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Plasma Science, IEEE Transactions on

Issue 5 • Date May 2013

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Displaying Results 1 - 15 of 15
  • Table of contents

    Page(s): C1
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  • IEEE Transactions on Plasma Science publication information

    Page(s): C2
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  • Design Expressions for the Magnetically Insulated Line Oscillator

    Page(s): 1549 - 1556
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (788 KB) |  | HTML iconHTML  

    In this paper, a simple compact magnetically insulated line oscillator (MILO) design methodology, simulation, and optimization are described the MILO device combines the technologies of magnetically insulted electron flow with the slow-wave structure, and the device operates at a wide range of voltage (0.1 MV ≤ V ≤ 1 MV). The authors present the design methodology for a load-limited MILO device of a desired oscillation frequency, radio-frequency (RF) power, and applied dc voltage. An S-band MILO is designed and simulated using commercial particle-in-cell code MAGIC, for 600-kV dc voltage and 35-kA beam current. The simulated value for RF power is found to be in agreement with the designed value within 5% and an average output power of 1.05 GW at designed 2.725-GHz frequency is obtained. View full abstract»

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  • Analysis of Beam and Magnetic Field Parameter Sensitivity of a Disc-Loaded Wideband Gyro-TWT

    Page(s): 1557 - 1561
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (669 KB) |  | HTML iconHTML  

    The performance of a disc-loaded gyro-traveling wave tube (gyro-TWT), which is optimized a priori by controlling the structure parameters for wide device bandwidths at large gains, is analyzed for studying the sensitivity of the gain and bandwidth of the device to the beam and the magnetic field parameters. Hence, it is predicted that the optimum beam and the magnetic field parameters will result in a much wider bandwidth at a larger gain than that of a smooth-wall gyro-TWT. View full abstract»

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  • Experimental Results of a Combined DBD Reactor-Catalyst Assembly for a Direct Marine Diesel-Engine Exhaust Treatment

    Page(s): 1562 - 1569
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2014 KB) |  | HTML iconHTML  

    This paper gives an overview of a robust dielectric barrier discharge reactor-catalyst construction used in a bypass of a marine diesel-engine exhaust gas system. Electrode arrangement, housing, and electrode positioning systems are discussed allowing for high temperature and reasonable vibration operation. Preliminary test results are given considering the chemical reactions, particulate matter, and CO and HC reductions. An operative removal efficiency up to 99 percent is obtained (relative percentage units with respect to initial maximal concentrations). The basics of power supply construction and output waveforms are given. View full abstract»

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  • Generating the Optimum Self-Focusing in the Relativistic Laser-Plasma Interaction

    Page(s): 1570 - 1574
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (518 KB) |  | HTML iconHTML  

    In this paper, the effect of basic parameters of laser and plasma on controlling self-focusing is investigated, and based on the introduced effective parameter for self-focusing (EPSF), the effects of laser wavelength, the initial spot size of laser beam, the initial intensity of laser, and the plasma electron density on self-focusing are discussed. It is found that the relativistic self-focusing strongly depend on the laser wavelength and the beam intensity. The nonlinear effect of beam intensity on the introduced parameter EPSF indicates that after an increasing region for focusing, the self-focusing effect decreases at ultrarelativistic intensities. The effect of the initial beam spot size on the introduced parameter EPSF indicates that pulses with larger spot sizes can be focused stronger, and the diagram of EPSF versus the electron density shows the direct dependence between self-focusing and the initial plasma density. The nonlinear effect of laser wavelength on self-focusing also is studied at relativistic and ultrarelativistic intensities. The presented model introduces the optimum selection of laser and plasma parameters for achieving the desired focused/unfocused laser beam in the relativistic laser-plasma interaction. View full abstract»

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  • Analysis of JET Polarimeter With a Propagation Code Based on the Stokes Formalism

    Page(s): 1575 - 1586
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1434 KB) |  | HTML iconHTML  

    Internal magnetic measurements are essential to obtaining reliable and accurate magnetic reconstructions in the interior of the plasma column in Tokamaks. In the last years, polarimetry has been increasingly used to provide global constraints to equilibrium codes. Joint European Torus (JET) polarimeter has four lateral channels, whose arrangement is similar to the topology of the diagnostic foreseen in ITER. A statistical analysis of JET polarimetry measurements have been provided in the past for only one vertical channel (CH3) using a polarimetry propagation code based on the Stokes vector formalism. A new propagation code has therefore been developed for the lateral channels to simulate and interpret the measurements of the Faraday rotation (FR) and Cotton-Mouton (CM) phase shift in JET. In this paper, a complete analysis of the integral form of the Stokes equation for the lateral channels is presented. In particular, the analysis shows that there is a strong interaction between the FR and CM effect even at low currents and low magnetic fields. The code results of both FR and CM have been used to estimate the line-integrated density and a proper benchmarking with experimental data has been performed. Two approximations to obtain the electron density in real time, using only plasma current in case of FR measurements and also toroidal magnetic fields in case of CM measurements, are proposed. View full abstract»

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  • High Voltage Pulse Generator Using Transformer Parasitic Components for Pulsed Corona Discharge Generation

    Page(s): 1587 - 1593
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1315 KB) |  | HTML iconHTML  

    This paper proposes a new topology of a nanosecond, high voltage pulse generator devoted to pulsed corona discharge (PCD) reactor supply. The proposed topology is based on solid state, semiconductor switches and uses parasitic components of transformers. A prototype construction of the proposed generator loaded with a PCD reactor with 6.4-pF capacitance is able to generate high voltage pulses with maximum amplitude of 14 kV (using 5.4-kV supply and up to six modules of proposed topology, each equipped with a MOSFET transistor with 1-kV blocking capability) with voltage steepness of 730 V/ns. Obtained pulses are 65-ns long. The peak power delivered to the PCD reactor is > 0.3 MW while the energy consumed reaches 7 mJ/pulse. This paper also compares two different mechanical constructions of such generators and gives an overview of analytical and numerical voltage waveform analyzes. View full abstract»

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  • Research on Commutating Over-Voltage Protection for ITER Poloidal Field Converter

    Page(s): 1594 - 1599
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (800 KB) |  | HTML iconHTML  

    This paper presents the commutating over-voltage snubber circuit design method of a thyristor converter that is applied to the International Thermonuclear Experimental Reactor poloidal field-converter module. In the course of poloidal field ac/dc converter normal operation, large transient surges called commutating over-voltages may be generated internally during the commutating process of thyristor, which poses a severe threat to system reliability and needs to be suppressed. In this paper, based on the analysis of reverse recovery transient of the parallel thyristors, the turn-off model of the PF converter thyristor is created and analytical expressions are derived, including the over-voltage crest value and the maximum over-voltage rise rate. Utilizing the analysis results, a systematic approach to the RC snubber circuit design is described. View full abstract»

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  • Nonplanar Ion Acoustic Solitary Waves in Electron-Positron-Ion Plasma With Warm Ions, and Electron and Positron Following Q-Nonextensive Velocity Distribution

    Page(s): 1600 - 1606
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (797 KB) |  | HTML iconHTML  

    Cylindrical and spherical modified Korteweg-de Vries equations are derived for ion-acoustic solitary waves (IASWs) in an unmagnetized, collisionless electron-positron-ion plasma consisting of warm ion fluid and q-nonextensive distributed electrons and positrons by using standard reductive perturbation method. The effects of nonplanar geometry, nonextensivity of electrons and positrons, and other plasma parameters on nonlinear dynamics of cylindrical and spherical IASWs are studied numerically. Numerical results indicate that the amplitude of the soliton is large in spherical geometry in comparison with cylindrical geometry, and both the electron and positron nonextensive parameter has a significant effect on the structure of the nonplanar IASWs. View full abstract»

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  • Gardner Solitons and Double Layers in a Multi-Ion Plasma With Degenerate Electrons

    Page(s): 1607 - 1613
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1326 KB) |  | HTML iconHTML  

    A precise theoretical investigation is made on ion-acoustic (IA) solitary waves (SWs) and double layers (DLs) in a degenerate multi-ion plasma (composed of inertial positive and negative ions and degenerate electrons). The standard reductive perturbation method is employed to derive the Korteweg-de Vries (K-dV), the mixed K-dV (mK-dV), and the Gardner (GE) equations. The GE admits SW and DL solutions for μ around its critical value μc (where μc is the value of μ corresponding to the vanishing of the nonlinear coefficient of the K-dV equation). The basic features of IA SWs and DLs are analyzed. It is found that the characteristics of IA SWs found from GE are different from those of the K-dV solitons and mK-dV solitons. The implications of our results to different space and laboratory plasma situations, where opposite polarity ions are observed, are briefly discussed. View full abstract»

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  • Roles of Dust Grains on Electrostatic IA Shocks in Highly Nonlinear Dense Plasma With Degenerate Electrons

    Page(s): 1614 - 1619
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1974 KB) |  | HTML iconHTML  

    A rigorous theoretical investigation is made on the highly nonlinear propagation of electrostatic shock waves in degenerate dense two-fluid plasma with relativistic electrons and inertial ions with the additional negatively charged dust grains. 1-D evolution of electrostatic shock waves is found to exist in such a plasma system employing the reductive perturbation method. It is also found that a highly nonlinear wave can propagate in the system whose profiles are showed with the solution of modified Burgers' equation with the usual one. This is an unique finding among all the theoretical investigations made before whose probable implications are discussed in this investigation. The implications of the results obtained from this unique investigation in space and laboratory experiments are briefly discussed. View full abstract»

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  • Special issue on SOFE 2014

    Page(s): 1620
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  • IEEE Transactions on Plasma Science information for authors

    Page(s): C3
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  • Affiliate Plan of the IEEE Nuclear and Plasma Sciences Society

    Page(s): C4
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Aims & Scope

IEEE Transactions on Plasma Sciences focuses on plasma science and engineering, including: magnetofluid dynamics and thermionics; plasma dynamics; gaseous electronics and arc technology.

 

 

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Meet Our Editors

Editor-in-Chief
Steven J. Gitomer, Ph.D.
Senior Scientist, US Civilian Research & Development Foundation
Guest Scientist, Los Alamos National Laboratory
1428 Miracerros Loop South
Santa Fe, NM  87505  87505  USA
tps-editor@ieee.org
Phone:505-988-5751
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