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IEEE Transactions on Magnetics

Issue 3 • Date May 1983

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Displaying Results 1 - 25 of 322
  • [Front cover and table of contents]

    Publication Year: 1983, Page(s): 0
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    Freely Available from IEEE
  • Editorial

    Publication Year: 1983, Page(s):156 - 157
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    Freely Available from IEEE
  • Chairman's comments

    Publication Year: 1983, Page(s): 160
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    Freely Available from IEEE
  • Superconductivity research in the good old days

    Publication Year: 1983, Page(s):161 - 166
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (773 KB)

    First Page of the Article
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  • Status and trends of S.C. magnet development in Europe

    Publication Year: 1983, Page(s):167 - 178
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    Many applications of s.c. magnets have been proposed and considered during the last decade. They may be classified into three catagories: S.c. magnets as research tools in particle and solid state physics, in energy technology, and for various industrial applications. All these are still pursued in Europe but a considerable shift in effort to specific projects has occurred during the last decade. ... View full abstract»

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  • Superconducting magnet development in Japan

    Publication Year: 1983, Page(s):179 - 188
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    The present state of R & D works on the superconducting magnet and its applications in Japan are presented. On electrical rotating machines, 30 MVA superconducting synchronous rotary condenser (Mitsubishi and Fuji) and 50 MVA generator are under construction. Two ways of ship propulsion by superconducting magnets are developing. A superconducting magnetically levitated and linear motor propell... View full abstract»

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  • Status reports on ISABELLE magnets

    Publication Year: 1983, Page(s):189 - 194
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    The design of the ISABELLE "Palmer" magnets is described. The performance of thirteen such magnets is reported. Average quench fields of 55 kG at 4.5°K have been obtained with essentially no training. The magnets can be shown to be limited only by the short sample characteristics of the cable. Required field quality was achieved in the last four magnets. View full abstract»

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  • Status of the energy saver

    Publication Year: 1983, Page(s):195 - 197
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The one-TeV proton synchrotron which has been under construction at Fermilab is nearly complete and is now entering the commissioning phase. The assembly and testing of the ring of more than 1000 superconducting magnets with its associated cryogenic, vacuum, power, R.F., controls and safety systems has gone extremely well. View full abstract»

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  • Dipole magnet development in Japan

    Publication Year: 1983, Page(s):198 - 203
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    Recent development of superconducting accelerator dipole magnets in Japan is described. A series of NbTi/Cu dipoles in the region of 5 to 10 T is being developed at KEK. The maximum field will depend on the maximum proton energy of the TRISTAN ring from 300 to 600 GeV. On the other hand, development of a special Nb3Sn/Cu dipole magnet in the region of 10 T has been started for the futur... View full abstract»

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  • Mo base superconducting materials prepared by multi-target reactive sputtering

    Publication Year: 1983, Page(s):204 - 207
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    With an aim of developing new types of superconducting materials, Mo-N films and Mo/Si multi-layered films were fabricated by reactive and two-target sputtering methods, respectively. The superconducting properties such as Tc, Hc2and Jcwere examined. The crystal structure of Mo-N films changed from bcc to fcc with increasing N2gas flow rate during sputte... View full abstract»

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  • Effect of rapid quenching and with Carbon and Nitrogen on the structure and superconducting properties of the Nb3Ge compound

    Publication Year: 1983, Page(s):208 - 211
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The effect of rapid quenching and alloying with carbon and nitrogen on the superconducting properties of the Nb3Ge compound has been studied. The quantitative phase X-ray analysis of the studied specimens depending on the content of alloying components has been carried out. The temperature at which the transition into the superconducting state occurs as well the parameters of the alloy ... View full abstract»

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  • Quenches of formvar - coated NbTi/Cu caused by step input in power

    Publication Year: 1983, Page(s):212 - 215
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    We have investigated the stability of the composite Nb48Ti/Cu coated with a formvar layer (30 μm thick). Starting from thermal equilibrium in the superfluid liquid He II range below the lambda temperature (T = Tλ), the composite temperature is found to rise first monotonically with time t, upon onset of energy dissipation. However, restricted stability is visible as a relative... View full abstract»

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  • An attempt to reduce training using filled epoxy as an impregnating material

    Publication Year: 1983, Page(s):216 - 219
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    Selection of impregnating materials has been made in order to reduce training of superconducting magnets based on their mechanical and/or thermal properties. Race track shaped coils which are assumed to show marked training, are impregnated with several materials and energized. Epoxy resin filled with alumina powder is found to show superior behavior to those of wax or epoxy resin itself as an imp... View full abstract»

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  • Computer analysis of transient heat transfer from coated surfaces

    Publication Year: 1983, Page(s):220 - 223
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The transient thermal response of internally heated, coated surfaces in contact with liquid helium was investigated with a previously developed computer model. The coatings were found to affect the time required to initiate film boiling or to quench a superconductor in the substrate. The energy which can be absorbed without an unacceptably large temperature rise depends most strongly upon the coat... View full abstract»

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  • Nb3Sn-composite conductors with Aluminum as electrical stabilizer and stainless steel as mechanical reinforcement

    Publication Year: 1983, Page(s):224 - 227
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Three-component conductors composed of a preheat-treated Nb3Sn flat cable, aluminium, and stainless steel were soldered together in a straight alignment and then wound in a single-layer coil with a diameter of 90 mm. The performance of the composite conductor was determined mainly by the position of the steel, because the steel shifts the neutral plane considerably due to its high modul... View full abstract»

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  • Oxygen-free Copper at 4 K: Resistance and magnetoresistance

    Publication Year: 1983, Page(s):228 - 231
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    Oxygen-free copper is the most common material used for stabilizing practical superconductors. This type of copper may show residual resistance ratios (RRR) that vary from 50 to 700 in the full soft condition. Knowledge of the exact RRR value is often essential for optimum system design. We have investigated the effect of stress, temper, and reanneal on the RRR and magnetoresistance of several hun... View full abstract»

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  • Origination and oscillations of normal zone in superconductors

    Publication Year: 1983, Page(s):236 - 239
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Dynamics of normal (N) zone regions (resistive domains) in uniform and nonuniform superconductors has been investigated both theoretically and experimentally. An analytical theory has been proposed to describe the resistive domains (RD) dynamics in nonuniform superconductors with the alternating current. The origination and localization of RD have been considered. The self-exited relaxation oscill... View full abstract»

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  • Normal zone stationary distribution in superconducting composites with contact resistance

    Publication Year: 1983, Page(s):232 - 235
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    Heat and electrical contact resistances exist in composite superconductors between the normal metal and the superconductor in most cases. Frequently by some reasons these resistances are high enough. It is shown in this paper that in composite superconductors with noticeable contact resistance the existence of the resistive regions of finite size is possible. Such regions (resistive domains) are s... View full abstract»

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  • Current-carrying capacity of composite superconductors

    Publication Year: 1983, Page(s):240 - 243
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    The maximum transport current Imof the composite superconductors is investigated both theoretically and experimentally. It is shown that the high values of the transport current observed in these materials is due to the non-linear part of the current-voltage characteristic in the range of low electric fields ( E l\sim 10^{-6} Vcm-1). The... View full abstract»

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  • The effect of field orientation on current transfer in multifilamentary superconductors

    Publication Year: 1983, Page(s):244 - 247
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    Experimental data and discussion are presented on the current distribution along the length of a superconducting wire when subjected to multiple parallel and perpendicular magnetic fields. The experimental data were taken on a rectangular pancake coil with the applied magnetic field in the plane of the coil. These data indicate that significant current transfer occurs in the first and last perpend... View full abstract»

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  • A low loss NbTi multifilamentary composite conductor for A.C. use

    Publication Year: 1983, Page(s):248 - 251
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Investigations of a.c. losses and stability of a mixed-matrix NbTi multifilamentary conductor are presented. Fine filament size of 1.0 μm and a tight twist of 5.5 times the wire diameter 0.2 mm result in a time constant of the eddy current of 0.024 msec at 1.0 T. If this conductor is used in superconducting armature windings of rotating machines or in a.c. magnets, generating a maximum field ... View full abstract»

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  • Selffield losses and selffield stability of superconducting wires with low conductivity matrix material

    Publication Year: 1983, Page(s):252 - 255
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The influence of the normal material in a superconducting wire on the selffield losses has been investigated. The results show that the contribution of the normal material is considerable in the case of a highly conductive material like Cu. Measurements on wires with CuNi-material show no significant contribution of the normal material to the losses. In the latter case, however, special attention ... View full abstract»

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  • Reduction of A.C. losses by decrease of the surface barrier

    Publication Year: 1983, Page(s):256 - 260
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    We report on an extensive computational investigation of the effect of the surface barrier on hysteresis losses. These model calculations reveal that the losses can be substantially diminished by lowering the height of the surface barrier. The calculations were carried out for planar (ribbon) and for cylindrical (wire) geometry with the applied magnetic field directed along the surface(s) of the s... View full abstract»

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  • Extending an internally cooled superconducting magnet to higher fields

    Publication Year: 1983, Page(s):261 - 263
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    An internally cooled superconducting (ICS) magnet was built and tested earlier at Oak Ridge National Laboratory (ORNL), and its stability margin as a function of operating fields was measured at an ambient helium temperature of 4.2 K. In the experiment reported here, we retested this magnet with lower bulk helium temperatures. The stability margins of the magnet as a function of temperature were m... View full abstract»

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  • Conductor design for superfluid Helium II

    Publication Year: 1983, Page(s):264 - 267
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    This paper derives some design formulas and charts for a high-field (12 Tesla) application using Nb43Ti25Ta alloy superconductor. This material is selected because of its large critical current (Jc= 71,000 A/cm2) at 12 Tesla and 1.8K. Its ductility is beneficial to manufacturing processes and accommodating of the operating condition under stress. A coil packing factor of 70% ... 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