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IEEE Transactions on Magnetics

Volume 22 Issue 6 • November 1986

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Displaying Results 1 - 25 of 108
  • [Front cover and table of contents]

    Publication Year: 1986, Page(s): 0
    Request permission for commercial reuse | PDF file iconPDF (499 KB)
    Freely Available from IEEE
  • Peter Mark medal, 1986

    Publication Year: 1986, Page(s): 1378
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    Freely Available from IEEE
  • Introduction

    Publication Year: 1986, Page(s): 1379
    Cited by:  Papers (4)
    Request permission for commercial reuse | PDF file iconPDF (146 KB)
    Freely Available from IEEE
  • Rail and insulator erosion in rail guns

    Publication Year: 1986, Page(s):1380 - 1385
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    A persistent problem in rail guns is the erosion of rails and insulators, particularly near the breech. This is especially pronounced after multiple firings. Systematic experiments have been conducted using a 60 cm test bed facility designed for materials studies. Current waveforms characteristic of the early time for rail guns of 3-5 meters have been applied to the system using metal foil for the... View full abstract»

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  • Design of a 40 megawatt homopolar generator

    Publication Year: 1986, Page(s):1386 - 1388
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Westinghouse Electric Corporation has designed, under contract to Rocketdyne Division of Rockwell International, an iron-core homopolar generator rated at over 40 megawatts. The generator has been designed for up to 5 seconds of continous operation at this level, which makes it well suited to the pulse compression duty required for electromagnetic launchers and other applications. The generator ut... View full abstract»

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  • A comparison of armature performance

    Publication Year: 1986, Page(s):1389 - 1394
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    All electromagnetic launchers require that the launch package have an armature. The armature is the component in which the electromagnetic forces are generated. In this paper we examine "armature efficiency" as one measure of armature performance which permits direct comparison of metal, plasma, and hybrid armatures. Efficiency also translates directly to energy and power requirements. In this pap... View full abstract»

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  • In-bore railgun projectile velocity

    Publication Year: 1986, Page(s):1395 - 1398
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    This paper describes a simple experimental technique that can provide a continuous velocity-time history of a projectile during railgun acceleration. The technique essentially involves monitoring flux expansion in the railgun. It is accomplished by linking "all" of the flux produced by the railgun with a loop of wire which encompasses the entire railgun. Theory and experimental results are describ... View full abstract»

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  • Preliminary results from the multishot opening switch and barrel testing at ARDC

    Publication Year: 1986, Page(s):1399 - 1403
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    The General Electric (GE) Multishot Switch and Barrel have been designed and assembled, and preliminary testing has been carried out at the Armament Research and Development Center (ARDC) at Dover, NJ. The Electromagnetic Launcher System incorporates an existing homopolar generator, storage inductor, and range tank with the GE switch and barrel into a Multishot Facility capable of three 500 kA sho... View full abstract»

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  • A novel simulation approach for electromagnetic gun barrels

    Publication Year: 1986, Page(s):1404 - 1406
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    An approach to modeling a railgun barrel for performance simulations is discussed that is simple and readily implemented and yet is more representative of actual barrel performance due to electric/thermal effects. This novel, but simple, methodology differs from most of the dynamics equations. Instead, the barrel is discretized into small "cell" sections whose performance parameters vary linearly ... View full abstract»

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  • Advanced electromagnetic gun simulation

    Publication Year: 1986, Page(s):1407 - 1409
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The objectives of this simulation are to support the varlous ElectroMagnetic Gun (EMG)operability requirements, to be maintainable, to duplicate test results or simulate a theoretical system, and to be able to rapidly assess performance and conduct trade studies. This versatile simulation is capable of both performance analysis and some limited component sizing studies. The simulation will permit ... View full abstract»

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  • EMET technology for rail launchers

    Publication Year: 1986, Page(s):1410 - 1415
    Cited by:  Papers (18)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1696 KB)

    The EMET concept is a marriage of electrothermal plasma jet technology with rail accelerators using plasma armatures. By injecting a structured plasma immediately behind a moving projectile prior to the current pulse, the plasma armature properties can be highly controlled. Parameters of interest are the armature mass and length, molecular weight, specific heat ratio gamma, and temperature. Proper... View full abstract»

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  • Preliminary study of a propellant-driven, pulsed MHD generator-powered, small caliber EML

    Publication Year: 1986, Page(s):1416 - 1422
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Battelle's Columbus Division recently completed a Small Caliber Electromagnetic Launcher (EML) Engineering Feasibility Study Program under funding from the U.S. Army Armament Research and Development Center's Joint Services Small Arms Program. Included in the study program was a preliminary feasibility and conceptual design study of a novel, hybrid EML with a pulsed, magnetohydrodynamic (MHD) gene... View full abstract»

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  • Observation and analysis of current carrying plasmas in a railgun

    Publication Year: 1986, Page(s):1423 - 1428
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    Observation of current-carrying plasma arcs driving solid projectiles in round-bore and square-bore railguns have been made with magnetic induction coils. Both free-running precursor arcs as well as projectile armature arcs are observed. Qualitative behavior of the plasmas is inferred from data and compared to basic physical models. The non-uniform nature of the force on the armature is investigat... View full abstract»

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  • The reconnection gun

    Publication Year: 1986, Page(s):1429 - 1434
    Cited by:  Papers (35)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    An electromagnetic launcher called the reconnection gun is introduced. Its potential performance is shown to be superior to that of a modern railgun for projectiles with mass greater than a few hundred grams. It has a "characteristic velocity" which is an order of magnitude lower for much lower energy loss to ohmic heating. Also, it has several advantages for producing higher acceleration includin... View full abstract»

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  • Predicting bore deformations and launcher stresses in railguns

    Publication Year: 1986, Page(s):1435 - 1440
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The structural responses of launchers are important because they affect the projectile performance and the operating limits of the railgun system. Structural analysis makes it possible to make better decisions in launcher design. Example analyses of the Los Alamos HIMASS and Lethality Test System launchers are presented in this paper. Also, a discussion of the benefits and limitations of these ana... View full abstract»

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  • Electrode erosion in high current, high energy transient arcs

    Publication Year: 1986, Page(s):1441 - 1447
    Cited by:  Papers (36)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    Electrode erosion in high current, high energy spark gaps was examined both theoretically and experimentally. A brief description is given of the production of high velocity, high temperature electrode vapor jets which are shown experimentally to be the major source of electrode erosion under these conditions. Consideration of a simple one dimensional thermal model with the vapor jet considered as... View full abstract»

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  • Two-dimensional current diffusion in an EML rail with constant properties

    Publication Year: 1986, Page(s):1448 - 1452
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    We develop an exact solution to Maxwell's equations to describe the diffusion of the current both along and across an EML rail which satisfies appropriate boundary conditions on all rail surfaces. We argue that assuming a sheath of current uniform along the rail (the 1-D solution) leads to underestimates of the Joule heating near the bore surface, and hence overestimates of the survivability of th... View full abstract»

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  • Electromagnetic induction launchers

    Publication Year: 1986, Page(s):1453 - 1458
    Cited by:  Papers (23)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The electromagnetic launcher consists of a system of stator coils producing a traveling field which accelerates an armature carrying currents induced by the traveling field (induction accelerator [1,2]) or persistent currents supplied from otner sources (synchronous accelerator [2,10]). The fact that their armature has no electrical contact with the stator, essentially riding on the crest of a tra... View full abstract»

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  • Focusing experiments in plasma coaxial railguns

    Publication Year: 1986, Page(s):1459 - 1463
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1400 KB)

    The "projectile" being accelerated in a plasma coaxial railgun is a complex mixture: besides plasma, it contains solid particles of fuse, liquid and vapor metal. Materials accelerated are not limited to the fuse metal, the rail material through ablation also contributes to them. For such a situation "plasma focusing" is a simplified term, borrowed from electron beams in vacuum technology (and elec... View full abstract»

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  • The potential of hydrogen armature experiments

    Publication Year: 1986, Page(s):1464 - 1465
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (126 KB)

    Unlike aluminum or copper plasma armatures, hydrogen armatures of the same temperature and electron density are virtually transparent to ultraviolet and are totally transparent to soft x-rays (∼ 20 eV). Thus, it may be feasible to observe significant interior plasma dynamics with an appropriate experimental device. Some possible experiments of this type are discussed. The typical rail gun ar... View full abstract»

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  • Soft acceleration of a metal plate by a rail gun plasma

    Publication Year: 1986, Page(s):1466 - 1469
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The following situation is considered: A dense plasma armature which has been accelerated to a high velocity in a rail gun is allowed to impact a stationary metal plate. At impact, a shock wave is transmitted into the plate and a shock wave is reflected back into the plasma. For very high plasma velocities, the subsequent behavior depends primarily on the plasma density profile just prior to impac... View full abstract»

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  • On the design of an integrated metal armature and sabot for railguns

    Publication Year: 1986, Page(s):1470 - 1474
    Cited by:  Papers (10)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    Proper design of a solid metal armature and sabot is critical to obtain optimal railgun performance and to reduce rail wear. Previous armature designs only considered bulk ohmic heating and static mechanical design of the armature. This report discusses the extension of the analysis of armature heating to include thermal heating induced by sliding friction at the armature-rail interface, and the e... View full abstract»

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  • Railguns powered by explosive driven flux compression generators

    Publication Year: 1986, Page(s):1475 - 1480
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    Explosive driven flux compression generators (FCG's) are single-shot devices that convert part of the energy of high explosives into electromagnetic energy. Some classes of these generators have served quite well as railgun power sources. In this paper and the following paper we describe strip and helical type FCG's, both of which are in use in the Los Alamos railgun program. Advantages and disadv... View full abstract»

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  • Lethality testing involving railgun simulators

    Publication Year: 1986, Page(s):1481 - 1484
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The Lethality and Target Hardening (LTH) Program directed by the Defense Nuclear Agency has the mission of developing lethality data for Strategic Defense Initiative (SDI) designated missiles and other targets. For kinetic energy evaluations, data must be developed at various velocities for a variety of projectile masses in order to determine the kill of the targets. The electromagnetic launcher (... View full abstract»

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  • New high current meatgrinder experiments

    Publication Year: 1986, Page(s):1485 - 1488
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    An inductive storage and transfer circuit (single step Meatgrinder) has been operated in the 30 kA regime using a fuse/CVR (Constant Voltage Resistor) combination as the opening switches. A energy transfer efficiency (percentage of energy in storage inductor delivered to an uncoupled load inductance) of 38.4% was measured. View full abstract»

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Aims & Scope

IEEE Transactions on Magnetics is a peer-reviewed, archival journal in science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The journal publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Pavel Kabos
National Institute of Standards and Technology