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Proceedings of the IEEE

Issue 1 • Jan. 1973

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Displaying Results 1 - 25 of 39
  • [Front cover and table of contents]

    Publication Year: 1973, Page(s): c1
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  • What's new in the proceedings?

    Publication Year: 1973, Page(s): 4
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  • John Bardeen: 1972 nobel laureate in physics

    Publication Year: 1973, Page(s): 5
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  • Scanning the issue

    Publication Year: 1973, Page(s):6 - 7
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  • Low-frequency applications of superconducting quantum interference devices

    Publication Year: 1973, Page(s):8 - 19
    Cited by:  Papers (50)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1318 KB)

    The applications of Josephson junctions to the measurement of low-frequency magnetic fields and voltages are reviewed. The relevant ideas of flux quantization and Josephson tunneling are very briefly reviewed, and the various methods of making Josephson junctions mentioned. The two basic types of magnetic sensor, the dc superconducting quantum interference device (SQUID) and the RF SQUID, are desc... View full abstract»

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  • Superconducting instrument systems

    Publication Year: 1973, Page(s):20 - 27
    Cited by:  Papers (32)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1473 KB)

    Some recently developed superconducting instrument systems which are based upon the use of a highly reliable thin-film superconducting quantum interference device (SQUID) are discussed in detail. These SQUID's, which are shown to have a noise temperature of less than 2 × 10-4K, are capable of measuring: 1) magnetic flux with a sensitivity of 10-11Gċcm2rms... View full abstract»

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  • The flux shuttle—A Josephson junction shift register employing single flux quanta

    Publication Year: 1973, Page(s):28 - 35
    Cited by:  Papers (29)  |  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (747 KB)

    A shift register is described which employs as information bits the flux quantum vortices occurring in Josephson junctions of extended dimensions. The positions of the vortices can be controlled and manipulated by an appropriately designed circuit geometry and by application of currents and magnetic fields. The time required for switching of the position of a vortex can approach the period of the ... View full abstract»

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  • Millimeter and submillimeter wave detection and mixing with superconducting weak links

    Publication Year: 1973, Page(s):36 - 45
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1013 KB)

    A weak link between two bulk superconductors can exhibit Josephson effects and can be used as a fast sensitive detector or mixer for electromagnetic radiation. Emphasis is placed on the millimeter and submillimeter range where such applications are potentially most important, though such devices should also work well at lower frequencies. The peculiar properties of the weak link make possible a va... View full abstract»

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  • Analog-computer studies on microwave mixing in superconducting weak links

    Publication Year: 1973, Page(s):46 - 50
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (459 KB)

    The dc characteristics of superconducting weak links, irradiated by one and two microwave frequencies and the dependence of the absorbed microwave power on the dc current, are evaluated. Within the constant voltage steps, the ac current generated in the weak link is synchronous with the incident microwaves or their mixing products. In the case of two incident microwave frequencies within the const... View full abstract»

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  • Josephson junction millimeter microwave source and homodyne detector

    Publication Year: 1973, Page(s):51 - 54
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (407 KB)

    A millimeter and submillimeter microwave source is described in which a point-contact Josephson junction is used as both the emitter and as a homodyne detector of the microwave radiation. The microwave radiation is conveyed from the Josephson junction to the room-temperature environment outside the Dewar of liquid helium by an oversize waveguide. A room-temperature Fabry-Perot resonator refocuses ... View full abstract»

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  • Comparative studies of noise limitations in superconducting thin-film radiation detectors

    Publication Year: 1973, Page(s):55 - 58
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    We report measurements on the noise limitations of superconducting thin films operating as thermal detectors (bolometers) and as current-dependent detectors. By making measurements in each mode on the same film it is possible to make a comparative study of the noise limitations for both detection mechanisms in the same device. Thin tin films with normal state sheet resistances on the order of 100 ... View full abstract»

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  • Superconducting resonators and devices

    Publication Year: 1973, Page(s):58 - 70
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1354 KB)

    The high-frequency properties of superconductors are reviewed, including the London, Pippard, and Mattis-Bardeen surface impedance, and techniques for measuring and separating losses are discussed. Residual resistance mechanisms are described and evaluated, including high field effects. The state of knowledge is shown to be adequate for engineering design. Applications of superconducting resonator... View full abstract»

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  • Superconducting lead cavities at 35 GHz

    Publication Year: 1973, Page(s):71 - 76
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (727 KB)

    An investigation of machined superconducting lead cavities operating in the circular cylindrical TE011mode at 34.8 GHz is reported. Measured values of the surface resistance and the shift of the resonance frequency are presented and compared with calculated values. Construction criteria for high-Q cavities are proposed, based on a discussion of the different loss mechanisms in a cavity.... View full abstract»

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  • Miniature superconductive coaxial transmission lines

    Publication Year: 1973, Page(s):76 - 79
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (419 KB)

    This is a review paper concisely tracing the development of miniature superconductive coaxial transmission lines from the original invention as a vertical channel signal delay line for fractional nanosecond pulse oscillography to present-day work towards highly compact, broad-band, and low-loss telecommunication cables. The present state of development yields a 1.6-mm coaxial line operating at 4.2... View full abstract»

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  • Weakly superconducting circuits

    Publication Year: 1973, Page(s):79 - 84
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (690 KB)

    An equivalent circuit has been developed for the time-dependent dissipating state of superconductivity which accompanies quantum phase slip. This equivalent circuit is used here to analyze the superconducting thin-film ring magnetometer and to determine its operating characteristics in terms of measurable circuit parameters. View full abstract»

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  • Large-scale applications of superconducting coils

    Publication Year: 1973, Page(s):85 - 95
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1617 KB)

    Superconducting coils have been utilized in a broad range of applications which continues to expand. Initially, they were used for small physics experiments in the laboratory. More recent applications involve superconducting coils on a scale that would have been unrealistic only a few years ago. This paper is concerned with some of these applications. After a brief review of the main characteristi... View full abstract»

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  • Superconducting electrical machinery

    Publication Year: 1973, Page(s):95 - 105
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1418 KB)

    Recent developments in superconductors have made possible the application of superconductivity in the windings of electric machinery. Extensive studies have been made, and several experimental superconducting machines have been built and tested. In synchronous machines, the higher currents and flux densities in a superconducting field winding offer savings in size, weight, and cost. In homopolar m... View full abstract»

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  • Development of superconducting DC machines at international research & development Co., Ltd.

    Publication Year: 1973, Page(s):106 - 111
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (829 KB)

    The entire program of the development of superconducting dc machines at International Research & Development Co., Ltd. (IRD) from 1963 onwards is covered. The early thinking on the choice of the type of machine and the reasons for selecting the homopolar are described; the first 50-hp model motor and the 3250- hp Fawley motor are then discussed. A brief account is given of the testing of the l... View full abstract»

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  • MIT-EEI program on large superconducting machines

    Publication Year: 1973, Page(s):112 - 115
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (634 KB)

    A progress report on the program at MIT to demonstrate the feasibility and potentials for the application of superconductors in the rotating field windings of large central station synchronous generators is presented. A brief history of the program and a synopsis of previously reported results are given. The second ex-experimental machine (which will have a rating of about 2 MVA) is described. View full abstract»

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  • A new technique for RF measurements using superconductors

    Publication Year: 1973, Page(s):121 - 122
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    The quantization of magnetic flux in a superconducting circuit can serve for the measurement of electrical quantities in the same way that we use the wavelength of light to measure length. We report a demonstration of this function in the measurement of attenuation ratio at a frequency of 30 MHz. View full abstract»

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  • A superconductive tuner with broad tuning range

    Publication Year: 1973, Page(s):122 - 123
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (257 KB)

    The tuner discussed in this letter is a superconductive, tunable, parallel LC resonant circuit. The inductance and capacitance are varied simultaneously. A tuning range of 17:1 in frequency has been achieved within a single band. Bandwidth can be controlled by coupling control. Q's in excess of 105were measured. View full abstract»

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  • Attainment of a low-noise high-power and highly stable Gunn oscillator by coupling to a superconducting cavity

    Publication Year: 1973, Page(s):123 - 124
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    A 100-mW Gunn-diode oscillator has been coupled to a 5 × 108Q factor superconducting Nb cavity. The frequency stability is then improved up to 1.8 × 10-11over a measuring time of 10s. The long-term frequency shift is removed by placing the cavity in a constant pressure vessel cooled by the He bath. The FM noise has been measured at modulating frequencies as close to... View full abstract»

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  • Frequency characteristics of superconductive coaxial lines

    Publication Year: 1973, Page(s):124 - 125
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (245 KB)

    By precise manufacturing methods, 1.6-mm 50-Ω superconductive coaxial lines having few impedance irregularities (0.2 to 0.3 Ω) have been produced. Their attenuation constant at 4.2 K shows a smooth gradual increase upto 12.4 GHz in proportion to frequency. The loss at 1 GHz is 0.7 dB/km for the line using tetra fluoroethylene-hexa fluoropropylene (FEP) and 1.6 dB/km for the line using po... View full abstract»

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  • Design and application of a programmable pulse distributor

    Publication Year: 1973, Page(s):125 - 127
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (310 KB)

    The unit distance property of the Gray code can be used in pulse distributor circuits which are hazard-free. A modified synchronous Gray-code counter is used as the basis of a programmable pulse distributor described in this letter. The complete circuit is iterative in its interconnection pattern and therefore can be extended easily. A possible application of this type of pulse distributors, as a ... View full abstract»

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  • A clarification on bus-cut diakoptics

    Publication Year: 1973, Page(s):127 - 129
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The brevity required in the paper by Sasson and Brown (A. M. Sasson and H. E. Brown, "Deductions and clarifications on the diakoptics approach," in 1971 7th PICA Conf. Proc., pp. 433-439) obscures a computational aspect important to the tutorial and application value of their "bus-cut" method. A numerical example is presented here to help clarify this computation. View full abstract»

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