# IEEE Transactions on Applied Superconductivity

## Volume 19 Issue 3  Part 3 • June 2009

This issue contains several parts.Go to:  Part 1  | Part 2

## Filter Results

Displaying Results 1 - 25 of 268

Publication Year: 2009, Page(s): C1
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• ### IEEE Transactions on Applied Superconductivity publication information

Publication Year: 2009, Page(s): C2
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Publication Year: 2009, Page(s):2521 - 2532
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• ### Superconductors in Applications; Some Practical Aspects

Publication Year: 2009, Page(s):2533 - 2539
Cited by:  Papers (17)
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The first blush of success in the search for a new superconductor is usually a high transition temperature, T<sub>c</sub>. However, all power applications of superconductors and most other applications requires good current carrying capacity, usually characterized by a critical current I<sub>c</sub>, within substantial magnetic fields, usually characterized by a critical ma... View full abstract»

• ### The Effect of Thermo-Mechanical Treatments on$J_{c}(T,B)$and$T_{cs}$of Nb-Ti Strands

Publication Year: 2009, Page(s):2540 - 2543
Cited by:  Papers (6)
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An extended database of critical current densitiesJc(T,B) and current sharing temperatures Tcsfor Nb-Ti strands was obtained in this work. This data set allows one to make a more realistic forecast of the ITER poloidal field (PF) coil critical current at temperatures above 6 K and in a magnetic field of 6 T. It is found thatJc(4.2 K, 5 T) lies in t... View full abstract»

• ### Magnetic and Transport Characterization of NbTi Strands as a Basis for the Design of Fusion Magnets

Publication Year: 2009, Page(s):2544 - 2547
Cited by:  Papers (10)
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We present the results of an extended measurement campaign carried out on available NbTi commercial strands to be used in the design of fusion reactor magnets, including candidate strands for the ITER high field Poloidal Coils, PF1/6, and for the Toroidal Field Coils of the JT-60SA Tokamak. Magnetic and transport measurements have been carried out at variable temperature and magnetic field. From m... View full abstract»

• ### Titanium Doped${\hbox {Nb}}_{3}{\hbox {Sn}}$Superconductor Fabricated by the Internal Tin Tube (ITT) Approach

Publication Year: 2009, Page(s):2548 - 2551
Cited by:  Papers (3)
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Multifilament Nb3Sn superconductor has been produced by the internal tin tube (ITT) approach. The process employs tubular niobium filaments with cores consisting of tin or high tin alloy inside a copper sheath. The niobium annulus of each filament contained eight Nb-47Ti ldquoislands.rdquo During the subsequent reaction heat treatments the titanium was diffused out of these islands and ... View full abstract»

• ### Superconducting Properties of${\rm Nb}_{3}{\rm Sn}$Wire Fabricated by Diffusion Reaction Between Ag-Sn-Mg Alloy and Nb

Publication Year: 2009, Page(s):2552 - 2555
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Mg addition improvesTc,Birr, andIcof the Nb3Sn formed by diffusion reaction between Nb and Ag-Sn alloy, when the diffusion reaction is performed below 650degC. The obtained superconducting properties are similar to those of the bronze-processed Nb3Sn. The formation temperature of Nb3Sn is reduced by t... View full abstract»

• ### New Ti-Sn Intermetallic Compound and$({\hbox {Nb}},{\hbox {Ti}})_{3}{\hbox {Sn}}$Conductor

Publication Year: 2009, Page(s):2556 - 2559
Cited by:  Papers (6)
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New Ti-Sn intermetallic compound of Ti2Sn3could be easily synthesized at both of diffusion couple and powder mixture. It was found that Ti2Sn3is very brittle and easily deformed to fine powders. This new high Sn-based compound could be used for an additional Ti and Sn source for the bronze processed (Nb,Ti)3Sn wires. The hybrid bronze processe... View full abstract»

• ### Researches of Structure Formation Peculiarities in the Internal-Tin${\hbox {Nb}}_{3}{\hbox {Sn}}$Strands

Publication Year: 2009, Page(s):2560 - 2563
Cited by:  Papers (1)
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Addition of manganese in elements of matrix for internal-tin Nb3Sn strands has been investigated. Two types of multifilamentary strands with distributed source of tin, 1.8 wt.% Mn in elements of matrix before reaction heat treatment and 1 wt.% Mn in matrix after reaction, have been fabricated by internal-tin method. One of the produced strands had reinforced stabilizer from CuNb nanocom... View full abstract»

• ### Heat Treatment Optimization Studies on PIT${\rm Nb}_{3}{\rm Sn}$Strand for the NED Project

Publication Year: 2009, Page(s):2564 - 2567
Cited by:  Papers (25)
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For the Next European Dipole (NED) program, a Powder-In-Tube (PIT) strand was successfully developed by SMI. This high-performance Nb3Sn strand presents a non-copper critical current density of ~ 2500 A/mm2at 12 T applied field and 4.2 K and a filament diameter around 50 mum. Extensive heat treatment optimization studies were performed in order to maximize both critical curre... View full abstract»

• ### The Effect of Second Phase Additions on the Microstructure and Bulk Pinning Force in${\rm Nb}_{3}{\rm Sn}$PIT Wire

Publication Year: 2009, Page(s):2568 - 2572
Cited by:  Papers (2)
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The effect of second phase gadolinium and yttrium additions on the microstructure and the bulk pinning force are reported for PIT Nb3Sn mono-wires. High resolution SEM of the grain morphology show smaller grain size for mono-wires with the second phase additions after 750degC and 850degC heat treatment compared to control samples. The bulk pinning force properties are determined from ma... View full abstract»

• ### Internal Tin${\hbox {Nb}}_{3}{\hbox {Sn}}$Conductors Engineered for Fusion and Particle Accelerator Applications

Publication Year: 2009, Page(s):2573 - 2579
Cited by:  Papers (32)
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The critical current density (Jc) of Nb3Sn strand has been significantly improved over the last several years. For most magnet applications, high Jcinternal tin has displaced bronze process strand. The highest Jcvalues are obtained from distributed barrier strands. We have continued development of strands made with Nb-47 wt%Ti rods to supply the dopant, ... View full abstract»

• ### Systematic Changes of the Nb-Sn Reaction With Time, Temperature, and Alloying in Restacked-Rod-Process (RRP)${\hbox {Nb}}_{3}{\hbox {Sn}}$Strands

Publication Year: 2009, Page(s):2580 - 2583
Cited by:  Papers (12)
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Reaction heat treatments spanning 605 to 750degC and 24 to ~400 hours were applied to several sets of RRP strands. Magnetization and transport measurements were used to track the changes of superconducting properties and the amounts of Nb3Sn formed. The experiments showed that temperature increases of 15degC produced equivalent properties in half the time within the temperature range 62... View full abstract»

• ### Structure and High-Field Performance of New${\hbox {Nb}}_{3}{\hbox {Sn}}$Wires Fabricated From Sn-Based Alloys

Publication Year: 2009, Page(s):2584 - 2587
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Sn-Ta based quaternary alloys were prepared by the reaction of constituent metal powders. The alloys were fabricated into sheet or rod forms. In addition, Sn-Ti based ternary alloys prepared by melt and cast procedure were fabricated into sheets. Jelly Roll (JR) composites were prepared using Sn-based alloy sheet and Nb sheet, and then fabricated into wires. A Bc2(4.2 K) of 26.9 T (mid)... View full abstract»

• ### Investigation of the Effects of Low Temperature Heat Treatments on the Microstructure and Properties of Multifilamentary, Tube-Type${\rm Nb}_{3}{\rm Sn}$Strands

Publication Year: 2009, Page(s):2588 - 2592
Cited by:  Papers (7)
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Multifilamentary, tube-type composites consisting of subelements of Nb with a simple Cu/Sn binary metal inserts were studied in an attempt to enhance the performance boundaries of these conductors. TransportJcvalues for these multifilamentary strands were found to be as high as 2440 A/mm2at 12 T, 4.2 K for 217 strand conductors. We focused on correlating the compositio... View full abstract»

• ### Non-Uniform Bronze Formation in Internal Tin${\rm Nb}_{3}{\rm Sn}$Wire

Publication Year: 2009, Page(s):2593 - 2597
Cited by:  Papers (3)
| | PDF (871 KB) | HTML

The bronze phase transformations during the heat treatment of two multifilamentary internal tin Nb3Sn wires for high field applications made by Luvata are investigated and compared with some model single core wires. Non-uniform bronze profiles, non-uniform Sn distributions in different bundles, and Sn concentration gradient inversion were observed. Their possible formation mechanisms an... View full abstract»

• ### An Octagonal Architecture for High Strength PIT${\rm Nb}_{3}{\rm Sn}$Conductors

Publication Year: 2009, Page(s):2598 - 2601
Cited by:  Papers (7)
| | PDF (697 KB) | HTML

Powder-in-Tube (PIT) Nb3Sn conductors have been fabricated with a low-cost intermetallic Cu5Sn4powder as the tin source. A novel octagonal PIT design that incorporates dispersion strengthened copper as well as a hexagonal PIT design were fabricated. In this paper, we compare the critical current and strain properties of the octagonal PIT conductor designs with stan... View full abstract»

• ### ${\rm Nb}_{3}{\rm Sn}$Superconductors Made by an Economical Tubular Process

Publication Year: 2009, Page(s):2602 - 2605
Cited by:  Papers (6)
| | PDF (1987 KB) | HTML

The tubular technique for economical production of Nb3Sn material with large numbers of subelements is being explored further by Supergenics I LLC and Hyper Tech Research Inc. The number of subelements has been raised to 271 (246 + 25) by increasing the size at which the restacking is carried out. The product exhibited no fabrication problems and was drawn down and tested at a wire diam... View full abstract»

• ### Fabrication of Tantalum Sheet for Superconductor Diffusion Barriers

Publication Year: 2009, Page(s):2606 - 2609
Cited by:  Papers (4)
| | PDF (2171 KB) | HTML

Poor deformation behavior of commercial Ta sheet used for Sn diffusion barriers in multifilamentary Nb<sub>3</sub>Sn superconductors leads to excessive Ta-Cu interface roughening and the use of a thick Ta layer to overcome layer fracture. The problem stems from three factors: Ta strain hardens faster and to a much higher flow stress than Cu, pure Cu is adjacent to Ta, and the Ta sheet ... View full abstract»

• ### Characterization of High Current RRP Wires as a Function of Magnetic Field, Temperature, and Strain

Publication Year: 2009, Page(s):2610 - 2614
Cited by:  Papers (9)
| | PDF (266 KB) | HTML

A new instrument for the characterization of superconducting materials as a function of Magnetic Field, Temperature and Strain, was designed, constructed and tested at Lawrence Berkeley National Laboratory (LBNL). A U-shaped bending spring was selected, since that design has proven to enable accurate characterizations of a multitude of superconducting materials for more than a decade. The new devi... View full abstract»

• ### Characterization of High$J_{c}$${\rm Nb}_{3}{\rm Sn}$Strands for the Series-Connected Hybrid Magnet

Publication Year: 2009, Page(s):2615 - 2618
Cited by:  Papers (9)
| | PDF (413 KB) | HTML

The series-connected hybrid magnet under construction at the National High Magnetic Field Laboratory uses cable-in-conduit-conductor with highJcNb3Sn strands. One of the candidate Nb3Sn strands is made by the restacked-rod process with a nominalJcof ~ 2400A/mm2. We characterized the Jcas a function of axial and transverse strain, magnetic field and te... View full abstract»

• ### The Magnetic Field, Temperature and Strain Dependence of the Critical Current of a${\rm Nb}_{3}{\rm Sn}$Strand Using a Six Free-Parameter Scaling Law

Publication Year: 2009, Page(s):2619 - 2623
Cited by:  Papers (3)
| | PDF (252 KB) | HTML

We report comprehensive data for the magnetic field (B < 14.5 T), temperature (4.2 K les T > les 14 K) and uniaxial applied strain dependence (-1% < epsivA< 0.35%) of the critical current density (JC) of an advanced internal-tin Nb3Sn strand developed as part of the International Thermonuclear Experimental Reactor (ITER) program manufactured by Luvata P... View full abstract»

• ### The Influence of Bending Strain on the Critical Current of${\rm Nb}_{3}{\rm Sn}$Strands With Different Filament Twist Pitch

Publication Year: 2009, Page(s):2624 - 2627
| | PDF (363 KB) | HTML

The effect of bending strain on the transport properties of Nb3Sn strands has been the object of several investigations in the last years. We report on the performances of internal tin Nb3Sn strands with different filament twist pitches, pre-compressed by swaging into thin stainless steel tubes before the reaction heat treatment and subject to pure bending strain. We have pre... View full abstract»

• ### Systematic Study on Filament Fracture Distribution in ITER${\hbox {Nb}}_{3}{\hbox {Sn}}$Strands

Publication Year: 2009, Page(s):2628 - 2632
Cited by:  Papers (14)
| | PDF (1629 KB) | HTML

In ITER CICCs, the strands experience varying mechanical strain levels due to thermal compression and electromagnetic loading, cumulating into severe periodic bending and contact strain. Depending on the choice of the cabling pattern, the strain may exceed the irreversibility limit leading to cracks in the Nb3Sn filaments and degraded performance of the conductors. We present a systemat... View full abstract»

## 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