IEEE International Conference on Plasma Science

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ISSN 0730-9244

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  • No preview · Article · Jan 2014 · IEEE International Conference on Plasma Science
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    ABSTRACT: Was discovered the formation of structures consisting from structures of clusters in dusty plasma at a temperature of liquid nitrogen. The dependence of the reduced electric field E/N in the positive column of a discharge from gas temperature was experimentally measured. Depending on the pressure of neon were observed the different structural transitions in the regions of growing current-voltage characteristics at low discharge currents 0.01≤ I ≤ 1 mA. Were determined the three specific regions of structural transitions. In the region 1 there appear the ordered structures with the lattice similar to the hexagonal with 1D, 2D or 3D clusters located in the sites of lattice. The dust particles forming 2D or 3D cluster, in turn, were in the ordered state. The transition from 2D to 3D clusters was observed at the increase of gas pressure. In the region 2 the destruction of crystals consisting of 3D clusters and the destruction of ordered 3D clusters into individual threadlike (1D) clusters was observed. In the region 3 the dense disordered structures consisting from threadlike clusters were observed. It was found that the regions of existence of structured clusters and the regions of structural transitions, were characterized by the higher values of the reduced longitudinal electric field strength than the regions of destruction of ordered structures.
    No preview · Article · Jan 2014 · IEEE International Conference on Plasma Science
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    ABSTRACT: form is given. This work considers the dynamics of long filamentary pulse discharge generated along the contact zone of two co-flown gases [1], basically: hydrocarbon fuel and oxidizer. The effect of the mixing actuation in compressible flow is observed because of the gas 863 dynamic instability arisen after the discharge generation. The mixing efficiency is examined qualitatively by means of Probe Discharge Breakdown Spectroscopy. An adequate measurement of the mixing efficiency is principally important for this study. The best way for that is to know the concentrations of main components and their spatial distribution. The idea is to realize breakdown of the so-called “probe” discharge that has much less power than the main one at some delay after the main breakdown and to analyze the spectrum of this probe discharge. The temporal resolution of this method is equal to the duration of probe discharge luminescence -
    No preview · Conference Paper · Jun 2013
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    ABSTRACT: form only given. Over the variety of available sensors dedicated to electric (E)-field characterization, the use of antennas constitutes the most widespread technique. While such probes are convenient and provide a good sensitivity, they remain invasive and bandwidth limited. At the opposite, fibered electro-optic transducers1 are fully dielectric, millimeter sized and allow to perform measurements of the E-field vector from DC to several gigahertz and even up to terahertz frequencies using equivalent-time sampling. Furthermore, recent developments lead to a simultaneous characterization of 2 transverse E-field vector components with a single EO probe2. Based on polarization state modulation, the EO transducer is linked to a remote (up to 30 meters) optoelectronic set-up including a ultra low noise laser feeding the probe and a real time optical set-up to manage the modulation treatment. The automated and servo controlled measurement bench is temperature dependent free. The available measurement dynamics exceeds 100 dB, ranging from less than 1 V. m-1. Hz-1/2 up to the breakdown electric field in air.An exhaustive comparison between BO sensors and other technologies will be firstly given during the conference. This analysis will be based on intrinsic sensor properties, such as sensitivity, frequency bandwidth, vectorial selectivity, spatial resolution and induced perturbation on the field to be measured. After recalling the principles of the BO effect, the optical arrangement of the optical probes will be described. The characterization of the BO system will be presented together with experimental results illustrating the potentialities of BO sensors. Among these examples, measurements of pulsed B-field in air (pulsed power), water (specific absorption rate evaluation in pulsed regime) or in plasma (real time evolution of the electrical discharge associated B-field) will be shown.
    No preview · Conference Paper · Jun 2013
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    ABSTRACT: form only given. NOx and associated acids are investigated with regards to their role for biomedical application. NOx are produced by two different plasma sources, a RF kINPen and a μS Plasma gun, both are cold atmospheric pressure plasma jets. The first one is powered by a radio frequency voltage [1, 2] of 1 MHz, the second one is a dielectric barrier discharge powered by a μs pulse voltage [3, 4]. For these two sources, NOx are produced by many complex chemicals reactions occurring in the interaction of the active plume with surrounding air. With the mid infrared quantum cascade laser absorption spectroscopy [1], we are able to measure the absolute density of NO2 and O3 produced by both plasma sources. Correlating the measurements in situ with optical emission spectroscopy, great differences in the excitation processes of fundamental species such as O, N2, OH, N2 and N2+ can be observed. With a parametrical study, varying the voltage and the pulse repetition frequency, we are able to modulate the NO2 densities production from a few tens to a few hundreds of ppb. Such parametric analysis also shows that large variations in the population of the different molecular bands of the NO gamma system, are associated with the plasma gun operation regime. These physical parameters play a major role in the NOx production and yield vital clues to discriminate major kinetic reactions involved in the NO production and in relation with future numerical simulations.
    No preview · Conference Paper · Jun 2013
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    ABSTRACT: Simulations of modern, high current electron beam lithography devices may require modeling of optical components and multiple electron sources that are positioned in an oblique fashion with respect to the main device axis and include counter streaming regions, where two beams are co-located in space while propagating in opposite directions. Modeling such complex multi-beam systems presents different computational challenges depending on the specific device and regime being modeled. Applications of interest require in some cases the model of both global and stochastic space charge, where the latter requires direct evaluation of Coulomb interactions. A new approach implemented in MICHELLE-eBEAM is designed to take advantage of the GPU hardware acceleration and novel algorithms to efficiently capture particle dynamics for complex beamlines. In this paper we report on our latest progress and show for a high current electron beam lithography application the achieved accuracy and performance of the new code.
    No preview · Conference Paper · Jun 2013
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    ABSTRACT: Literature indicates that introduction of Nano fillers into PP films will improve its electrical characteristics, such as the PD resistance, breakdown strength and loss factor [1]. Some dielectric properties of Nano filled polymers have shown remarkable improvements such as permittivity and space charge accumulation [2]. This research work investigates the effect of Nano fillers content on the PD resistance and Breakdown strength of the polypropylene films with 0%, 2% and 6% organoclay Nano fillers when the samples are subjected to Surface Discharges. The degree of erosion is quantified through microscopic and surface profilometer measurements that will help to figure out the resistance of the sample to surface discharges.
    No preview · Conference Paper · Jun 2013
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    ABSTRACT: form only given. Discontinuous Galerkin finite element methods (DG-FEM) are a powerful solution technique for nonlinear hyperbolic conservation laws, such as those that arise in the modeling of plasma. DG-FEM can be applied to achieve high-order spatial accuracy; however, one drawback of classical DG-FEM with explicit time-stepping is their poor CFL restriction compared to high-order finite difference or finite volume counterparts. In kinetic models of collisionless plasma, i.e. kinetic Vlasov models, this small time step problem is further exacerbated due to the possibility that some particles in the system may travel at moderate to large velocities. In this work, we extend our single dimension, 1D-1V semi-Lagrangian discontinuous Galerkin (SLDG) method1 to 2D-2V, two dimensions for configuration space, and two dimensions for velocity space. The DG representation allows us to capture complicated geometries in configuration space through the use of unstructured grids. Our method uses operator splitting techniques that enable us to apply different time stepping options in each direction. For velocity space, we use the semi-Lagrangian DG method on a structured grid that removes CFL limitations on the electric field. For configuration space, we apply explicit Runge-Kutta time stepping on unstructured grids. In order to mitigate restrictive CFL conditions, each sub-problem is sub-cycled according to a local velocity. Due to the fact that the proposed scheme is mesh-based and high-order accurate, we can compute solutions with much less statistical noise than what is found in traditional particle-in-cell (PIC) solutions of comparable resolution. We present simulation results for the formation of a plasma sheath in a collisionless plasma. We start with a 1D problem, and then demonstrate how the multi-D extension performs on a radially symmetric cylinder. We argue that our high-order mesh based method allows us to simultaneously produce accurate results - or the plasma sheath near the wall as well as the quasi-neutral region.
    No preview · Conference Paper · Jun 2013
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    ABSTRACT: Numerical simulations of the process of microwave energy release from a high-power microwave compressor comprising a gas-filled cavity and interference plasma switch were carried out. A microwave plasma discharge was modeled by setting artificial ionization rate in the rectangular waveguide H-plane tee. The interaction of the plasma with RF fields accumulated in the cavity was simulated using the particle-in-cell approach accounting for electron-neutral transport collisions. The dependences of the microwave output pulse peak power and waveform versus the ionization rate, the plasma size, form, and location, the RF field amplitude, and the background gas type and pressure were investigated.
    No preview · Conference Paper · Jun 2013
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    ABSTRACT: Field emitter arrays have the potential to provide high current density, low voltage operation, and high pulse repetition for radar and communication. It is well known that packing density of the field emitter arrays significantly affect the emission current1. Previous experiments were conducted with 1000s of field emitters which makes the analysis of electric field screening difficult. Here we describe experiments in a dual-cathode and four-cathode configuration2. The experiments used different number of carbon fiber field emitters (two and four) with variable spacing to investigate the effect of electric field screening on current emission. Emission characteristic is compared for the case of two and four field emitters with different spacing. Analytic model and Particle-in-cell simulations are performed to compare with the experiments.
    No preview · Conference Paper · Jun 2013
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    ABSTRACT: form only given. A compact, 94-GHz extended interaction klystron (EIK) amplifier has been developed and tested. A peak power of over 6.6 kW has been measured at the output flange of the device (in air), corresponding to over 8 kW at the output cavity aperture (in vacuum). The observed output is in excellent agreement with 3-D PIC simulations. The EIK is driven by a 19-21 kV, 3.5-4 A sheet beam in a permanent magnet solenoid, with 99% of the beam current transmitted through a 0.4 × 5 mm × 2.6-cm-long beam tunnel. The circuit consists of three identical 5-gap cavities that can be tuned individually. Tuning the buncher cavity allows gain to be traded for peak power. A sample drive curve is shown below. This amplifier demonstrates the significant increase in power that can be achieved at a given operating voltage by substituting a sheet beam for the pencil beam used in conventional vacuum electronic amplifiers. It also validates the use of solenoidal focusing for high-perveance sheet beams. High-peak-power testing and the potential for high-average-power operation will be discussed.
    No preview · Conference Paper · Jun 2013