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Applied Superconductivity, IEEE Transactions on

Issue 2 • Date June 2006

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Displaying Results 1 - 25 of 451
  • [Front cover]

    Publication Year: 2006 , Page(s): c1
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  • IEEE Transactions on Applied Superconductivity publication information

    Publication Year: 2006 , Page(s): c2
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  • Table of contents

    Publication Year: 2006 , Page(s): 61 - 76
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  • MT-19 Chairpersons' Foreword

    Publication Year: 2006 , Page(s): 77
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  • Message from the Chairperson of the Editorial Board

    Publication Year: 2006 , Page(s): 78
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  • Obituary for Jean-Claude Lottin and Maurizio Spadoni

    Publication Year: 2006 , Page(s): 79
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  • MT-19 Committees

    Publication Year: 2006 , Page(s): 80
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  • Main sponsors

    Publication Year: 2006 , Page(s): 81
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  • Exhibitors List

    Publication Year: 2006 , Page(s): 82 - 83
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  • Group photo

    Publication Year: 2006 , Page(s): 84
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  • AC Loss Characteristics of YBCO Coated Conductors With Varying Magnitude of Critical Current

    Publication Year: 2006 , Page(s): 85 - 88
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (267 KB)  

    Three YBCO coated conductors with various critical currents, up to 189 A, were prepared. The magnetization losses without transport current and the total AC losses of the conductors carrying various transport currents in transverse magnetic fields with various orientations were measured electromagnetically to study the AC loss characteristics systematically. The measured total AC losses were compared with the numerical values using a one-dimensional FEM model View full abstract»

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  • AC Transport Current Loss Characteristics of REBCO Coated Conductors Subjected to Bending Strains

    Publication Year: 2006 , Page(s): 89 - 92
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (283 KB)  

    We experimentally investigated dependence of AC transport current loss characteristics of HoBCO on bending strains. The losses were compared with the losses in the straight conductors. The measurement results showed that values of the AC losses were affected by the bending strains. However, when the losses and the amplitudes of the transport currents were normalized by the strain dependent critical current, curves of the losses vs. the amplitude of the currents fell into one curve unless superconducting layers of the conductors get damages caused by bending strains. Based on these results, it can be considered that the AC transport current loss characteristics of HoBCO subjected to bending strain can be estimated by knowing values of critical currents of bent conductors and the loss characteristics of straight ones in the range where the bending strains do not damage the superconductor layers View full abstract»

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  • AC Losses in YBCO Coated Conductors Subjected to Tensile Stress

    Publication Year: 2006 , Page(s): 93 - 96
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (261 KB)  

    Stress dependencies of AC transport current losses, magnetization losses and total losses were investigated applying tensile stresses to an YBCO (IBAD/PLD) conductor. Measured transport current losses showed slight stress dependence in the range of 0~1 GPa. That can be explained by stress dependence of the critical current of the conductor. The magnetization and total losses are less sensitive to the stress than the transport current losses View full abstract»

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  • Numerical Evaluation of Total AC Loss in Parallel Tape Conductor With Transport Current in Oblique Magnetic Field

    Publication Year: 2006 , Page(s): 97 - 100
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    We numerically calculate AC losses in a three-strand parallel tape conductor with optimum transposition by means of the finite-element method that directly analyzes the magnetic field distribution. The parallel conductor carries an alternating transport current, whose amplitude is 70% of the critical current, in an in-phase external AC magnetic field that has an arbitrary angle to the flat face of Bi-2223 tapes. It is confirmed that the AC losses in the range of very small and large field amplitude are almost equal to those in cases of applying only a transport current to the parallel conductor and only an external magnetic field to a single Bi-2223 tape, respectively. However it is found that the AC losses are affected by the interaction among the transport current, external magnetic field, and strand number in the range around the full penetration field. Our proposed finite-element analysis helps us to evaluate the AC loss generated in such the middle range of field amplitude quantitatively View full abstract»

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  • Mechanical Losses Due to Frictional Heat in Bi-2223 Tapes With Structural Materials of Various Thermal Expansion Properties

    Publication Year: 2006 , Page(s): 101 - 104
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (252 KB)  

    We have experimentally studied relation between mechanical losses and thermal expansion properties in superconducting coils. For the experiments, three kinds of structural materials (GFRP, DGFRP, and ZFRP) were used. A glass fiber reinforced plastic (GFRP) contracts with decreasing temperature; on the contrary, a Dyneema and grass fiber reinforced plastic (DGFRP) and a Zylon fiber reinforced plastic (ZFRP) expand with the decrease of temperature. We used sample holders made of those plastics and measured AC current losses of a Bi-2223 tape in liquid nitrogen. Even if the magnetic field applied to the tape and an AC transport current of the tape were same, the loss depended on the sample holder materials. When the sample holder is the GFRP, the loss was largest in the three kinds of plastics, and in case of the ZFRP, the loss was smallest. The ZFRP has the largest expansion property of the three materials, that is, the loss decreased with expansion of the sample holder's materials View full abstract»

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  • The Nitrogen Boil-Off Method for Measuring AC Losses in HTS Coils

    Publication Year: 2006 , Page(s): 105 - 107
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (383 KB)  

    We have developed a novel apparatus for applying a nitrogen boil-off method as a mean of making calorimetric measurements and allowing for simple measuring and evaluating of AC losses in HTS coils at liquid nitrogen temperature. With the ability to measure AC loss generated in superconductors directly, this method produces more reliable data than that obtained by general, electro-magnetic measurements. A sensitivity of about 0.1 W was achieved by improving sensitivity in measuring gas evaporation via the following three steps: (1) use of nonmetallic vessel, heat-insulated housing in which the sample is located; (2) optimization for sample vessel thickness and tube size; and (3) stabilization of evaporating gas emitted by the heater. It is widely expected that the proposed apparatus may be used for individual measurement of the magnetization loss and the transport current loss in HTS coils, as well as their total losses, in addition to the AC loss in irregularly shaped samples View full abstract»

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  • Electrical and Mechanical Properties of Strands in Superconducting Triplets

    Publication Year: 2006 , Page(s): 108 - 110
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    Contact resistance on strands is an important parameter for characterizing stability of cable-in-conduit conductors. We prepared triplets made of three strands with four different twist pitches (25, 50, 65 mm and untwisted). The electrical and mechanical properties of the strands were measured, after cycling 10 times with a peak force of 667 N/m. The contact area between the strands could be precisely estimated, and then the surface resistance was evaluated. As a result, the contact resistance and the surface resistance between the strands depended on the twist pitches of the wires. The results become fundamental data to simulate an electric circuit model consisting of more than one sub-cable, and also to estimate the inter-coupling losses in the cables View full abstract»

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  • Magnetization Loss in a Striated YBCO Coated Conductor Considering the Intrinsic Critical Current Distribution

    Publication Year: 2006 , Page(s): 111 - 114
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (228 KB)  

    In this work we present numerical analysis results of the magnetization loss in a perpendicular AC magnetic field. The numerical analysis is based on the relation of the linkage magnetic flux to current distribution, and takes into account the Jc-B characteristic, and n value-B characteristic. We discuss the relation between the magnetization losses with striated superconducting tape and the semicylindrical intrinsic critical current density distribution across the width of the superconducting tape. The result shows that the magnetization loss of monocore superconducting tape in a low magnetic field is affected by the intrinsic semicylindrical critical current density distribution. With a striated structure, the influence of the intrinsic critical current density distribution is reduced View full abstract»

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  • Dependence of AC Loss With a Phase Difference Between Transport Current and Applied Magnetic Field

    Publication Year: 2006 , Page(s): 115 - 118
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (341 KB)  

    We experimentally and numerically investigated the characteristics of the AC losses in Bi2223/Ag sheathed tape by the phase difference between the transport current and external magnetic field perpendicular and parallel to the tape face. The characteristics can be explained by the time evolution of the current density distributions of the cross section of superconducting tape View full abstract»

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  • Characteristics Measurements of HTS Tape with Parallel HTS Tapes

    Publication Year: 2006 , Page(s): 119 - 122
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (209 KB)  

    Many high temperature superconducting (HTS) tape manufactures make an effort to reduce the transport current loss of HTS tapes. The knowledge of critical current and self-field in an HTS tape is very useful to compute the transport current losses. The spatial distribution and magnitude of self-field are variable due to the neighboring materials. In this paper, the critical currents and the transport current losses of BSCCO and YBCO tapes with paralleled magnetic material (Ni tape) and/or diamagnetic material (BSCCO tape) are experimentally investigated to improve the AC loss properties. The critical currents of HTS tapes with paralleled Ni tape are slightly decreased and the transport current losses are markedly increased. However, the critical currents and transport current losses of HTS tapes with paralleled BSCCO tape have not current carrying are more improved than single HTS tape View full abstract»

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  • Theoretical Estimation of Electromagnetic Loss From the Movement of Superconducting Coil in the W7-X Stellarator

    Publication Year: 2006 , Page(s): 123 - 126
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    We investigated the dissipation, occurring when a superconducting coil experiences a transient in the magnetic field generated by other coil. Such mechanism could be relevant during energizing the main magnetic field in the W7-X machine, when the mutual forces between superconducting coils could lead to their deformations or movements. Significant paths for current loops have been identified, and the formulas allowing the estimation of dissipated heat derived. All contributions to the heat generation due to eddy currents, coupling and hysteresis losses could be included into the calculations. Finite element simulations have been used to determine the typical transient of magnetic field that could be expected inside the W7-X coil due to mechanical movement. We found that one can foresee magnetic field changes of about 20 mT occurring during 40 milliseconds. Applying the formulas derived for transient loss for the case of such field change, the maximum dissipation connected with one event was estimated to be less than 0.16 mJ/cm3, which is tolerable for the magnet design of W7-X View full abstract»

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  • Electromagnetic Field Analysis of YBCO Coated Conductors in Multi-Layer HTS Cables

    Publication Year: 2006 , Page(s): 127 - 130
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (221 KB)  

    Electromagnetic field analyses of YBCO coated conductors in mono-layer and multi-layer high Tc superconducting (HTS) cables with practical configurations were carried out to calculate their AC losses. Numerical models employing one-dimensional FEM and two-dimensional FEM were used in the analyses. The error of the 1D-model was assessed by comparing the loss calculated by the 1D-model and that calculated by the 2D-model. The gap between the conductors in each layer, the relative position of conductors in the inner layer and in the outer layer, and the number of layers were varied to study their influence on the AC loss. The numerically calculated AC losses were compared with the analytical values View full abstract»

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  • Magnetization Loss and Shield Effect in Multi-Stacked Tapes With Various Stacking Configurations

    Publication Year: 2006 , Page(s): 131 - 134
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (770 KB)  

    AC loss is one of the major topics in large AC power applications using high temperature superconductor such as power transformers, transmission cables and fault current limiters because it is closely related to operation efficiency. Multi-stacked tape conductors should be used to transport the large current in those power applications. A research of various arrangements of HTS tapes for multi-stacked tapes has been performed to increase the capacity of transport current in HTS power applications. In this paper, we studied magnetization loss and shield effect from several different arrangements of BSCCO tapes such as Face-to-Face type, regular matrix type (mtimes2) and irregular matrix type. The results show that the magnetization loss of the Face-to-Face arrangement was lower than those of the other matrix types for the same stacking numbers. We think that the result was due to the shield effect by demagnetization of adjacent HTS tapes which were located as face to face View full abstract»

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  • Analysis of AC Loss and Current Distribution Characteristics of Multi-Layer Triaxial HTS Cable for 3-Phase AC Power Transmission

    Publication Year: 2006 , Page(s): 135 - 138
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (276 KB)  

    This paper presented numerical studies on layer-to-layer current distributions and AC losses in triaxial multi-layer three-phase cable conductors. The simulations were performed for triaxial cables of 2-layer/phase configurations with several combinations of twist pitch to investigate the influence of the cable twist configuration on the layer-to-layer current distribution and the AC loss under 3-phase AC operation. From the numerical results, it was shown that the twist pitch combinations for uniform layer-to-layer current distributions could be found. The numerical results also showed, however, that the AC loss can not be reduced by equalizing the layer-to-layer current distribution. The reason is clarified from the numerical data of the current density profiles across the superconducting layers. For the cable design, it is necessary to select proper twist configuration considering not only the equalization of current distribution but also the minimization of AC loss View full abstract»

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  • Numerical Study on AC Loss Characteristics of HTS Coils With Various Cross Sections and Methods of AC Loss Reduction

    Publication Year: 2006 , Page(s): 139 - 142
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (308 KB)  

    AC loss characteristics of high temperature superconducting coils wound by Bi2223/Ag tape with various cross sections are numerically investigated. The numerical results show that the smaller coil aspect ratio, the smaller AC losses in the HTS coil. It was considered from the numerical results that the coil aspect ratio giving the minimum coil volume is the better shape judging from the many aspects such as the required length of tape, the stored energy, the central magnetic field and the critical current together with the AC loss. It was also shown by the numerical study that the optimal coil design giving the reduced AC loss can be done by employing the stepped cross section coil and the turn number graded coil View full abstract»

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Aims & Scope

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

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Britton L. T. Plourde
Syracuse University
bplourde@syr.edu
http://asfaculty.syr.edu/pages/phy/plourde-britton.html