2016 IEEE International Conference on Plasma Science (ICOPS)最新文献

{"title":"Laboratory astrophysics with supersonic magnetised plasmas: Experiments on the magpie pulsed-power facility","authors":"G. Burdiak, S. Lebedev, T. Clayson, J. Hare, L. Suttle, F. Suzuki-Vidal","doi":"10.1109/PLASMA.2016.7534004","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534004","url":null,"abstract":"Summary form only given. The use of plasma flows generated by pulsed power facilities provides a natural platform for designing magnetized HEDLA experiments. The plasma in this case is created and accelerated by the JxB force of the driving, ~Mega-Ampere level currents, forming plasma flows with embedded, frozen-in magnetic fields. Here we present several recent experiments performed on the MAGPIE pulsed power facility, focusing on studies of magnetic reconnection in colliding high beta plasmas, the structure of magnetized bow-shocks and the dynamics of magnetized plasma jets. The relatively large spatial and temporal scales characterizing this experimental platform, together with an excellent diagnostic access, allow detailed characterization of the key plasma parameters and quantitative comparison of the experimental results with numerical simulations.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114063670","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}

{"title":"An arbitrary order, fully implicit, hybrid kinetic solver for radiative transport using integral deferred correction","authors":"M. Crockatt, Kris Garrett, C. Hauck","doi":"10.1109/PLASMA.2016.7534048","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534048","url":null,"abstract":"Summary form only given. An implicit, hybrid method for linear kinetic equations was recently proposed and an implementation using the implicit Euler method was studied1. We present an arbitrarily high order solver based on this hybrid method using integral deferred corrections with respect to the implicit Euler method. The convergence properties of the hybrid method are examined, and multiple test problems are provided to show the efficacy of the hybrid method extends to implicit methods of higher order in both highly collisional and non-collisional regimes.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114105201","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}

{"title":"Detecting terahertz waves using microplasma array","authors":"L. Hou, Xiaowei Han, W. Shi, Hong Liu, Ming Xu, Cheng Ma","doi":"10.1109/PLASMA.2016.7534084","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534084","url":null,"abstract":"Summary form only given. Terahertz (THz) wave real time imaging has promising applications in the fields of nondestructive examination, security detection and so on, however, the present THz focal plane arrays has many defects. The conventional plasma generated by discharging inert gases using DC bias voltage has been used in THz wave detection. Although the conventional plasma detector can obtain a THz image with high resolution and high contrast by raster scan, the speed is slow2. Due to the big size of conventional plasma, we cannot use them to make a THz imaging array. Micro-plasma is a new kind of plasma, the size of which is from several microns to a millimeter. Compared with the conventional plasma, micro-plasma has higher plasma conventional plasma and higher stability, which are benefit to the THz detection. So micro-plasma is suit to be made of a THz imaging array. In this paper, we fabricated a THz imaging array based on micro-plasma by photolithography and e-beam evaporation. The substrate is glass and the electrodes are made by 400 nm Ti and 1 μm Au. Both the electrode width and the electrode gaps are 1 mm, put it into a gas cell and filled neon with the pressure of 532 torr into the cell. The electrodes were biased by high voltage, and the micro-plasma generated between two adjacent electrodes. A 190 GHz Gunn diode was used as a THz source, and it emitted 40 mW THz continue wave. The THz wave was expanded and collimated to a beam with the diameter of 10 mm and illuminated on the micro-plasma array with the size of 10 mm×10 mm. When the discharge current is 0.55 mA, and the bias voltage is 100 V, the output signal from one of the array elements is about 2 mV. The results indicate that the detecting THz waves using microplasma is feasible.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114819075","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}

{"title":"Photoelectric characteristics of volume diffuse DBD in air and water mist","authors":"Y. Gan, B. Chen, L. Wang, C. Zhu, W. Cai, X. X. Gao, J. Fei, X. He, Y. F. Jiang","doi":"10.1109/PLASMA.2016.7534246","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534246","url":null,"abstract":"Summary form only given. Photoelectric characteristics are very important for discharge plasma. A volume diffuse dielectric barrier discharge (DBD) by means of parallel-plate arrays was established, and the methods including electrical parameter and optical emission spectroscopy (OES) were used to diagnose the discharge parameters. The results show that the spectra from discharge both in air and water mist have same trends, and the spectra of hydroxyl radical in water mist are stronger than those in air. However, the energy efficiency ratio (EER) of quantum yield of 337.1nm from N2 presents a functional relationship under different discharge voltage and power. The EER increased with increasing discharge voltage from 32.5kV to 34.5kV, and decreased with decreasing discharge voltage less than 28.5kV in air. It has not contribution for EER with discharge voltage under 30.5kV in water mist. Meanwhile, both the multiple breakdowns and intensity in the discharge current waveform from DBD in air are more prominent than those in water mist. When the input power of high voltage power source is a constant, the discharge power of DBD cell within both air and water mist increased with increasing discharge voltage. Moreover, the equivalent capacitances of the DBD cell, quartz insulating layers and discharge gaps have some relationships with discharge power and voltage. When the discharge voltage is a constant (32.0kV), the equivalent capacitances of both DBD cell and gaps with discharge in air maintained same trends and looked like sine curves with increasing discharge power. The equivalent capacitance of insulating layers slightly increased firstly and then slightly declined with increasing discharge power. Furthermore, the equivalent capacitances of DBD cell, insulating layers and gaps with discharge in water mist maintained as probably different constants, respectively. This work demonstrated the close coupling of the photoelectric characteristics of the discharge voltage and power of volume diffuse DBD, and thus is helpful in the study of the application of volume DBD.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114845324","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}

{"title":"When and why are streamers attracted to dielectric surfaces?","authors":"D. Trienekens, S. Nijdam, G. Akkermans, I. Plompen, M. Merkx, T. Christen, U. Ebert","doi":"10.1109/PLASMA.2016.7534286","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534286","url":null,"abstract":"Summary form only given. Solid insulation surfaces in gas insulated high voltage (HV) equipment can be advantageous or dangerous with respect to dielectric breakdown by a discharge in the gas insulation, depending on whether the surface blocks the discharge (perpendicular, or dielectric barrier, configuration) or allows the discharge to creep along it (tangential configuration). Although discharge propagation along a surface is an old problem, there is still room for improved understanding of the fundamental physics and for the development of knowledge-based design rules for HV equipment. We thus investigate experimentally the initial (streamer) phase interacting with a dielectric surface. We studied streamers inside a gas-filled vessel using ICCD imaging, both stroboscopically as well as with single-shots. Inside the vessel, HV was applied to a needle located 10-15 cm above a grounded cathode. A dielectric sample was placed in the discharge gap. We varied several experimental parameters, such as pressure, gas composition, relative permittivity, pulse voltage and various geometrical parameters to study their effect on the discharge's affinity to prefer the dielectric surface instead of propagating through the bulk gas. Our experimental results provide us with the necessary information to start an in-depth discussion about the important mechanisms governing discharge propagation on surfaces. We show that the local availability of free electrons and the local electric field together determine the behavior of the discharge and explain how several parameters influence this behavior.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124023575","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}

{"title":"The diffusion effect of transverse magnetic field on filamentary atmospheric pressure glow discharge sustained by a resonant power supply","authors":"Yongsheng Wang, W. Ding, Yanan Wang, Jiaqi Yan, Y. Gou, Kaiyang Qiang","doi":"10.1109/PLASMA.2016.7533990","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7533990","url":null,"abstract":"Summary form only given. In our previous study, stable and long-interelectrode gap and large-volume atmospheric pressure glow discharge (APGD) in ambient air has been obtained by using a resonant power supply which can successfully and effectively restrict the development of glow to arc transition. However, the APGD is centimeter-level in the length but only several millimeters in diameter, the energy in the discharge channel is very concentrated, which does not benefit industrial applications. The purpose of this study is to make the plasma channel of the stable but filamentary APGD more diffusive by using a transverse magnetic field. In experiment, the transverse magnetic field which was produced by using the dc power supply electromagnet was perpendicular to the plasma channel. The resonant frequency of discharge power supply can adjust from 10 kHz to 60 kHz. By keeping the distance of interelectrode gap, and input voltage amplitude and frequency of resonant power supply constant, with the increase of the current of electromagnet, the discharge channel did not change in the inceptive certain range, which showed that the diffusion effect was not apparent when the magnetic field intensity was weak. When the current of electromagnet increased to a certain value and the transverse magnetic field was strong enough, the diameter of discharge channel gradually increased and the bright area, which was focused near the channel center before, becomed more uniform. Therefore, the diffusion effect of transverse magnetic field on filamentary APGD obtained by resonant power supply presented to be very effective. When the current of the electromagnet was fixed to a value which was efficient enough to diffuse the discharge channel apparently, then the resonant frequency was adjusted from 10kHz to 60 kHz. With the increase of the resonant frequency, the plasma channel diffuses obviously. Accordingly, a transverse magnetic field can enhance the diffusion effect of resonant frequency on plasma channel. It is very meaningful to study how to obtain stable and long-interelectrode gap and largevolume and uniform APGD by matching up the transverse magnetic and resonant power supply.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127552828","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}

{"title":"Electron power absorption dynamics and ion energy distributions in capacitive discharges driven by customized voltage waveforms in argon and CF4","authors":"B. Berger, S. Brandt, J. Franek, E. Schuengel, M. Koepke, J. Schulze, T. Mussenbrock, B. Bruneau, E. Johnson, T. Lafleur, J. Booth, D. O’Connell, T. Gans, I. Korolov, A. Derzsi, Z. Donkó","doi":"10.1109/PLASMA.2016.7534353","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534353","url":null,"abstract":"Summary form only given. The spatio-temporal electron impact excitation dynamics in a capacitively coupled RF discharge driven by tailored voltage waveforms in Ar and CF4 are investigated experimentally and by PIC simulations. In the experiment, the discharge is driven by up to three consecutive harmonics of 13.56 MHz with individually adjustable harmonics' amplitudes and phases based on a novel RF supply system at pressures between 3 Pa and 200 Pa. The excitation dynamics are investigated by Phase-Resolved Optical Emission Spectroscopy for different shapes of the driving voltage waveform (peaks/valleys/ sawtooth) at fixed total voltage amplitudes. The DC self bias and the ion energy distribution function (IEDF) at the electrodes are also measured. The formation of the IEDFs is understood based on a model that determines sheath voltage waveforms. It is demonstrated that the mean ion energy and the excitation dynamic can be controlled by adjusting the harmonics' phases. In CF4, strongly different excitation dynamics are observed compared to Ar at high pressures and are understood based on the simulation results. The plasma is divided spatially into two different halves of strongly different electronegativity for specific driving voltage waveforms. This asymmetry can be reversed by inverting the driving waveform. For Sawtooth waveforms, the discharge asymmetry and the sign of the DC self bias are found to reverse as the pressure is increased, due to a transition of the electron heating mode from the α-to the Drift-Ambipolar heating mode.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"72 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126205982","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}

{"title":"A model of the fuel target implosion in the external magnetic field","authors":"S. V. Ryzhkov, V. Kuzenov, P. A. Frolko","doi":"10.1109/PLASMA.2016.7534097","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534097","url":null,"abstract":"Summary form only given. The physical and mathematical model and numerical method for calculation of the main parameters of plasma during the implosion of a magnetized target in magneto-inertial fusion (MIF)1-5 are developed.The external magnetic field parallel to the axis of symmetry is an important issue, including penetration of radiation into a plasma and confinement of charged particles in MIF. The external magnetic field on the final stage of compression contributes to the excitation in plasma electromagnetic waves, whose energy can penetrate into the plasma and absorbed throughout the plasma volume. The system of equations describing the processes of heating and evaporation of the metal wall under the influence of thermal radiation from the plasma volume with the radiation flux density, which takes into account the incident laser beam on the wall, is presented. Such system doesn't take into account the hydrodynamic processes in condensed matter, and consists of the heat equation in a moving coordinate system. A model is used to describe the process of fuel target and magnetic field compression.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132908792","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}

{"title":"Electron emission characteristics of BaTiO3 surface flashover trigger device of pseudospark switch","authors":"Zhongde Huang, X. Yao, Jingliang Chen, A. Qiu","doi":"10.1109/PLASMA.2016.7534034","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534034","url":null,"abstract":"Summary form only given. A research on the emission charge of a BaTiO3 surface flashover trigger device and of pseudospark switch (PSS) and its trigger characteristics are presented in this paper. The experimental results have been found that BaTiO3 surface flashover trigger device has more excellent electron emission characteristics than that of ZnO. The electron emission charge Qe of BaTiO3 surface flashover trigger device is mainly influenced by the trigger pulse voltage Utr, the gas pressure p and the DC bias voltage Ubias. Then the trigger characteristics of PSS are investigated.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132933103","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}

{"title":"One dimensional particle-in-cell simulation of relativistic Buneman instability","authors":"R. Rajawat, S. Sengupta","doi":"10.1109/PLASMA.2016.7534085","DOIUrl":"https://doi.org/10.1109/PLASMA.2016.7534085","url":null,"abstract":"Summary form only given. Spatio-temporal evolution of relativistic Buneman instability has been investigated in one dimension using a particle-in-cell simulation code. Starting from the excitation of the instability, its evolution has been followed numerically till its quenching and beyond. It is found that the maximum growth rate(γ_max) reduces due to relativistic effects and varies with γ_e0 and m/M as γ_max ~ √(3/4γ_e0) (m/2M)^1/3, where γ_e0 is Lorentz factor associated with the initial electron beam velocity(v_o) and (m/M) is the electron to ion mass ratio. Further it is observed that in contrast to the non-relativistic results^1,2 at the saturation point, ratio of electrostatic field energy density (E²/8π) to the initial drift kinetic energy density (W₀) scales with γ_e0 as ~1/γ_e0². These results are found to be in good agreement with that derived using fluid theory.","PeriodicalId":424336,"journal":{"name":"2016 IEEE International Conference on Plasma Science (ICOPS)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133608285","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}