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Applied Superconductivity, IEEE Transactions on

Issue 4 • Date Dec. 2005

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Displaying Results 1 - 12 of 12
  • Table of contents

    Page(s): c1
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  • IEEE Transactions on Applied Superconductivity publication information

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  • A reliable molding technique by using epoxy-based resin for thin-film superconducting quantum interference devices

    Page(s): 3901 - 3905
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (688 KB) |  | HTML iconHTML  

    A reliable package is necessary for superconducting devices fabricated with thin films and wirebonds to maintain stable operation and good performance of the devices. In particular, prevention of wirebond disconnection due to thermal cycles is very important. We have developed a reliable epoxy resin and molding technique, which works as a stable package at extremely low temperature. Using this resin to package low-Tc superconducting quantum interference devices (SQUIDs) with aluminum and niobium wirebonds, so far 94.2% of more than 1500 SQUIDs have shown no disconnection of wirebond after ten thermal cycles at 77 K plus once at 4.2 K. We also confirmed that this resin does not generate any magnetic noise and a SQUID can be detrapped with a magnetic flux through thermal conduction from a resistor packaged together with the SQUID. View full abstract»

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  • Quench and recovery characteristics of HTS tapes under oscillating over-currents with different frequencies

    Page(s): 3906 - 3910
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (800 KB) |  | HTML iconHTML  

    Quench and recovery characteristics of Bi-2223/Ag high-temperature superconductor (HTS) tapes under oscillating over-currents with different frequencies have been observed. The experiment is carried out using an oscillating circuit consisted of capacitance and inductance, which produces oscillating currents with different frequencies. The HTS tapes are immersed in liquid nitrogen bath. The frequencies of the oscillating currents fed to HTS tapes are 180.8, 333.3, 434.8, 751.9, and 2016.1 Hz, respectively. In order to confirm the critical current of the tapes, dc current is fed to the tapes first. The magnitude of the oscillating currents is from a small current to 179 A, which is 2.5 times larger than the dc critical current of the tapes. The experimental result shows that the normal voltage generated by the over-current disappears fast after the end of the oscillating over-current, which shows that HTS tapes have good superconducting-to-normal conducting recovery characteristics under oscillating current with high frequency. The experimental results will encourage the possibility of the important applications of HTS tapes in pulsed power. View full abstract»

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  • High-temperature operation of oxide SFQ-circuit-elements

    Page(s): 3911 - 3916
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (896 KB) |  | HTML iconHTML  

    Single flux quantum (SFQ) circuit components such as an SFQ-dc converter and a confluence buffer have been fabricated by using an YBa2Cu3O7-δ ramp-edge junction technology and their logic operations at temperatures up to near 60 K were investigated. The SFQ-dc converter was correctly operated in a wide temperature range from 4.2 K to 56 K and found to be useful for detecting output signals from other SFQ circuit components at any operating temperatures. The basic function that a signal from either of two input Josephson transmission lines (JTLs) was transmitted to an output JTL was confirmed for the confluence buffer and finite operating margins were obtained at temperatures from 42 K to 61 K. The narrowest margin of dc supply current obtained at temperatures from 55 K to 60 K was ±20% and was consistent with the simulation. Margin reduction due to thermal noise was also evaluated. According to the analytical calculation, the operating margin to keep the bit-error rate less than 10-5 was as large as ±20% even at 50 K when the value of junction critical-current Ic was kept near 0.4 mA. View full abstract»

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  • Feasibility of electric power transmission by DC superconducting cables

    Page(s): 3917 - 3926
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB) |  | HTML iconHTML  

    The electrical characteristics of dc superconducting cables of two power ratings were studied: 3 GW and 500 MW. Two designs were considered for each of the two power ratings. In the first design, the SUPPLY stream of the cryogen is surrounded by the high-voltage high-temperature superconductor cylinder. The RETURN stream of the cryogen is on the grounded side of the system. In the second design, both the SUPPLY and the RETURN streams of the cryogen are on the grounded side of the cable. Two electrical characteristics of these cables were studied: 1) fault currents and 2) current harmonics. It was concluded that neither the fault currents nor the current harmonics pose any problems in the operation of the dc superconducting cables. View full abstract»

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  • Realization of four transmission zeros in a four-pole superconducting microstrip filter using cross-shaped spiral resonators

    Page(s): 3927 - 3931
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (376 KB) |  | HTML iconHTML  

    The realization of four finite transmission zeros with high-temperature superconducting microstrip narrow-band bandpass filter using four cross-shaped spiral resonators is described for the fully canonical case. The approach is based on the "N+2" transversal coupling matrix, which is composed of main direct coupling as well as source/load coupling. The filter, with 0.75% bandwidth, 3.25 MHz, at 408-MHz band, is to be used for a radio astronomy application at Jodrell Bank Observatory, U.K. The measured results match well with both theoretical results and simulated results, except for a small center frequency offset. View full abstract»

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  • Explore IEL IEEE's most comprehensive resource

    Page(s): 3932
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  • 2005 Index

    Page(s): 3933 - 4067
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  • IEEE order form for reprints

    Page(s): 4068
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  • IEEE Transactions on Applied Superconductivity upcoming special conference issues

    Page(s): c3
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  • IEEE Transactions on Applied Superconductivity Information for authors

    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