IEEE International Conference on Plasma Science

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ISSN 0730-9244

Publications in this journal

  • IEEE International Conference on Plasma Science 01/2014; DOI:10.1109/PLASMA.2014.7012427
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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.
    IEEE International Conference on Plasma Science 01/2014; DOI:10.1109/PLASMA.2014.7012750
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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 -
    Plasma Science (ICOPS), 2013 Abstracts IEEE International Conference on; 06/2013
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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.
    IEEE Pulse Power and Plasma Science Conference, San Francisco – California – USA; 06/2013
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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.
    Vacuum Electronics Conference (IVEC), 2013 IEEE 14th International; 06/2013
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    ABSTRACT: The 2.5D large-signal code TESLA-FW was recently developed with the goal to model TWT amplifiers based on the serpentine or folded-waveguide slow-wave structures. Predictions of the large-signal code, applied to the modeling of the single stage amplifiers, were found in a good agreement with the results of the 3D PIC code MAGIC, while its run-time was on orders of magnitude less. To extend applicability of the large-signal code, now we report its conversion into a parallel version, which allows us concurrently model all the stages of a multiple-beam cascaded TWT amplifiers based on serpentine or folded-waveguide slow-wave structures. Newly introduced parallel version of TESLA-FW is applied to model a 3stage cascaded TWT amplifier to support on-going efforts on its design and further optimization. Obtained results are compared with the predictions of the 3D PIC code MAGIC.
    Vacuum Electronics Conference (IVEC), 2013 IEEE 14th International; 06/2013
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    ABSTRACT: Design improvements and fabrication of a 10 MW, 1.3 GHz Annular Beam Klystron are described. The principal improvement is the electron gun. Utilization of a Controlled Porosity Reservoir (CPR) cathode allows the use of a zero-compression gun, resulting in improved beam quality and reductions in the gun and solenoid diameters.
    Vacuum Electronics Conference (IVEC), 2013 IEEE 14th International; 06/2013
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    ABSTRACT: Research is continuing to develop controlled porosity reservoir cathodes and photocathodes. Advances in design tools and fabrication techniques will be presented as well as available test results for thermionic cathodes and photocathodes.
    Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2013 38th International Conference on; 06/2013
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    ABSTRACT: form only given. Intense pulsed active detection (IPAD) has been proposed as a means of detecting contraband fissile material. In this approach, an intense bremsstrahlung pulse is used to induce photofission, the products of which are detected. In this work, we report on an initial effort to evaluate the applicability of various pulsed-power architectures to this approach. It is assumed the electron energy is 12 MeV with an effective electron charge at 12 MeV of 3 to 5 mC delivered in
    Plasma Science (ICOPS), 2013 Abstracts IEEE International Conference on; 06/2013
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    ABSTRACT: Present magnetic undulators have shortcomings at short periods making them expensive to construct, operate and maintain. The Asymmetric Immersed Pole (AIP) undulator concept avoids many of these complexities by using soft iron to convert axial to transverse field. This paper presents results from an investigation of AIP undulators.
    Vacuum Electronics Conference (IVEC), 2013 IEEE 14th International; 06/2013
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    ABSTRACT: Calabazas Creek Research, Inc. is developing a system for coupling radiation out of gyrotrons that eliminates the external matching optical unit and is broadband. A critical component is a Brewster window in HE1,1 waveguide. This paper describes the design and thermalmechanical modeling of the window.
    Vacuum Electronics Conference (IVEC), 2013 IEEE 14th International; 06/2013
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    ABSTRACT: In this work, an algorithm for coupling external circuit elements to EM PIC simulations is developed. The circuit equation including an external voltage or current source, resistance, inductance, capacitance, and a dynamic load is solved simultaneously with the EM PIC updaters through an instant measured voltage V across the system to obtain the supplied current I for feeding into the system. This external circuit model has been demonstrated and implemented in a 3D conformal finite-difference time-domain PIC code, VORPAL.
    Vacuum Electronics Conference (IVEC), 2013 IEEE 14th International; 06/2013