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Plasma Science, IEEE Transactions on

Issue 6 • Date June 2014

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Displaying Results 1 - 13 of 13
  • Table of contents

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

    Page(s): C2
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  • Guest Editorial The Fifteenth Special Issue on High-Power Microwave Generation

    Page(s): 1481
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  • A Tribute to Dr. Robert (Bob) J. Barker 1949–2013

    Page(s): 1482 - 1483
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  • A Comparison of Multipactor Predictions Using Two Popular Secondary Electron Models

    Page(s): 1484 - 1487
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (937 KB) |  | HTML iconHTML  

    Multipactor is a resonant phenomenon in which an electromagnetic field causes stray electrons to impact a surface, liberating secondary electrons, in such a way that the process can sustain itself. This phenomenon is of considerable practical interest in the design and operation of microwave windows, waveguides, and radio frequency resonant structures. The formation of multipactor is strongly dependent upon the secondary electron yield (SEY) of a surface, and the emission velocities of the emitted electrons. Two SEY models are popular within different technical communities: 1) the microwave industry frequently uses a model proposed by Vaughan and 2) the particle accelerator community frequently uses a model proposed by Furman and Pivi. This research examines the level of agreement between multipactor predictions using the two SEY models. View full abstract»

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  • Investigations on Dispersion and Gain in Nonstaggered Bilateral Metal-Grating Periodic Structure With Electron Beam

    Page(s): 1488 - 1494
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    A linear theory of a nonstaggered bilateral metal-grating periodic slow-wave structure with a sheet electron beam is developed using the Borgnis potential function and field-matching method. The field-matching method has been used at the upper and bottom waveguide boundaries where the metal-grating structure is used to slow down the electromagnetic phase velocity. The derived dispersion equation has been solved through the iterative technique. Numerical calculations show the effects of some parameters on the linear growth rate. Moreover, the influences of the structural asymmetry on the linear growth rate have been analyzed as well. View full abstract»

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  • Electromagnetic Properties of a Trapezoidally Corrugated Slow Wave Structure for Backward Wave Oscillators

    Page(s): 1495 - 1501
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2459 KB) |  | HTML iconHTML  

    In this paper, the electromagnetic properties of a beam free trapezoidally corrugated slow wave structure (TCSWS) are numerically and experimentally investigated. The dimensions of the TCSWS are selected so that it can be deployed in X-band backward wave oscillators (BWOs). The theoretical dispersion characteristics for the axisymmetric TM01-TM03 modes are obtained by solving the dispersion equation numerically. In order to verify the numerical calculation, a cold test is conducted using a 6-period TCSWS cavity and a vector network analyzer (VNA). The cavity is excited by a small needle-type antenna and frequency of the VNA is swept over the passbands. The dispersion characteristics are obtained from frequency values of the discrete resonant peaks of reflection measurement of each TM mode. Experimental results show an excellent agreement with numerical ones. The numerical and cold test results reveal that TCSWS can be used as an alternative to sinusoidally corrugated slow wave structure in BWO experiments with an advantage of ease of fabrication. View full abstract»

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  • Study of High-Power Ka-Band Rectangular Double-Grating Sheet Beam BWO

    Page(s): 1502 - 1508
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    It is attractive to use sheet beam vacuum devices to generate high frequency, high-power microwave radiation. In this paper, we present the numerical and experimental studies of a high-power Ka-band sheet electron beam backward wave oscillator (BWO), in which the double-grating rectangular waveguide is used as the slow wave structure (SWS) for its thermal and mechanical robustness. The fundamental mode of this kind of SWS is an antisymmetric mode which has an antisymmetric longitudinal field distribution and will nonsynchronously interact with the electron beam on two sides of the electron channel along the vertical direction. We put forward a method to overcome this trouble in this paper. To drive this BWO, a high-power sheet beam is used with a cross section of 30 mm × 1 mm. A thin graphite cathode is used for its superiority in producing a high current, high-quality electron beam. For an experimental electron beam of 141 kV and 1668 A, the output power of over 46.8 MW at 31.68 GHz is obtained, which corresponds to a beam-wave interaction efficiency of 19.9%. Compared with the conventional hollow beam BWO and the single-grating rectangular waveguide sheet beam BWO, the double-grating sheet beam BWOs efficiency is higher, which indicates that the double-grating sheet beam device is promising for producing millimeter wave radiation with high power and high efficiency. View full abstract»

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  • Modeling of Reflex Triode Virtual Cathode Oscillator

    Page(s): 1509 - 1514
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    An investigation of the reflex triode virtual cathode oscillator based on simulations with 3-D particle-in-cell code developed by ATK Mission Systems is done. The device model is based on an actual experimental setup with 15-mm anode-cathode gap. The obtained simulation results use a single-shot 200-kV, 300-ns pulse at anode. Numerical analysis is done to validate the results and to gain insight into the dynamics of the electrons emitted from the cathode surface and their movement between the cathode and the virtual cathode. The obtained single dominant microwave frequency for the model is 2.35 GHz with virtually no competing frequencies. View full abstract»

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  • High Pulsed Power Compact Antenna for High-Power Microwaves Applications

    Page(s): 1515 - 1521
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    Thales Communications and Security has developed, under Commissariat à l'Énergie Atomique et aux Énergies Alternatives contract, a new concept of compact antenna able to radiate very high pulsed power levels in C-band and X-band. These antennas could be powered by relativistic sources, such as magnetrons or backward wave oscillators (BWO). This antenna principle is based on an array of helixes, whose dimensions are linked to the desired gain and central frequency. Pulsed power-typically a few hundreds of megawatts-feeds the antenna via a circular waveguide in TM01 mode. These works were successfully verified with a first example of such an antenna, developed in X-Band and tested with a BWO delivering 10-ns long and 500-MW peak pulses, repeated at 100 Hz. View full abstract»

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  • Design of 170 GHz, 1.5-MW Conventional Cavity Gyrotron for Plasma Heating

    Page(s): 1522 - 1528
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    In this paper, an overall conceptual design of a 170 GHz, 1.5 MW, continuous wave (CW) conventional cavity gyrotron is presented for plasma heating applications in thermonuclear fusion reactors. The operating mode is carefully selected with due consideration of design constraints/goals and mode competition. The TE36,10 mode is selected as operating mode for the present study. A weakly tapered conventional cavity resonator is considered for the study of the RF-behavior. Single mode and multimode time dependence self-consistence calculations are carried out for power and efficiencies. In addition, the design studies of a triode type magnetic injection gun, magnetic guidance system, output system that consists of an optimized nonlinear taper, a highly efficient dimpled-wall quasi-optical launcher and a single disk Chemical Vapor Deposition diamond window are also reported. Results obtained support an output power of 1.5-MW CW power at 170 GHz with a conventional cavity gyrotron with 35% efficiency without single stage depressed collector. This device is intended to serve as heating source for international thermonuclear experimental reactorlike machines. View full abstract»

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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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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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Steven J. Gitomer, Ph.D.
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Guest Scientist, Los Alamos National Laboratory
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