomic associative ionization collision of Na(4d) atoms with Na2 ground state molecules during the early phase of sodium plasma generation by laser ionization based on resonance saturation (LIBORS). Such ionization mechanism is observed experimentally for the first time by Tapalian and Smith (1993) [1]. In their experiment, stepwise atomic excitations are created using two CW dye lasers;one laser is tuned to 589 nm to excite the Na(3s) to Na(3p) D2 transition of sodium and the other laser is tuned 569 nm to excite the Na(3p) to Na(4d) transition. The analysis is grounded on a numerical study of the role of seed electron processes on the temporal evolution of sodium plasma formation by laser irradiation. A previously developed numerical model based on LIBORS technique is modified and adopted. In the present study, the sodium atom is treated as an atom comprises 22 levels namely: a ground state, 18 excited states and three ionic states (atomic, molecular and tri-atomic). The model tackled various collisional and radiative processes that act to enhance and deplete the free electrons generated in the interaction region. The contribution of these processes is signified by solving numerically a system of time-dependent rate equations, which couple the generated atomic and ionic species with the laser fields. Meanwhile, it solves the time-dependent Boltzmann equation for the electron energy distribution function (EEDF) of the generated electrons. The computed values of the EEDF, time evolution of both excited states population and the formed ionic species considering the individual effect of associative ionization, Penning, and photo-ionization and triatomic associative ionization justified the important effect of each of these ionizing processes in creating the early stage electrons. These seed electrons are assumed to rapidly gain energy through superelastic collisions leading eventually to plasma development. 展开更多
关键词 Plasma Laser COLLISIONAL IONIZATION Association IONIZATION Tri-Atomic Ions PHOTOIONIZATION electron Energy distribution function
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空气放电中电子输运参数的计算与分析 被引量:17
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作者 刘兴华 何为 +2 位作者 杨帆 肖汉光 马俊 《高电压技术》 EI CAS CSCD 北大核心 2011年第7期1614-1619,共6页
为了求解空气放电中电子的各种输运参数,详细介绍了通过Boltzmann方程计算气体放电参数的数值算法。进而分析了约化电场(E/nair)对电子能量分布函数的影响,电子扩散系数、迁移率与约化电场的关系,电离反应系数与电子平均能量的关系。仿... 为了求解空气放电中电子的各种输运参数,详细介绍了通过Boltzmann方程计算气体放电参数的数值算法。进而分析了约化电场(E/nair)对电子能量分布函数的影响,电子扩散系数、迁移率与约化电场的关系,电离反应系数与电子平均能量的关系。仿真结果表明,随着约化电场强度不断增加,电子能量分布函数中最大比例电子数向能量增加的方向移动;电子的扩散系数和迁移率与其他研究者的实验数据基本一致,误差<10%;电子平均能量>2eV时,电离反应系数与Maxwellian分布函数的电离反应系数基本保持一致,证明该计算模型的合理性,为建立可靠的等离子体流体模型奠定良好基础。 展开更多
关键词 BOLTZMANN方程 模型 电子能量分布 电子迁移率 电子扩散系数 电离反应系数
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介质阻挡放电等离子体中的电子碰撞能量转换过程 被引量:6
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作者 丁伟 于向财 唐岩辉 《高压电器》 CAS CSCD 北大核心 2011年第6期43-47,共5页
通过计算建立的介质阻挡放电等离子体动力学模型,分析了等离子体中电子碰撞过程中的电子能量转换过程,为掌握等离子体强化燃烧机理奠定基础。结果表明:介质阻挡放电等离子体中的电子能量分布函数主要受约化场强的影响;随着约化场强的变... 通过计算建立的介质阻挡放电等离子体动力学模型,分析了等离子体中电子碰撞过程中的电子能量转换过程,为掌握等离子体强化燃烧机理奠定基础。结果表明:介质阻挡放电等离子体中的电子能量分布函数主要受约化场强的影响;随着约化场强的变化,电子能量损失于不同碰撞类型的比例不同,且在实验中常用的100~300 Td之间,电子能量主要损失于和N_2、O_2分子间的电子激发态碰撞和离解碰撞过程;对于空气和化学恰当比混合的空气/甲烷混合气介质阻挡放电,在放电结束后约1ms时,分别有约50%和126%的放电能量用于加热气体。 展开更多
关键词 介质阻挡放电 电子能量分布函数 动力学 电子碰撞 放电能量
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碳纳米管场发射机理述评 被引量:3
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作者 张继华 杨传仁 王曦 《材料导报》 EI CAS CSCD 北大核心 2006年第2期13-16,共4页
较全面地介绍了碳纳米管场发射研究10年来在发射机理方面的研究结果,包括场发射能量分布、逸出功、发射模型以及发射稳定性和失效等问题,并介绍了相关方面的研究结果。
关键词 碳纳米管 场电子发射 发射机理 场发射能量分布 逸出功 能量分布 发射模型 场发射 稳定性
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负氢离子源中多峰磁场形态数值模拟 被引量:2
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作者 王小敏 杨超 +1 位作者 刘大刚 王学琼 《强激光与粒子束》 EI CAS CSCD 北大核心 2011年第10期2767-2772,共6页
基于磁荷模型,在有限差分法基础上,推导了3维永磁体数值算法,结合全3维PIC/MCC粒子模拟算法,数值分析比较了外置型和"伞状"型两种特殊形态多峰磁场对电子能量沉积的影响。模拟结果表明:二者都能对粒子起到约束作用且能过滤引... 基于磁荷模型,在有限差分法基础上,推导了3维永磁体数值算法,结合全3维PIC/MCC粒子模拟算法,数值分析比较了外置型和"伞状"型两种特殊形态多峰磁场对电子能量沉积的影响。模拟结果表明:二者都能对粒子起到约束作用且能过滤引出负氢离子,同时二者电子能量分布规律基本一致,都呈现了双电子能态,符合等离子体放电基本机理;外置型过滤磁场对粒子的约束能力更强,能明显产生更多的粒子,总粒子数大约是"伞状"型过滤磁场情况下的4倍;"伞状"型过滤磁场能有效地抑制由磁场不均匀所引起的电子漂移,使产生的负氢离子空间分布更均匀。模拟结果与国外实验结果基本一致。 展开更多
关键词 负氢离子源 多峰磁场 电子能量分布函数 粒子模拟 蒙特卡罗
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高温混合气体临界击穿场强的计算研究 被引量:1
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作者 李世欣 《高压电器》 CAS CSCD 北大核心 2018年第8期91-97,共7页
针对高温混合气体临界击穿场强的计算问题,首先对所采用的零维模型进行了介绍,在此基础之上,对纯空气、空气与PA6蒸气的混合气体、空气与POM蒸气的混合气体在内的不同组分气体介质的临界击穿场强进行了计算,并对计算结果进行了理论上的... 针对高温混合气体临界击穿场强的计算问题,首先对所采用的零维模型进行了介绍,在此基础之上,对纯空气、空气与PA6蒸气的混合气体、空气与POM蒸气的混合气体在内的不同组分气体介质的临界击穿场强进行了计算,并对计算结果进行了理论上的分析。所涉及到的内容主要包括高温体粒子组分的获取,玻尔兹曼方程的近似求解和电子能量分布函数(EEDF)的计算,碰撞截面数据的选择,电子碰撞电离系数和吸附系数的计算。其中重点在于对波尔兹曼输运方程的近似求解和分析不同气体介质对临界击穿场强的影响。 展开更多
关键词 临界击穿场强 零维模型 玻尔兹曼方程 电子能量分布函数
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介质阻挡放电中氧原子的数值模拟
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作者 杜宏亮 何立明 +2 位作者 丁伟 王育虔 兰宇丹 《高压电器》 CAS CSCD 北大核心 2010年第11期38-42,共5页
由于介质阻挡放电具有许多独特的性质,已被广泛地应用于等离子体化学、环境工程及材料表面处理等诸多领域。为了对其进行更好的研究与应用,笔者根据介质阻挡放电中的不同能量传递过程,建立了一个包括电子碰撞激发、离解、电离,吸附和解... 由于介质阻挡放电具有许多独特的性质,已被广泛地应用于等离子体化学、环境工程及材料表面处理等诸多领域。为了对其进行更好的研究与应用,笔者根据介质阻挡放电中的不同能量传递过程,建立了一个包括电子碰撞激发、离解、电离,吸附和解吸,复合以及中性粒子参与的反应等过程的N2-O2介质阻挡放电化学反应动力学模型,并通过求解Boltzmann方程,得到电子能量分布函数,进而通过计算获得了电子—分子碰撞的反应速率系数。代入速率方程,获得了系统中各组分粒子数浓度随时间的变化规律。结果表明:O、O3以及N2和O2分子激发态的粒子数浓度随时间先增加后减小,最后趋于一定值;O原子粒子数浓度受N2激发态分子的影响较大;O原子粒子数浓度随O2体积分数的降低而增加。 展开更多
关键词 介质阻挡放电 化学动力学 能量传递 电子碰撞 电子能量分布函数
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电感耦合等离子体源的研究进展 被引量:1
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作者 杨定宇 蒋孟衡 《微细加工技术》 2007年第4期6-10,共5页
在简要回顾传统高密度等离子体源的基础上,重点介绍了新一代的低温高密度等离子体——电感耦合等离子体源(ICP)的放电机理,并结合最近的研究进展,系统分析了ICP的性能影响因素,总结了ICP目前存在的问题,展望了其应用前景。
关键词 电感耦合等离子体 E型放电 H型放电 静电耦合效应 电子能量分布函数 电感线圈
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电感耦合RF放电等离子体的电流特性
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作者 奚定平 余陨金 陈静秋 《深圳大学学报(理工版)》 EI CAS 2002年第3期1-7,共7页
从等离子体波动方程和动力学方程出发,利用解析方法,讨论电感耦合RF放电等离子体的电流特性和衰减机制.发现只有当等离子体波的波速低到与等离子体内能量较高一部分电子轴向运动速度相当时,等离子体和波相互作用才能在衰减机制中居主导... 从等离子体波动方程和动力学方程出发,利用解析方法,讨论电感耦合RF放电等离子体的电流特性和衰减机制.发现只有当等离子体波的波速低到与等离子体内能量较高一部分电子轴向运动速度相当时,等离子体和波相互作用才能在衰减机制中居主导地位. 展开更多
关键词 电感耦合RF放电等离子体 电流特性 电子速度分布函数 玻尔兹曼方程
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6~50 MHz射频容性耦合Ar等离子体的放电特性
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作者 袁强华 秦彪 +1 位作者 殷桂琴 刘朝晖 《西北师范大学学报(自然科学版)》 CAS 北大核心 2022年第5期34-41,62,共9页
通过光谱实验测量和PIC/MCC模拟,研究了6~50 MHz射频驱动下容性耦合氩等离子体的放电特性.固定气压为40 mTorr,气体流量为30 mL·min-1.结果表明,当频率和气压一定时,随着功率的增大,电子密度升高,电子温度降低;在气压和功率不变的... 通过光谱实验测量和PIC/MCC模拟,研究了6~50 MHz射频驱动下容性耦合氩等离子体的放电特性.固定气压为40 mTorr,气体流量为30 mL·min-1.结果表明,当频率和气压一定时,随着功率的增大,电子密度升高,电子温度降低;在气压和功率不变的情况下,随着频率的增加,电子温度升高,电子密度降低.通过模拟与实验对比发现,模拟结果与实验结果变化趋势较一致.电子能量分布函数均为双麦克斯韦分布,高能电子布居数随功率增大而减小,低能电子布居数随功率增大而增大.当功率恒定为60 W时,高能电子布居数不断增加,而低能电子布居数随频率的增加而减少,这可以解释电子温度随频率的增加而增加的原因.电场强度的时空分布表明,鞘层厚度随功率和频率的增加而减小. 展开更多
关键词 容性耦合放电 PIC/MCC模拟 电子能量分布函数
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SF_6/N_2和SF_6/CF_4混合气体放电参数计算分析 被引量:11
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作者 李璐维 林莘 +1 位作者 徐建源 陈会利 《高压电器》 CAS CSCD 北大核心 2016年第12期60-65,共6页
为研究SF_6混合气体的放电参数特性,文中通过两项近似求解Boltzmann方程得到温度为300 K,不同混合比下SF_6/N_2、SF_6/CF_4的电子能量分布函数(EEDF)、折合电离系数α/N、折合吸附系数η/N和折合有效电离系数(α-η)/N,与其他文献结果对... 为研究SF_6混合气体的放电参数特性,文中通过两项近似求解Boltzmann方程得到温度为300 K,不同混合比下SF_6/N_2、SF_6/CF_4的电子能量分布函数(EEDF)、折合电离系数α/N、折合吸附系数η/N和折合有效电离系数(α-η)/N,与其他文献结果对比,验证了该计算方法与放电参数的有效性。结果表明:SF_6/N_2、SF_6/CF_4两种混合气体都随折合场强E/N增大时,在较低电子能量区域的EEDF减小而在较高电子能量区域的EEDF增大,且SF_6/N_2混合气体在电子能量为3 e V附近存在EEDF的骤降现象,该现象与N_2的碰撞参数截面有关,而SF_6/CF_4混合气体不存在此现象;此外,SF_6/N_2、SF_6/CF_4两种混合气体随着折合场强E/N增大,折合电离系数α/N显著增大、折合吸附系数η/N减小,最终折合有效电离反应系数(α-η)/N也均随之增加。 展开更多
关键词 B0ltzmann方程 电子能量分布函数(eedf) 折合电离系数α/N 折合吸附系数η/N
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大气压纳秒脉冲裸电极放电的粒子模拟研究 被引量:5
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作者 辛璇 刘冰 张远涛 《高电压技术》 EI CAS CSCD 北大核心 2018年第3期944-951,共8页
大气压纳秒脉冲放电由于能量利用率高、可以生成多种活性粒子且容易形成均匀的放电等优势,在等离子体环境、医学等应用方面具有广阔的前景。为此借助于粒子模拟方法,研究了在裸电极条件下,纳秒脉冲放电的演化过程及放电机理。由于电极... 大气压纳秒脉冲放电由于能量利用率高、可以生成多种活性粒子且容易形成均匀的放电等优势,在等离子体环境、医学等应用方面具有广阔的前景。为此借助于粒子模拟方法,研究了在裸电极条件下,纳秒脉冲放电的演化过程及放电机理。由于电极表面没有覆盖介质,在脉冲电压施加过程中,只能观察到一次放电,放电电流一般在电压下降沿开始时刻附近达到最大值。在电压上升沿及坪区阶段,鞘层电场持续增强,鞘层厚度逐渐变薄,电子能量概率分布函数存在明显的高能尾部,电子与离子数密度可以达到很高的数值;放电的熄灭主要是由于脉冲电压的下降造成的,即使在脉冲电压下降阶段,由于前面阶段放电剧烈鞘层电场非常强,碰撞电离依旧可以持续一定的时间。通过粒子模拟研究脉冲电压驱动的裸电极放电,并与相应的介质阻挡放电比较,有助于深化对纳秒脉冲激励的放电演化过程与内在机理的认识。 展开更多
关键词 纳秒脉冲放电 大气压放电 粒子模拟 裸电极放电 鞘层电场 二次电子 电子能量分布函数
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利用气辉测量结果研究高频电波加热电离层实验中电子能量分布 被引量:1
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作者 郝书吉 马广林 +2 位作者 杨巨涛 吕立斌 吴振森 《地球物理学报》 SCIE EI CAS CSCD 北大核心 2017年第3期879-886,共8页
研究了高频电波加热电离层实验期间电子能量分布函数,利用美国HAARP和欧洲EISCAT实验中630.0 nm、557.7 nm与844.6 nm等气辉辐射测量结果,给出了在红光与绿光强度比值小于10和比值大于等于10两种情况下电子能量分布函数表达式,在3~100 e... 研究了高频电波加热电离层实验期间电子能量分布函数,利用美国HAARP和欧洲EISCAT实验中630.0 nm、557.7 nm与844.6 nm等气辉辐射测量结果,给出了在红光与绿光强度比值小于10和比值大于等于10两种情况下电子能量分布函数表达式,在3~100 eV电子能量范围内,分段幂指数因子随电子能量的增加而下降,并利用获得电子能量分布函数对其他电离层加热期间气辉辐射进行计算,红光与绿光辐射强度之比与实验测量结果相符,从而验证了获得的电子能量分布函数. 展开更多
关键词 电离层加热 气辉辐射 电子能量分布函数
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