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IEEE Transactions on Magnetics

Issue 2 • Date March 1984

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Displaying Results 1 - 25 of 68
  • [Front cover and table of contents]

    Publication Year: 1984, Page(s): 0
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  • New medal to honor Dr. Peter mark

    Publication Year: 1984, Page(s): 198
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  • Introduction

    Publication Year: 1984, Page(s): 199
    Cited by:  Papers (1)
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  • Pulsed power requirements for electromagnetic launchers

    Publication Year: 1984, Page(s):200 - 202
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    Both linear (railgun) and coaxial (mass driver, etc.) electromagnetic launchers (EMLs) are treated as time-varying impedances to determine the relationships between acceleration force, payload velocity, and power supply voltage and current. These relationships are then examined in the light of electromagnetic parameters associated with each EML type to establish a basis for determining and compari... View full abstract»

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  • Compact homopolar generator developed at CEM-UT

    Publication Year: 1984, Page(s):203 - 206
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (784 KB)

    For electromagnetic launchers (EMLs) to become practical devices, they must evolve from laboratory test beds to field-portable systems. Such systems require the development of compact, lightweight, high-energy, high-current power supplies. Investigation of the candidate systems -- flux compressors, capacitors, inductors, batteries, and rotating machines -- showed the homopolar generator (HPG) to b... View full abstract»

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  • A systems tester for compact HPG component development

    Publication Year: 1984, Page(s):207 - 210
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    To facilitate the development of more compact homopolar generators (HPGs), the compact HPG systems tester was designed and built to develop the system and component technology necessary to design HPGs having energy densities of up to 60 MJ/m3. The systems tester is one-half of a full-scale counter-rotating HPG storing 2.5 MJ at 6,900 rpm and generating 20 V. Incorporated in the tester a... View full abstract»

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  • A compulsator driven rapid-fire EM gun

    Publication Year: 1984, Page(s):211 - 214
    Cited by:  Papers (15)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    A compulsator-driven railgun is an attractive alternative to the homopolar generator-inductor-switch configuration, especially for repetitive duty. A conceptual design of a rapid-fire EM-gun system is presented. The generator is sized to accelerate a 0.08-kg projectile to 2 to 3 km/s at a 60 pulse-per-second repetition rate. Initial design parameters are discussed, and example current and velocity... View full abstract»

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  • Fabrication of a compact storage inductor for railguns

    Publication Year: 1984, Page(s):215 - 218
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    A liquid nitrogen-cooled, coaxial, energy storage inductor has been designed and built to be used in conjunction with a compact homopolar generator to form a high-energy-density power supply for use with electro-magnetic accelerators. The low-resistance, lightweight aluminum inductor stores 3.1 MJ at a peak current of 1.0 MA. Minimizing weight rather than size was emphasized in the design, resulti... View full abstract»

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  • Physical scale modeling to verify energy storage inductor parameters

    Publication Year: 1984, Page(s):219 - 222
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    In the pulse charging and discharging of energy storage inductors, the influence of I2R heating, magnetic diffusion skin depth, and eddy current losses must be evaluated. These effects are not easily treated analytically. To address these problems, the system can be constructed according to governing scaling laws. The performance of the model can then be evaluated and scaled up to predi... View full abstract»

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  • A reusable inverse railgun magnetic flux compression generator to suit the earth-to-space-rail-launcher

    Publication Year: 1984, Page(s):223 - 226
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    Historically, the development of railguns was stymied by the lack of suitable power supplies to drive them. In the last decade or so, that situation has changed and successful railguns have been powered by homopolar generators, explosively driven magnetic flux compression generators, and capacitors. Each of these energy storage/generator devices is suitable for various railgun applications, but fo... View full abstract»

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  • Basic principles of coaxial launch technology

    Publication Year: 1984, Page(s):227 - 230
    Cited by:  Papers (59)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Coaxial launchers have received very much less attention than railguns because of their greater complexity, but they offer several significant advantages. They require no physical contact with the projectile, scale readily to very large diameter, can distribute thrust over the length of the projectile, have more adaptable energy supply and impedance requirements (being a multi-turn device), offer ... View full abstract»

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  • Analysis of helical brush commutation

    Publication Year: 1984, Page(s):231 - 234
    Cited by:  Papers (14)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Helical launchers are a logical candidate for launching large masses at intermediate velocities. Because of their simplicity and high efficiency it is worthwhile to consider their limitations in the higher velocity regime ( v > 1 km/sec) where the brush commutation process becomes of central importance. In an effort to establish these limits the physical principles of helical brush commutation ... View full abstract»

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  • Multistage induction mass accelerator

    Publication Year: 1984, Page(s):235 - 238
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    First Page of the Article
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  • Multiple stage pulsed induction acceleration

    Publication Year: 1984, Page(s):239 - 242
    Cited by:  Papers (24)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    Pulsed induction is an acceleration mechanism based on the repulsive force exerted on a conductor magnetically coupled with a pulse coil. Because this process is inductive no direct mechanical or electrical connection with the projectile is required. It has resulted in the highest acceleration ever achieved: 2 gram ring to 5 km/s in 1 cm length by Bondaletov, USSR. In principle this process can be... View full abstract»

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  • Current flow patterns in railgun rails

    Publication Year: 1984, Page(s):243 - 244
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    Using general considerations, it is shown that the current flowing near the armature in a railgun having thick rails must fan out quite steeply to flow on all surfaces of the rails, including their back faces. The effect this has on the computation of the force on the projectile is examined. The implications it has on system simulation is also discussed. View full abstract»

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  • Emack electromagnetic launcher commissioning

    Publication Year: 1984, Page(s):245 - 248
    Cited by:  Papers (18)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The EMACK laboratory demonstration electromagnetic launcher was designed and fabricated by the Westinghouse R&D Center and installed at the R&D Center for commissioning in late 1981. Subsequently, in February, 1982, a series of five test shots was made to commission the system and determine its operating characteristics. This paper summarizes the essential engineering details of the system... View full abstract»

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  • Mechanical design aspects of the HYVAX railgun

    Publication Year: 1984, Page(s):249 - 251
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The hypervelocity experiment (HYVAX) railgun (Fig. 1) is designed to produce projectile velocities greater than 15 km/s in a 13-m-long, round bore gun. The HYVAX gun incorporates a modular design enabling it to operate in either a distributed energy-storage mode or a single-stage mode. The gun is composed of seven O.3-m-long power input modules and nine 1.2-m-long accelerating modules. The gun is ... View full abstract»

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  • Design and testing of high-pressure railguns and projectiles

    Publication Year: 1984, Page(s):252 - 255
    Cited by:  Papers (7)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    The results of high-pressure tests of four railgun designs and four projectile types are presented. All tests were conducted at the Los Alamos explosive magnetic-flux compression facility in Ancho Canyon. The data suggest that the high-strength projectiles have lower resistance to acceleration than the low-strength projectiles, which expand against the bore during acceleration. The railguns were p... View full abstract»

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  • The DES raligun facility at CEM-UT

    Publication Year: 1984, Page(s):256 - 259
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    The Center for Electromechanics at The University of Texas at Austin (CEM-UT) has constructed a facility for the operation of electromagnetic (EM) launcher experiments. The facility was specifically designed to investigate distributed-energy-store (DES) railguns. Experiments conducted in the facility have demonstrated the DES railgun concept using a 1-m long, four-stage DES railgun. Investigations... View full abstract»

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  • Development of railgun accelerator combined with two-stage light gas gun

    Publication Year: 1984, Page(s):260 - 263
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The status of railgun development at T.I.T. is summarized. A Zm railgun combined with two-stage light gas gun has been developed for high pressure research. Further multi-acceleration experiments using two railguns connected in series are in preparation. The purpose of this experiment is to establish the techniques for multi-stage railgun. Computer simulations show that the segmented multi-stage r... View full abstract»

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  • Plasma puffing from a railgun armature

    Publication Year: 1984, Page(s):264 - 267
    Cited by:  Papers (12)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    A series of experiments has been conducted in which plasma has been allowed to escape from the armature of two railguns. This has enabled improved estimates of armature length to be obtained, as well as direct evidence of armature temperature. View full abstract»

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  • Efficiency equations of the railgun

    Publication Year: 1984, Page(s):268 - 271
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Efficiency of railguns will ultimately determine the scale of their use since it determines the size of the power source. Equations are derived for the losses and efficiencies of breech supplied, segmented and distributed energy store guns and evaluated for a 5 gram mass accelerated to 10 km/s under various conditions. Constant current is assumed. View full abstract»

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  • Distributed-current-feed and distributed-energy-store railguns

    Publication Year: 1984, Page(s):272 - 275
    Cited by:  Papers (14)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    Distributed-type railguns are combinations of power supplies and railguns designed to maintain a nearly constant current in the armature of a railgun and to overcome the accelerator length limitations of simple breech-fed railguns. This limitation arises from the increasing resistance and inductance of the rails with increasing railgun length. The energy efficiency of a railgun system from the pri... View full abstract»

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  • Performance results of a small-calibre electromagnetic launcher

    Publication Year: 1984, Page(s):276 - 279
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Results of electromagnetic launcher experiments are presented. Utilising an inductor and a crowbarred capacitor bank, 0.3 g projectiles have been accelerated over 800 mm to a velocity of 3.3 km/s. Muzzle and breech voltage curves are presented, as are tables of muzzle volts and efficiencies. View full abstract»

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  • Further development of plasma-armature railgun simulation codes at MRL

    Publication Year: 1984, Page(s):280 - 282
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    We present a critique of present railgun armature simulation codes and discuss the further development of such codes for railguns in the light of recent experimental findings. It is concluded that present models of the plasma are inadequate and that we require a model which is insensitive to the ion species making up the plasma, and which maintains constant plasma volume except for very low curren... View full abstract»

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Aims & Scope

IEEE Transactions on Magnetics publishes research in science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage.

Full Aims & Scope

Meet Our Editors

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