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Applied Superconductivity, IEEE Transactions on

Issue 4 • Date Dec. 2004

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Displaying Results 1 - 11 of 11
  • Table of contents

    Publication Year: 2004 , Page(s): c1
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  • IEEE Transactions on Applied Superconductivity publication information

    Publication Year: 2004 , Page(s): c2
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  • Trapped field and related properties in a superconducting-disk magnetized by pulse field

    Publication Year: 2004 , Page(s): 2025 - 2030
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (264 KB) |  | HTML iconHTML  

    The distributions of the magnetic field and temperature in a superconducting-disk magnetized by pulse field, and the levitation force between this disk and a permanent magnet are calculated. The calculation is based upon the current motion and the heat diffusion equations in the disk. The critical current density as a function of magnetic field and temperature is taken into account. The dissipation power in the superconducting or the normal state region is distinguished. The trapped field may reach 17 T at 29 K by pulsed field magnetization. The effects of the amplitude of the current pulse on the distributions of magnetic field in the disk and on the levitation force are discussed. View full abstract»

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  • Josephson latching driver with a low bit-error rate

    Publication Year: 2004 , Page(s): 2031 - 2036
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (480 KB) |  | HTML iconHTML  

    A new Josephson latching driver with a current-injection device at an input port has been developed and tested. It has high input sensitivity and a wide bias margin. Under an optimal bias condition, the bit-error rate (BER) of this driver is below 10-12 at data rates of 5 and 10 Gb/s. The driver can be switched by superconducting single-flux quantum (SFQ) pulse input and can be used as an amplifier to test the BER of SFQ circuits. In such a test, the BER of an SFQ converter operating at 5 Gb/s was less than 10-12 with bias margin of ±20%. View full abstract»

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  • Superconductivity: an emerging power-dense energy-efficient technology

    Publication Year: 2004 , Page(s): 2037 - 2046
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1048 KB) |  | HTML iconHTML  

    As the world becomes more "electrified," efficient distribution and use of electrical power becomes increasingly important. Loss of electrical energy due to resistance to current flow translates into wasted energy and wasted economic resources. Superconductivity offers zero (dc) to near zero (ac) resistance to electrical flow; thus, the use of superconducting materials can improve the overall electrical system efficiency while significantly reducing the size and weight of power components and machinery. Although superconductivity was first discovered in 1911, the requirement of an extreme cryogenic environment (near absolute zero temperature) limited its utility. With the discovery in 1986 of a new class of "high-temperature superconductors (HTS)" that operate at substantially higher temperatures (although still cryogenic), remarkable progress has been made in advancing a broader use for superconducting technology. Full-scale demonstrations are now permitting the development of engineering skills required for systems implementation and are quantifying system benefits of this new HTS technology. This article briefly reviews some of the fundamental attributes of superconductivity and discusses how they can benefit our electrical power system. The article then briefly describes some of the ongoing U.S. demonstration projects (transmission lines, transformers, motors/generators, etc.), showing the benefits of superconductivity. View full abstract»

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  • Hybrid photonic analog-to-digital conversion using superconducting electronics

    Publication Year: 2004 , Page(s): 2047 - 2052
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (240 KB) |  | HTML iconHTML  

    A hybrid analog-to-digital converter is described that uses photonic waveform sampling coupled with superconducting electronics for quantization and conversion to a binary format. The architecture scheme exploits extremely low clock jitter, amplitude stability, and a picosecond sampling aperture from the photonic system and magnetic flux quantization and high-speed digital logic in the superconducting system. The operational speed of the conversion is primarily limited by the maximum speed of the superconducting logic elements. View full abstract»

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  • Numerical analysis of high-temperature superconductors with the critical-state model

    Publication Year: 2004 , Page(s): 2053 - 2063
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1272 KB) |  | HTML iconHTML  

    A numerical method is proposed to analyze the electromagnetic behavior of systems that include high-temperature superconductors. The algorithm uses the finite-element method and the critical-state model, and it solves two-dimensional and axially symmetric problems that include superconductors and other materials. The main advantages of the algorithm are its speed, its robustness, and its ease of coupling with circuit equations. This method is used to analyze two different systems: 1) Magnet-superconductor levitation system-the levitation forces are calculated. In order to validate the model, experimental results of such a system are obtained and compared with simulation results. 2) Nine-wire superconducting cable. Parallel and series-type configurations of the current driven in the wires are analyzed. Hysteresis ac losses are also calculated and compared for both scenarios. View full abstract»

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  • Chaotic oscillations in Josephson tetrode

    Publication Year: 2004 , Page(s): 2064 - 2070
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (448 KB)  

    We numerically demonstrate the generation of chaos in a four-terminal superconductive device made of five Josephson weak-link junctions, which is referred to as "Josephson tetrode," for the applications of ultrafast random signal generations at frequencies of hundreds of gigahertz. In the Josephson tetrode, two junctions are series-connected and three junctions are parallel-connected. We calculate the dynamics of electrical voltages across the junctions when one of the normal resistances is varied. We confirm the generation of chaos by using a bifurcation diagram, three-dimensional attractors, and the Poincare sections. The bifurcation diagram can be interpreted as the quasi-periodicity-breakdown scenario to chaos. We clarify that the mechanism of the generation of chaos is a nonlinear frequency mixing among three independent voltages across the junctions. The condition of the generation of chaos can be predicted from the values of the coefficients in the equations of our model. View full abstract»

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  • 2004 Index

    Publication Year: 2004 , Page(s): 2071 - 2140
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  • Blank page [back cover]

    Publication Year: 2004 , Page(s): c3
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  • IEEE Transactions on Applied Superconductivity Information for authors

    Publication Year: 2004 , Page(s): c4
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Aims & Scope

IEEE Transactions on Applied Superconductivity contains articles on the applications of superconductivity and other relevant technology.

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Meet Our Editors

Editor-in-Chief
Britton L. T. Plourde
Syracuse University
bplourde@syr.edu
http://www.phy.syr.edu/~bplourde