# IEEE Transactions on Applied Superconductivity

## Issue 5 • Aug. 2017

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## Filter Results

Displaying Results 1 - 22 of 22
• ### Frontcover

Publication Year: 2017, Article Sequence Number: 0003101
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• ### IEEE Transactions on Applied Superconductivity publication information

Publication Year: 2017, Article Sequence Number: 0003201
| |PDF (51 KB)

Publication Year: 2017, Article Sequence Number: 0003302
| |PDF (135 KB)
• ### Chemical–Mechanically Planarized Cross-Type Josephson Junctions in Nb-Al-AlOx-Nb Technology

Publication Year: 2017, Article Sequence Number: 1101004
| |PDF (440 KB) | HTML

Fabrication of devices composed of Josephson junctions in trilayer technology is usually compromised by the topography of the subjacent layers. If the structures of subsequent layers traverse steps, several adverse effects arise. Lithography may be impaired because of issues with resist thickness uniformity and focus depth, and the superconducting ampacity of the Nb wiring is reduced. Various meth... View full abstract»

• ### Analysis of Nonlinearity in Step in Width Discontinuity of Superconducting Coplanar Waveguide Structures

Publication Year: 2017, Article Sequence Number: 1502709
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In this paper, the nonlinearity in superconducting coplanar waveguides (SCPWs) with step in width discontinuities has been analyzed using a distributed nonlinear circuit model. In such structures, nonlinearities depend on the current distribution of the central strip of the SCPW. A numerical electromagnetics approach based on the method of moments, which analyzes high-frequency planar circuits, de... View full abstract»

• ### Surface Resistance of Superconductors in the Presence of a DC Magnetic Field: Frequency and Field Intensity Limits

Publication Year: 2017, Article Sequence Number: 3500506
Cited by:  Papers (2)
| |PDF (388 KB) | HTML

We revisit the classical rigid-fluxon model which describes the effect of an applied magnetic flux on the RF surface resistance of a superconductor and discuss explicit formulations for a few limit cases. As an application, we discuss the role of magnetic flux on the enhanced surface resistance of RF accelerating cavities based on niobium, depending on its material properties. We also assess the c... View full abstract»

• ### Broadband Electromagnetic Modeling of the Superconducting Toroidal Field Magnets of JT-60SA: Transient Simulation and Fault Detectability

Publication Year: 2017, Article Sequence Number: 4201608
| |PDF (889 KB) | HTML

The superconducting toroidal field (TF) magnets of JT-60SA are designed to conduct a 25.7 kA current to generate a steady magnetic field for plasma confinement. In case of loss of their superconductive status, a fast discharge of the current is operated and the TF magnets are subjected to electromagnetic transient phenomena in a range of frequencies up to several tens of kHz. The TF coils show an ... View full abstract»

• ### Modeling of Quench in the Coupled HTS Insert/LTS Outsert Magnet System of the NHMFL

Publication Year: 2017, Article Sequence Number: 4301013
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The National High Magnetic Field Laboratory (NHMFL), Tallahassee, FL, USA, has developed a 32-T all-superconducting user magnet system combining two series-connected high-field high-temperature superconductor (HTS) nested inner coils (insert) wound with SuperPower REBCO tapes and a low-temperature superconducting (LTS) outer magnet (outsert) composed of five coils (broken in 17 electrical sections... View full abstract»

• ### Conceptual Design of Scanning Magnets for Superconducting Proton Therapy Facility

Publication Year: 2017, Article Sequence Number: 4400708
| |PDF (996 KB) | HTML

The performance of scanning magnets is the key to the treatment of proton accelerator in nozzle of the Superconducting Proton Therapy System (SPTS), which directly affects the quality of the proton beam and the size of the radiation field. The scanning magnets set at the entrance of the beam irradiation system are two dipole magnets to scan the beam in both horizontal and vertical directions and f... View full abstract»

• ### Design and Test of Superconducting Magnet in a 50 kW Superconducting Synchronous Generator

Publication Year: 2017, Article Sequence Number: 5203607
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Superconducting magnet (SM) plays a crucial role in the success or failure of a superconducting generator. The SM of a 50 kW superconducting synchronous generator (SSG) was studied in this paper. Magnesium diboride superconducting wires are employed to wind the SM. First, the initial structure of SM is designed by finite element modeling. After which an approach based on response surface methodolo... View full abstract»

• ### Potential of Partially Superconducting Generators for Large Direct-Drive Wind Turbines

Publication Year: 2017, Article Sequence Number: 5203711
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This paper aims at assessing the potential of partially superconducting generators for 10 MW direct-drive wind turbines by investigating their performance for a very wide range of excitation currents. Performance indicators such as shear stress and efficiency and other generator characteristics are compared for 12 different generator topologies. To be sufficiently attractive, superconducting gener... View full abstract»

• ### Levitation Force Maximization in HTS Magnetic Bearings Formulated by a Semianalytical Approach

Publication Year: 2017, Article Sequence Number: 5203811
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High-speed rotatory electromechanical devices can be practically implemented using magnetic bearings that provide a contactless operation. Besides the contactless operation, high-temperature superconducting (HTS) bearings possess an exclusive feature, i.e., self-stability. This characteristic removes requiring any control schemes and consequently an easier implementation and lower costs would be e... View full abstract»

• ### A Study on the Design and Comparison of 1–100-MJ-Class SMES Magnet With Different Coil Configurations

Publication Year: 2017, Article Sequence Number: 5700809
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The MJ-class superconducting magnetic energy storage system (SMES) is most likely put into commercial utility applications. In China, several 1-100-MJ-class high-temperature superconducting (HTS) SMES projects are undergoing preresearch and conceptual design stage by the government and the power grid corporations, and these SMESs will be developed later. The configurations of commonly used SMES ma... View full abstract»

• ### Residual Stress in Nb3Sn Superconductor Strand Introduced by Structure and Stoichiometric Distribution After Heat Treatment

Publication Year: 2017, Article Sequence Number: 6000909
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Nb3Sn, a widely adopted superconducting material, suffers from fragility and sensitivity to strain. Many studies have anticipated these drawbacks to be greatly influenced by thermal expansion mismatch between the Nb3Sn superconducting phase and matrix. We conducted X-ray diffraction (XRD) stress analysis on a heat treated bronze strand at room temperature and found that its a... View full abstract»

• ### Comparative Measurements of ITER Nb3Sn Strands Between Two Laboratories

Publication Year: 2017, Article Sequence Number: 6001004
Cited by:  Papers (1)
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ITER Nb3Sn strand quality verification tests require large quantities of precise measurements. Therefore, regular cross-checking between testing laboratories is critically important. In this paper, we present results from a cross-checking test of 140 samples between the National High Magnetic Field Laboratory, USA, and the University of Twente, The Netherlands. The tests comprise measur... View full abstract»

• ### Effect of Tape's $I_{rm c}$ Inhomogeneity and Strand Misalignment on the Transport Capacity of Roebel Cables

Publication Year: 2017, Article Sequence Number: 6603605
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In calculations for predicting the performance of high-temperature superconducting (HTS) cables, uniform physical and geometrical properties of the tapes are usually assumed. However, commercially available coated conductor tapes present a certain nonuniformity of their transport capability-namely their critical current-along the length. In addition, when coated conductor strands are compactly ass... View full abstract»

• ### Low-Resistance and Strong-Adhesion Soldering of Second-Generation High-Temperature Superconductor Tapes Within a Short Time

Publication Year: 2017, Article Sequence Number: 6603706
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An effective soldering process of second-generation coated conductors (CCs) with low joint resistance was presented by using home-made equipment in the present study. The benefit of preprocessing, i.e., polishing, was proved with respect to the reduced joint resistances based on the voltage-current curves. It is revealed that the joint resistance of 10-8 Ω with an overlapping len... View full abstract»

• ### Improved Superconducting Properties by Graphene Doping of Bulk MgB2 Prepared by the Diffusion Method

Publication Year: 2017, Article Sequence Number: 7000105
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A study of the effects of graphene doping on the superconducting properties of MgB2 bulks prepared by the diffusion method has been conducted over a range of doping levels of 0-30 wt%. The increase in a large quantity of a C-containing nonsuperconducting phase together with the effects of C-substitution on the phase itself results in a change of superconducting properties. While the tra... View full abstract»

• ### Optimization of High-Energy Ball Milling Aided Sintering Process for FeSe Superconductors

Publication Year: 2017, Article Sequence Number: 7400204
| |PDF (598 KB) | HTML

Superconducting FeSe bulks with high superconducting content of PbO-type tetragonal β-FeSe phase were prepared with high-energy ball milling (HEBM) aided sintering process. During the HEBM process, different ball-to-powder ratios of 6:1, 8:1, and 10:1 were adopted. The influences of ball-to-powder ratio on the phase composition of both ball milled powders and sintered bulks, morphology, and... View full abstract»

• ### Numerical Simulations of AC Losses in Multifilamentary Superconducting Tapes Under Bending Strain

Publication Year: 2017, Article Sequence Number: 8400710
| |PDF (629 KB) | HTML

AC loss has become a key problem for practical applications of high-temperature superconductors. It is well known that mechanical deformation will affect the critical current and ac loss as the superconductor is subjected to the magnetic field or transport current. In this paper, the ac losses in Bi2Cr2Ca2Cu3O10 (Bi2223)/Ag tapes under bending... View full abstract»

• ### IEEE Transactions on Applied Superconductivity Subject Categories for Article Numbering

Publication Year: 2017, Article Sequence Number: 0003401
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• ### IEEE Transactions on Applied Superconductivity information for authors

Publication Year: 2017, Article Sequence Number: 0003501
| |PDF (49 KB)

## 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