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Magnetics, IEEE Transactions on

Issue 2 • Date March 1975

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Displaying Results 1 - 25 of 204
  • [Front cover and table of contents]

    Publication Year: 1975 , Page(s): 0
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  • Editor's comments

    Publication Year: 1975 , Page(s): 93
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    Freely Available from IEEE
  • Chairman's comments

    Publication Year: 1975 , Page(s): 94
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    Freely Available from IEEE
  • Energy R&D policy - Issues and choices

    Publication Year: 1975 , Page(s): 98 - 100
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  • Energy legislation in the 93rd congress--Programs and personalities

    Publication Year: 1975 , Page(s): 95 - 97
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    A review is given of energy legislation activities of the 93rd Congress, particularly since the Arab oil embargo, with attention mainly to energy provision technologies R&D - program goals and management organization. Relations are pointed out between Congressional actions on the one hand and Congressional committee jurisdication and personalities on the other. The relevance of this legislation for a particular technology, superconductive electrical transmission, is pointed out. View full abstract»

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  • Superconductivity - A subject of interest to the atomic energy commission

    Publication Year: 1975 , Page(s): 101 - 104
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  • Helium supply and demand in future years

    Publication Year: 1975 , Page(s): 109 - 112
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  • The electric power research institute's role in applying superconductivity to future utility systems

    Publication Year: 1975 , Page(s): 105 - 108
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    Economics has been the single most important factor in determining the future of any new commercial technology in the United States. This criterion is in need of serious examination in view of the projected sharply increasing consumption of energy in the next few decades, particularly in the form of electricity. In order to make a smooth and meaningful transition from conventional methods of generating and transmitting electricity, a coordinated effort between all segments of the private and public domains will be required. The Electric Power Research Institute (EPRI) should play a vital role in planning for both the imminent short term, and long term national electrical energy needs; and in coordinating efforts to achieve these vital goals. If, as predicted, the U. S. power consumption increases by more than a factor of six in the next 30 years, it should be clear that it is necessary to develop high power density methods of producing and transmitting electricity. Superconductivity is the natural prime candidate for a new feasible technology that can take on this responsibility. View full abstract»

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  • Superconductivity applications in high energy physics

    Publication Year: 1975 , Page(s): 113 - 118
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    During the past five years, several very large superconducting bubble chamber and spark chamber magnets have become operational. The economic and other factors which have led to the construction of large superconducting solenoid magnets for high energy physics research are discussed, and the technological development which made these magnets possible is summarized. Much of the recent development work on superconducting magnets for high energy physics has been directed toward the next generation of accelerators and beam storage rings. Here the goal is to develop dipole and quadrupole magnets of high field precision, low cost, high reliability, capability for slow pulsing, and minimal sensitivity to radiation heating. The status of this work and its application to future accelerators is described. Also, the application of superconducting rf cavities for linear accelerators and particle separation is reviewed briefly. View full abstract»

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  • Role of superconducting transmission - A subjective assessment

    Publication Year: 1975 , Page(s): 125 - 127
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  • Superconducting materials up to now and into the future

    Publication Year: 1975 , Page(s): 119 - 124
    Cited by:  Papers (2)
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    "Tool maker, stacker of wheat.. Flinging magnetic curses amid the toil of piling job upon job." Anybody who has had a magnet quench on him knows what Carl Sandburg meant when he wrote of Chicago. The question before all of us today is: Can we lick the magnetic curses and really apply superconductivity? Certainly the wider the range of properties that superconductors have the more chance there is of success. The first portion of the paper will be concerned with the range of intrinsic properties: the critical temperatures (Tc), critical fields (Hc), and critical currents (Jc) In the latter part we will discuss the fabrication of superconducting materials into composite wires or cables in forms suitable for producing magnets, generators, transmission lines, and some of the other devices that are the subject of this meeting. Structures concerned with nonpower-related applications such as Josephson junction devices unfortunately are beyond the present scope. View full abstract»

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  • Superconducting rotating machines

    Publication Year: 1975 , Page(s): 128 - 134
    Cited by:  Papers (3)
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    The opportunities and limitations of the applications of superconductors in rotating electric machines are given. The relevant properties of superconductors and the fundamental requirements for rotating electric machines are discussed. The current state-of-the-art of superconducting machines is reviewed. Key problems, future developments and the long range potential of superconducting machines are assessed. View full abstract»

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  • Application of superconductivity in the controlled thermonuclear research program

    Publication Year: 1975 , Page(s): 135 - 140
    Cited by:  Papers (1)
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    Applications of superconductivity will be needed in each of the three magnetic confinement systems being developed in the AEC controlled thermonuclear research program. Fusion plasmas must be confined by magnetic fields instead of solid walls. The tokamak and magnetic mirror confinement systems will need superconducting magnets to produce the confining magnetic field. The theta-pinch confinement system will need superconducting energy storage coils and homopolar machines to provide energy for pulsed magnetic fields. The AEC is supporting developments for these three systems but it is not yet known which magnetic confinement systems will be used in fusion power reactors. The technology problems associated with these applications of superconductivity are described in the paper. View full abstract»

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  • Review of superconducting electronics

    Publication Year: 1975 , Page(s): 141 - 146
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    This review will sketch the present state of affairs in applications of Josephson junctions and SQUIDs to: magnetometry, DC and RF metrology, detection and amplification of electromagnetic signals, frequency metrology, noise thermometry and computers. It will also mention recent progress in super-stable oscillators using superconducting resonant circuits, pulse transmission lines, and thin-film deviees to detect radiation or charged particles. Many of these topics are maturing nicely. View full abstract»

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  • Research work on superconducting magnet systems in Germany

    Publication Year: 1975 , Page(s): 147 - 153
    Cited by:  Patents (1)
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    Various applications of sc magnets are pursued in our country. Development in nuclear physics, especially new developments for dc and pulsed superconducting beam line magnets are reported. Research work on magnets for plasma and fusion physics concentrates on systems studies, toroidal systems, and energy storage devices and will become one of the most challenging fields for magnet builders in the future. Industrial applications of sc magnets are investigated for high speed transportation systems, sc machinery and magnetic separation devices. Programs and results are discussed. View full abstract»

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  • New superconducting critical temperatures and fields

    Publication Year: 1975 , Page(s): 154
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  • High field properties of ternary metal-molybdenum-sulfides

    Publication Year: 1975 , Page(s): 155 - 158
    Cited by:  Papers (2)
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    Measurements of the upper critical fields are presented for ternary metal-molybdenum-sulfides as a function of temperature, T, with dc magnetic fields up to ∼215kG and pulsed fields to ∼500kG. A nearly linear variation of HC2versus T is observed up to the highest dc fields for all the compounds. The materials (nominal composition), Tc(measured); (dH_{C2}/dT)_{T=T_{c}} (measured), and HC2(4.2 K) (calculated) for a dirty type II superconductor assuming no paramagnetic limiting are respectively: (a) Pb0.9Mo5.1S6: 11.7 K, 60 kG/K, 390 kG; (b) SnAl0.5Mo4.5S6: 14.2 K, 32 kG/K; 275 kG; (c) SnMo5S6:13.4K, 37kG/K; 290 kG; (d) PbMo5.1S6: 14.4, 60kG/K, 515kG. Pulsed field measurements yield HC2(4.2 K) = 390 kG for (a), 275 kG for (b), 290 kG for (c), and ≃510kG for (d). The PbMo5.1S6has the highest value of HC2measured to date. View full abstract»

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  • Improved superconducting properties of multifilamentary niobium carbonitride wire

    Publication Year: 1975 , Page(s): 159 - 162
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    Transport and magnetization measurements have been made on 6μ, 720 filament niobium carbonitride yarn. The magnetization data is discussed in terms of the hysteretic loss, the temperature dependence of Jc, the matrix-superconductor bond quality and the doping effects on the high field Jc's. Transport properties are compared to properties obtained from magnetization data. In addition, weak coupling has been investigated in low conversion fibers. The V-I curves show numerous voltage steps, some corresponding to an order of magnitude increase in resistivity. View full abstract»

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  • Neutron induced disorder in superconducting A-15 compounds

    Publication Year: 1975 , Page(s): 163 - 165
    Cited by:  Papers (1)
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    The effect of high energy neutron (E>1 MeV) irradiation at 60°C on the superconducting critical temperature, Tc, the upper critical field, Hc2, the lattice parameter, ao, and the degree of Long Range Order has been measured for Nb and V based A-IS superconducting compounds. Large reductions in Tc, and Hc2are observed for fluences up to 5.0 × 1019n/cm2. For Nb3Al aoincreases and the degree of Long Range Order is significantly reduced as Tcis depressed. The results are discussed in terms of atomic ordering in the A-15 structure. View full abstract»

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  • Neutron irradiation of Nb3Sn and NbTi multifilamentary composites

    Publication Year: 1975 , Page(s): 166 - 169
    Cited by:  Papers (3)
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    NbTi and Nb3Sn multifilamentary composites have been irradiated with fast-neutrons at 60 ± 5°C to fluences of 1.2×1020n/cm2(E > 1 MeV). The NbTi samples show only a moderate reduction of Icas a function of neutron fluence in an applied field of 40 kG. Reductions in Icwere observed for fluences greater than 3 × 1017n/cm2and saturate at 18% for fluences greater than 3-4 × 1019n/cm2. The Nb3Sn composites showed large neutron radiation induced changes in Tc, Icand Hc2. Reductions in Tcwere observed for fluences greater than 7 × 1017n/cm2. No measurable changes in Ic(40 kG) were observed below 1018n/cm2. Between 2 and 3×1018n/cm2, however, there is an apparent threshold where a very rapid reduction in Ic(40 kG) is initiated. At the threshold the decrease in Tcis 13%. Between the threshold and 1.1 × 1019n/cm2, I2(40 kG) has been reduced to 4% of the unirradiated value. These changes in superconducting properties in NbTi and Nb3Sn are analyzed in terms of the radiation induced defects. The impact of the response to irradiation of both materials on their applications in fusion reactor magnets is discussed. View full abstract»

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  • Effects of fast neutron irradiation at low temperature on the properties of Nb-Ti superconductor wires

    Publication Year: 1975 , Page(s): 170 - 173
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    The object of this work was to estimate the effects of neutron irradiation at 77K on commercial stabilized superconductor wires. Irradiation doses of 1018to 1019fast neutrons per cm2were explored and the critical current measured in magnetic fields extending from 2 to 8 Teslas. A reduction in the critical Current density, depending on the type of the conductor was observed and for the single core wire a decrease of the take off voltage indicates a loss of stability. View full abstract»

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  • Irradiation and annealing effects of deuteron irradiated NbTi and V3Ga multifilamentary composite wires at low temperature

    Publication Year: 1975 , Page(s): 174 - 177
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    To study the effects of low temperature irradiation on technological type II-superconductors, NbTi and V3Ga multifilamentary composite wires, the critical current Icand the transition temperature Tcwere measured before and after irradiation with 50 MeV deuterons at 10 K and 15 K, respectively. While the irradiation effects on Icand Tcof NbTi are substantially unaffected, the V3Ga wires undergo a reduction in Icof about 50 % and Tcdecreases from 14.7 ± 0.1 K to 12.3 ± 0.1 K at a total deuteron flux of 2.7 × 1017cm-2. Annealing experiments at room temperature and 100° C show only a small recovery of the superconducting properties up to 15 %. The field dependence of the volume pinning force densities Pvwas determined and the results are shown to be consistent with a qualitative dynamic pinning model. View full abstract»

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  • The influence of low temperature neutron irradiation on superconducting magnet systems for fusion reactors

    Publication Year: 1975 , Page(s): 178 - 181
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    The components (insulation, stabilization material and the superconductor) of a superconducting coil system for a fusion reactor are exposed to fast neutrons, probably with a dose of about 1018n/cm2during the lifetime of a reactor, and with an energy spectrum comparable with the one of a fission reactor. Experimental investigations were made on the influence of low temperature neutron irradiation on the stability of a superconductor and of the superconducting properties of NbTi wires with different initial jc and pre-treatment. The influence on jcand Tcof Nb3Sn was investigated. View full abstract»

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  • Preparation and properties of multifilament niobium carbonitride superconductor

    Publication Year: 1975 , Page(s): 182 - 184
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    The preparation and characterization of a multifilament niobium carbonitride yarn is reported here for the first time. The fine diameter multifilament yarn was prepared by chemical conversion of a precursor carbon yarn. The fibers are generally composed of both NbC and NbCN phases and exhibit a Tcof 16-17.5°K and an Hc2of 110- 120kG. Icvalues at zero field of up to 130 amperes have been measured corresponding to a Jcof 106A/cm2. Icis proportional to the amount of superconductor phase present as judged by weight gain data. At low conversion levels an anomaly has been detected in critical current behavior of the fibers suggesting a non-continuous superconducting path. Electrical contact to the fibers by copper coating is discussed showing the importance of obtaining a low resistance contact. Jcwas measured as a function of magnetic field for both the pure material and samples doped with silicon using SiCl4. The silicon dopant was found to be effective in reducing the field dependence of the critical current. View full abstract»

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  • Superconducting properties of thin film niobium carbonitrides on carbon fibers

    Publication Year: 1975 , Page(s): 185 - 188
    Cited by:  Papers (1)  |  Patents (1)
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    The characteristics of a new superconducting wire material, consisting of a 7 μm carbon filament substrate thinly coated with niobium carbonitride, are reported. These filaments are coated (∼ 1000 at a time as a yarn) by a co-CVD process in which the desired carbonitride is deposited as a compound. Several coating compositions from NbC to NbC.75N.15have been studied. At each composition several coating thicknesses from 300 to 3000 Å were prepared. Although our present coating compositions are not near NbC0.3N0.7, which has previously been determined as optimum for this pseudobinary system, we nevertheless have obtained excellent superconducting properties. Zero-field critical current densities of 2 × 106A/cm2in the coating have been obtained, and there is no discernable ac loss at frequencies up to 50 kHz. In addition to the superconducting measurements we have also performed chemical, x-ray diffraction, and electron microscopic analyses on the coated filaments. 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.

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