2016 IEEE International Conference on Plasma Science (ICOPS)最新文献_第4页

Investigation on the characteristics of dielectric barrier discharge in methane with parallel-plate and multi needle-plate electrode in low pressure 低压条件下平行板和多针板电极甲烷介质阻挡放电特性的研究

2016 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2016-08-08 DOI: 10.1109/PLASMA.2016.7534146

P. Li, H. Mu, C. Y. Yu, C. Yao, G. Xu, S. Chen, G. J. Zhang

{"title":"Investigation on the characteristics of dielectric barrier discharge in methane with parallel-plate and multi needle-plate electrode in low pressure","authors":"P. Li, H. Mu, C. Y. Yu, C. Yao, G. Xu, S. Chen, G. J. Zhang","doi":"10.1109/PLASMA.2016.7534146","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534146","url":null,"abstract":"Summary form only given. Non-equilibrium plasma-assisted combustion has been extensively studied over the last few decades and has shown promising effects on combustion controlling, such as reducing ignition delay time, increasing flame propagation speed, enhancing flame stabilization and so on. In this paper, we investigated on the characteristics of dielectric barrier discharge (DBD) in methane with parallel-plate and multi-needle-to-plate electrodes under low pressure with sinusoidal waveform (20 kHz, 0-30 kV) power supply. A mechelle spectrometer (Mechelle 5000, Andor) is used to capture the plasma spectra. The results show that the discharge produces abundant active components related to combustion, such as CH (λ=392.5, 430.1, 438.7, 440.9nm), and C2 (A=473.6nm) in the excited level. Temperature of the active particles is calculated by LIFBASE software and platinum-rhodium thermocouple. With the increasing of applied voltage, the gas temperature and the number and average energy of the high-energy electrons are increased, leading to more free particles which are in the excited state, and finally the corresponding emission spectrum intensity is enhanced. Under the same gas pressure and electrode gap except for generation by different the electrode structure, the temperature of gas in multi needle-plate electrode is lower than plate-plate electrode. And it is proven that multi needles in a honeycomb structure layout can be made in more stable discharge, which can be used in sub-atmospheric even under atmospheric pressure, and it is better for plasma-assisted combustion application.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114559108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

3-D porous hierarachical nanostructured materials by low temperature green plasma chemistry and plasma-surface interactions for applications in energy storage 基于低温绿色等离子体化学和等离子体表面相互作用的三维多孔纳米结构材料在能量存储中的应用

2016 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2016-08-08 DOI: 10.1109/PLASMA.2016.7534060

B. Ouyang, R. Rawat

{"title":"3-D porous hierarachical nanostructured materials by low temperature green plasma chemistry and plasma-surface interactions for applications in energy storage","authors":"B. Ouyang, R. Rawat","doi":"10.1109/PLASMA.2016.7534060","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534060","url":null,"abstract":"Summary form only given. In this paper we present the review of various research works that our group has done to develop a simple and environmentally-friendly approach for (i) green plasma chemistry based synthesis of free standing 3-D carbon nanostructures, particularly graphene nanomesh and vertical graphene, using low flash point sustainable essential oils that vaporize easily and can be easily admitted into plasma chamber just like any gaseous precursor, and (ii) nano-structurization as well functionalization of prefabricated commercial material surfaces by low temperature plasma-surface interactions to prepare 3-D porous hierarchical materials. In first set of experiments, the 3-D vertical graphene (synthesized using indigenously designed RF plasma enhanced chemical vapor deposition/processing facility) were then anchored by suitable energy storage active material such as nanosheets of MnO2 and MoS2 to prepare MnO2@3DVG and MoS2@3DVG electrode for supercapacitor and lithiumion battery assembly. Dense packed vertical graphene based 3D nanostructures were found to exhibit enhanced performance for energy storage applications due to their unique hierarchical structure and reactive edges. In second set of experiments, plasma-surface interaction was used as the tool to process the commercial carbon fibers and nickel foam to create nitrogen functionalized 3-D porous hierarchical nanostructured networks. Few fold improvement in Li-ion storage and excellent overall electrochemical performance was exhibited by nitrogen functionalized 3-D porous nanoarchitectured surface making this method an attractive pathways for development of next generation energy storage devices.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117212345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Plasma electron spectroscopy in microhollow discharge with integrated wallprobe 集成壁探针微空心放电中的等离子体电子能谱

2016 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2016-08-08 DOI: 10.1109/PLASMA.2016.7534243

S. Adams, J. Miles, V. Demidov, B. Tolson, A. Hensley

{"title":"Plasma electron spectroscopy in microhollow discharge with integrated wallprobe","authors":"S. Adams, J. Miles, V. Demidov, B. Tolson, A. Hensley","doi":"10.1109/PLASMA.2016.7534243","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534243","url":null,"abstract":"Summary form only given. The plasma characteristics of a novel microhollow electrode discharge with an integrated wall probe have been analyzed in noble gases. The microplasma device was fabricated with three layers of thin molybdenum metal sheets separated by two thin sheets of mica insulation. A 200 micrometer diameter hole formed a microhollow electrode cylindrical cavity that passed through the entire five layers. The outer layers of molybdenum acted as a hollow anode and hollow cathode, while the inner molybdenum layer formed an effective wall probe. The working gas could be introduced as a flow through the microcavity into open air or the entire microplasma device could be operated in a closed vacuum chamber with a selected gas composition and pressure. Under certain microdischarge conditions, wall probe I-V measurements showed peaks in the electron energy spectra revealing an excess of fast electrons at specific energies. Analysis of these preliminary experiments using plasma electron spectroscopy (PLES) techniques produced promising results, revealing evidence in the spectra of energy exchange with specific neutral and excited gas species. This demonstrates, for the first time, that a wall probe can be useful for interpretation of plasma properties and the plasma-boundary interaction in a microplasma with a nonlocal electron energy distribution at atmospheric pressure. The condition of nonlocality has been analyzed in relation to the dimension of this microhollow electrode discharge and the operating conditions. In noble gases with elastic collisions of electrons, the condition of nonlocality is typically met when p L <;10 Torr-cm, where p is the gas pressure and L is a characteristic plasma dimension. Further development of wall probes in microplasmas would enable a thorough understanding of non-Maxwellian electron energy distributions as well as the possible use of a device as an analytical sensor employing PLES analysis.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122031376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Lattice stability in ultrafast laser excited gold 超快激光激发金的晶格稳定性

2016 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2016-08-08 DOI: 10.1109/PLASMA.2016.7534276

Z. Chen, Y. Tsui, V. Recoules, M. Mo, P. Hering, S. Glenzer, A. Ng

{"title":"Lattice stability in ultrafast laser excited gold","authors":"Z. Chen, Y. Tsui, V. Recoules, M. Mo, P. Hering, S. Glenzer, A. Ng","doi":"10.1109/PLASMA.2016.7534276","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534276","url":null,"abstract":"Summary form only given. Central to the calculation of structural, dynamical and thermal properties of matter is the interatomic potential that is little known particularly for non-simple metals under extreme conditions. A direct manifestation of interatomic potential is lattice stability that can readily be determined by observing the disassembly of an excited sample. Here we report the study of fs-laser excited Au. In our experiment, 30nm-thick freestanding gold foils are irradiated by 400nm, 45fs (FWHM) laser pulses to produce isochoric heated warm dense states with excitation energy densities ranging from ~0.5-7.5MJ/kg (1010-1.5×1011J/m3). The disassembly of the sample is monitored with Frequency Domain Interferometry (FDI) using an 800nm, chirped laser probe pulse. The first finding is the dependence of disassembly time on excitation energy density. This provides the first test of predictions obtained from MD simulations1 using a glue model interatomic potential2. An equally significant finding is the appearance of surface melting that precedes bulk melting at energy densities above 3MJ/kg. Interestingly, the melting of two uppermost surface layers in Au has also been predicted in the glue model simulations2. The melting occurs at ~100K below the bulk melting temperature and remains confined to the two layers. It should be noted that our results are not only of fundamental importance for understanding and modeling the properties of warm dense matter, but also key to the understanding of high intensity laser ablation of solids.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125098078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Electron extraction from an expanding laser induced plasma cathode 膨胀激光诱导等离子体阴极的电子提取

2016 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2016-08-08 DOI: 10.1109/PLASMA.2016.7534054

F. Gobet, X. Raymond, M. Versteegen, F. Hannachi, M. Tarisien

{"title":"Electron extraction from an expanding laser induced plasma cathode","authors":"F. Gobet, X. Raymond, M. Versteegen, F. Hannachi, M. Tarisien","doi":"10.1109/PLASMA.2016.7534054","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534054","url":null,"abstract":"Summary form only given. The development of a bright and pulsed source of low energy (multi-keV) electrons is essential to measure cross sections of nuclear excitation by inelastic electron scattering which are expected to occur in hot and dense plasmas1-4. Due to the small values of the calculated cross sections of this excitation process (10-33/10-30 cm2), bunches of electrons with up to 1013-1014 particles in a few tens of ns are necessary with energies ranging from 10 keV to 100 keV. We are developing an original electron source based on the capacity of laser heated plasmas to produce large numbers of free electrons at low energies (a few eVs). These electrons could be extracted and post-accelerated by traditional electrostatic optics. First studies have been performed to characterize the dynamics of the expanding plasma produced with a ns laser pulse at 1013 W.cm-2 in which 1015 free electrons are produced5. Using electrostatic devices, electron bunches have been extracted from the expanding plasma in an energy range of a few keV. Several characteristics of these electrons have been measured and confronted with PIC simulations in order to better understand the dynamics of the extraction, and to identify key parameters to optimize the number of extracted electrons.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129497419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Measurements of magnetic and electric fields in high energy electron beam diodes 高能电子束二极管磁场和电场的测量

2016 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2016-08-08 DOI: 10.1109/PLASMA.2016.7534094

M. Johnston, Sonal G. Patel, M. Kiefer, S. Biswas, R. Doron, V. Bernshtam, E. Stambulchik, Y. Maron

{"title":"Measurements of magnetic and electric fields in high energy electron beam diodes","authors":"M. Johnston, Sonal G. Patel, M. Kiefer, S. Biswas, R. Doron, V. Bernshtam, E. Stambulchik, Y. Maron","doi":"10.1109/PLASMA.2016.7534094","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534094","url":null,"abstract":"Summary form only given. The RITS accelerator (5-11MV, 100-200kA) at Sandia National Laboratories is being used to evaluate the Self-Magnetic Pinch (SMP) diode as a potential flash x-ray radiography source. This diode consists of a small, hollowed metal cathode and a planar, high atomic mass anode, with a small vacuum gap of approximately one centimeter. The electron beam is focused, due to its self-field, to a few millimeters at the target, generating bremsstrahlung x-rays. During this process, plasmas form on the electrode surfaces and propagate into the vacuum gap, with a velocity of a 1-10 cm's/microseconds. These plasmas are measured spectroscopically using a Czerny-Turner spectrometer with a gated, ICCD detector, and input optical fiber array. Local magnetic and electric fields of several Tesla and several MV/cm were measured through Zeeman splitting and Stark shifting of spectral lines. Specific transitions, the shape of which is susceptible to magnetic and electric field effects, were utilized through the application of dopants. Data was analyzed using detailed, time-dependent, collisional-radiative (CR) and line-shape calculations. In addition to spectral line analyses, determinations of plasma properties were obtained from continua and line spectra as well. Recent results are presented.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122215310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Construction, characterization and optimization of a plasma window based on a cascade arc design for FAIR at the GSI Hemholtz Center GSI Hemholtz中心基于级联弧设计的FAIR等离子体窗口的构建、表征和优化

2016 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2016-08-08 DOI: 10.1109/PLASMA.2016.7534118

B. Bohlender, J. Wiechula, M. Iberler, O. Kester, J. Jacoby

引用次数: 0

Fourier series analysis and synthesis of type-E PFNs for time-varying loads 时变载荷下e型pfn的傅立叶级数分析与综合

2016 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2016-08-08 DOI: 10.1109/PLASMA.2016.7534140

C. Rose

引用次数: 0

Numerical thermalization in one- and two-dimensional particle-in-cell simulations with Monte-Carlo collisions 蒙特卡罗碰撞下一维和二维粒子胞内模拟的数值热化

2016 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2016-08-08 DOI: 10.1109/PLASMA.2016.7534193

P. Lai, Y. Lin-Liu, L. Chen, S. Chen

{"title":"Numerical thermalization in one- and two-dimensional particle-in-cell simulations with Monte-Carlo collisions","authors":"P. Lai, Y. Lin-Liu, L. Chen, S. Chen","doi":"10.1109/PLASMA.2016.7534193","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534193","url":null,"abstract":"Summary form only given. Numerical thermalization induced by discrete-particle effects was observed in particle-in-cell (PIC) simulations1, which show that the thermal relaxation time scales with ND2 and ND for one-dimensional (1D) and two-dimensional (2D) models2, respectively. The parameter ND denotes the number of particles in a Debye length (1D) or a Debye square (2D). However, it was found recently that the thermal relaxation time is anomalously shortened to scale with ND while adding the Monte-Carlo collisions in a 1D PIC simulation.3,4 In this work, we examine the numerical thermalization in two-dimensional ES PIC simulations with the consideration of electron-ion collision and electron-neutral collision.4 Our results show that the thermal relaxation time is less sensitive to the collision frequency as compared to the 1D cases, and the thermal relaxation time remains to scale with ND as predicted by the theoretical analysis using the Balescu-Lenard-Landau kinetic theory5.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115907045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on transmission characteristic of terahertz waves in homogeneous plasma generated by DC glow discharge 直流辉光放电产生的均匀等离子体中太赫兹波的传输特性研究

2016 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2016-08-08 DOI: 10.1109/PLASMA.2016.7534203

W. Shi, Suguo Chen, L. Hou, Hong Liu, Ming Xu, Cheng Ma

{"title":"Research on transmission characteristic of terahertz waves in homogeneous plasma generated by DC glow discharge","authors":"W. Shi, Suguo Chen, L. Hou, Hong Liu, Ming Xu, Cheng Ma","doi":"10.1109/PLASMA.2016.7534203","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534203","url":null,"abstract":"Summary form only given. The plasma is produced when the spacecraft enter our atmosphere with the temperature rise sharply because of friction. As the aircraft carrier of communication, microwave has lower inherent frequency than the plasma that led to interruptions of communications. This is the blackout which is a problem urgently to be solved in the aerospace field. Improving the carrier frequency by using broadband terahertz wave as a carrier is an effective way to solve the blackout. The plasma concentration range from 1016 m-3 to 1020 m-3 in the blackout region.In this paper, the homogeneous plasma was generated by DC glow discharge plasma, and its characteristic parameters were diagnosed by Langmuir probe method and calculated by discharge current theory. The results show that the plasma concentration of homogeneous plasma is ranging from 1016 m-3 to 1019 m-3. The plasma was put at the focus of THz waves in a THz-TDS system, and the THz time domain waveforms before and after the plasma were obtained in the system, and the attenuation of THz wave in the plasma was calculated according to the change of THz amplitudes. The reflectivity, transmissivity and attenuation of terahertz waves in the homogeneous plasma with the same concentration were simulated by Scattering Matrix Method. Both the simulation results and experiment results show that terahertz waves with the frequency of 0.13 THz can freely transmit in the DC glow discharged homogeneous plasma.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"143 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114358043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0