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IEEE Transactions on Applied Superconductivity

Issue 3  Part 3 • June 2013

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

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Displaying Results 1 - 25 of 191
• Front Cover

Publication Year: 2013, Article Sequence Number: 0002501
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• IEEE Transactions on Applied Superconductivity publication information

Publication Year: 2013, Article Sequence Number: 0002601
| PDF (135 KB)

Publication Year: 2013, Article Sequence Number: 0001808
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• Finite Element Simulations of Twisted NbTi Conductors

Publication Year: 2013, Article Sequence Number: 6000105
Cited by:  Papers (9)
| | PDF (300 KB) | HTML

Low-temperature superconducting wires, NbTi and Nb3Sn, designed for ac applications, such as CERN and ITER magnets, are composed of twisted multifilament structures. Under time-varying applied magnetic field, twisting decreases the induced electromotive forces between the filaments and is therefore an effective method to reduce interfilamentary coupling. In order to study coupling losse... View full abstract»

• Comparison of Direct Inter-Filament Resistance Measurement on $hbox{Nb}_{3}hbox{Sn}$ Strands Between University of Twente and ENEA

Publication Year: 2013, Article Sequence Number: 6000204
Cited by:  Papers (5)
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Experimental results of interfilament resistance measurements obtained with different facilities are compared. Two internal tin Nb3Sn strand types are tested at the University of Twente (UT) and ENEA Frascati. The direct interfilament resistance is measured with a standard four-point voltage-current (V- I) method. At the UT, a probe-station is used with micropoint-contact ... View full abstract»

• Thermal Conductivity of Industrial $hbox{Nb}_{3} hbox{Sn}$ Wires Fabricated by Various Techniques

Publication Year: 2013, Article Sequence Number: 6000404
Cited by:  Papers (4)
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We have developed a new experimental setup specifically designed for measuring thermal conductivity on technical superconductors in the range of temperatures 3-330 K in magnetic fields up to 21 T. Three Nb3Sn wires, produced by the powder-in-tube technique, the bronze route, and the internal tin restacked-rod process, respectively, have been investigated. We show that, due to the comple... View full abstract»

• Radioactivity of $hbox{Nb}_{3}hbox{Sn/Cu}$ Wires After Proton Irradiation

Publication Year: 2013, Article Sequence Number: 6000504
Cited by:  Papers (2)
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Superconducting magnets based on Nb3Sn technology are being developed for the LHC high luminosity upgrade. In this context, irradiation induced changes of the superconducting properties of state-of-the-art Ti and Ta doped Nb3 Sn wires are presently studied. During irradiation tests with protons of 65 MeV at the cyclotron of Université Catholique de Louvain (UCL), 1.4 ... View full abstract»

• Transformation Heat Treatment of Rapidly Quenched $hbox{Nb}_{3}hbox{Al}$ Precursor Monitored In Situ by High Energy Synchrotron Diffraction

Publication Year: 2013, Article Sequence Number: 6000604
Cited by:  Papers (1)
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Nb3Al superconductors are studied for use in high field magnets. Fine-grained Nb3Al with nearly stoichiometric Al content is obtained by a rapid heating quenching and transformation process. We describe a nondestructive in situ study of the transformation process step of a rapid heating quenching Nb3Al precursor wire with ramp rates of either 120 °C/h or 800... View full abstract»

• Effect of Thermal Cycle on the Lattice Structure in $hbox{RHQ-Nb}_{3}hbox{Al}$ Superconducting Wire

Publication Year: 2013, Article Sequence Number: 6000704
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In A15 superconducting wires, it is known that the critical current has a dependence on the strain in a magnetic field. Therefore, RHQ-Nb3Al wires are being studied to develop a high field magnet. Since the wire is usually composed of three or more materials, residual strain is induced by the different coefficients of thermal expansion in the materials in the cooling process after A15 p... View full abstract»

• Applicability of Reel-to-Reel RHQ Treatments to $hbox{Nb}_{3}hbox{Al}$ Precursors With a Ta/Cu/Ta Three-Layer Filament-Barrier Structure

Publication Year: 2013, Article Sequence Number: 6000805
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A tension-free rapid heating and quenching (RHQ) simulator was previously employed to demonstrate that a ductile and normal-conducting Cu layer can suppress a magnetic field instability and improve bending strain tolerance. However, a molten Cu barrier caused the filament to be shifted from the original location, and excess heating caused the Cu to locally corrode a Ta layer, through which it diff... View full abstract»

• Design of Transformation-Processed $hbox{Nb}_{3} hbox{Al}$ Conductors to Balance Drawability and Inter-Filament Decoupling

Publication Year: 2013, Article Sequence Number: 6001004
Cited by:  Papers (1)  |  Patents (1)
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Transformation-processed Nb3Al superconductors should be used in conjunction with a high-melting-point matrix material such as Nb. However, Nb is superconductive below 9 K, which causes low-field instability due to magnetic interfilament coupling at liquid He temperature. One alternative matrix material is Ta. However, the use of Ta sacrifices the drawability of the precursor wires, inc... View full abstract»

• Superconducting Strand and Cable Development for the LHC Upgrades and Beyond

Publication Year: 2013, Article Sequence Number: 6001112
Cited by:  Papers (13)
| | PDF (2492 KB) | HTML

Fermilab and CERN have started the development of 11 T Nb3Sn dipoles to replace a number of Large Hadron Collider (LHC) NbTi dipole magnets and free space for the additional collimators anticipated for the LHC luminosity upgrades. An essential step in the design of these magnets is the development of the 40-strand, high aspect ratio cable needed to achieve the nominal field of 11 T at t... View full abstract»

• Status of Conductor Qualification for the ITER Central Solenoid

Publication Year: 2013, Article Sequence Number: 6001208
Cited by:  Papers (30)
| | PDF (802 KB) | HTML

The ITER central solenoid (CS) must be capable of driving inductively 30 000 15 MA plasma pulses with a burn duration of 400 s. This implies that during the lifetime of the machine, the CS, comprised of six independently powered coil modules, will have to sustain severe and repeated electromagnetic cycles to high current and field conditions. The design of the CS calls for the use of cable-in-cond... View full abstract»

• $J_{rm c}(B, T)$ Characterization of Commercial NbTi Strands for the ITER Poloidal Field Coils by Transport and Magnetization Methods

Publication Year: 2013, Article Sequence Number: 6001304
Cited by:  Papers (6)
| | PDF (479 KB) | HTML

Commercial multifilamentary NbTi strands produced by the Russian Federation Domestic Agency for the ITER poloidal field (PF) coils PF1 and PF6 were characterized regarding by magnetization and transport measurements. The results of critical current measurements at magnetic fields in the wide range from 2 to 10 T and at temperatures from 3.5 to 7.5 K are presented. The experimental results were obt... View full abstract»

• Feasibility Studies of 0.7 mm $hbox{Nb}_{3}hbox{Al}$ Strands and Rutherford Cable

Publication Year: 2013, Article Sequence Number: 6001404
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We are planning to demonstrate a quadrupole magnet with magnetic mirror structure by using 0.7-mm Nb3Al strands. As feasibility studies for this program, we investigated an influence of the diameter reduction of Cu-stabilized Nb3Al strands from 1.0 to 0.7 mm. Wire breakages and Cu separations did not happen with applying the cold die-drawing. The non-Cu Jc a... View full abstract»

• Analytical Study of Degradation of CIC Conductor Performance Due to Strand Bending and Buckling

Publication Year: 2013, Article Sequence Number: 6001505
Cited by:  Papers (3)
| | PDF (518 KB) | HTML

Critical current of cable-in-conduit conductors for ITER TF coils was measured using a pair of short cable-in-conduit conductors, which are electrically connected from each other at the bottom joint. It was found from these test results that the measured critical current was lower than that evaluated from the critical current performance of a single strand. One of the explanations for this phenome... View full abstract»

• Pulsed Magnetic Field Assisted Technique for Joining $hbox{MgB}_{2}$ Conductors for Persistent Mode MRI Magnets

Publication Year: 2013, Article Sequence Number: 6200104
Cited by:  Papers (6)
| | PDF (618 KB) | HTML

The commercial availability of long lengths of MgB2 conductor with an increasingly attractive price-to-performance ratio encourages its use in cryogen-free magnetic resonance imaging magnets. For such a magnet operating in persistent mode, connections between MgB2 wires must be completely superconducting to ensure long-term magnetic field stability. A new electromagnetically ... View full abstract»

• Critical Current Density and Current Transfer Length of Multifilamentary $hbox{MgB}_{2}$ Strands of Various Design

Publication Year: 2013, Article Sequence Number: 6200204
Cited by:  Papers (8)
| | PDF (575 KB) | HTML

In this paper, a series of high-performing powder-in-tube MgB2 strands have been prepared. Transport voltage-current measurements were performed to determine the effects of C doping and strand geometry such as filament numbers. The best Jc for our samples was 1.0 × 105 A/cm2 at 4.2 K, 7 T, for a strand using B powder with 3% C addition. The... View full abstract»

• Monofilament $hbox{MgB}_{2}$ Wire for a Whole-Body MRI Magnet: Superconducting Joints and Test Coils

Publication Year: 2013, Article Sequence Number: 6200304
Cited by:  Papers (14)
| | PDF (815 KB) | HTML

This paper presents recent results from our continued development of a 0.5 T whole-body MRI magnet at the Francis Bitter Magnet Laboratory. HyperTech Research Corp. (Columbus, OH) manufactures the MgB2 conductor for this project. During the past year, we have found that our technique, originally developed successfully to splice unreacted multifilament MgB2 wires, works much b... View full abstract»

• Improved Critical Current Density in $hbox{it Ex Situ}$ Processed Carbon-Substituted $hbox{MgB}_{2}$ Tapes by Mg-Addition

Publication Year: 2013, Article Sequence Number: 6200405
| | PDF (545 KB) | HTML

Grain coupling and critical current density (Jc) property were improved in ex situ processed MgB2 tapes by using a mixture of MgB2 and Mg powders with a planetary ball-milling treatment with mineral and silicon oils. The milling process with the oils chemically and mechanically probably peels off the damaged surface layers of the filling powder. The mineral ... View full abstract»

• Improved Performances of $hbox{MgB}_{2}$ Conductor by Using of Innovative Amorphous and Nano-Structurated Boron

Publication Year: 2013, Article Sequence Number: 6200504
Cited by:  Papers (4)
| | PDF (307 KB) | HTML

In this paper, we report about improved performances of amorphous and nano-structurated boron in MgB2 critical current density of wires and tapes. The boron produced by magnesiothermic reaction, using nano-structurated boron oxide, is used to synthesize nano-structurated MgB2 powders. These powders are used to produce several wires by ex-situ P.I.T. method. Here we applied on... View full abstract»

• $hbox{MgB}_{2}$ Hollow Wires and Cables Embedded in a Mg Alloy Matrix

Publication Year: 2013, Article Sequence Number: 6200605
Cited by:  Papers (4)
| | PDF (431 KB) | HTML

The brittleness of the MgB2 wires prevents performing a cable architecture with very small bending radius, similar to NbTi Rutherford cables. Consequently, it is important to reduce the thickness of the superconducting materials in order to increase its bending strain limit. In this context, thin Ni sheathed MgB2 hollow wires, having wall thickness of the order of 20 μ... View full abstract»

• Synergetic Combination of LIMD With CHPD for the Production of Economical and High Performance $hbox{MgB}_{2}$ Wires

Publication Year: 2013, Article Sequence Number: 6200704
Cited by:  Papers (5)
| | PDF (450 KB) | HTML

We propose an economical fabrication concept, the localized internal magnesium diffusion (IMD) method. Instead of using a single magnesium (Mg) rod in the center of a metal sheath tube, we use large-sized Mg particles (20-50 mesh) mixed well with cheap 97% crystalline boron powder to fill the metal sheath tube. After a repeated drawing process, the coarse Mg is elongated along the core wire axis o... View full abstract»

• DC Superconducting Cable Using $hbox{MgB}_{2}$ Wires

Publication Year: 2013, Article Sequence Number: 6200805
Cited by:  Papers (5)  |  Patents (1)
| | PDF (722 KB) | HTML

Tsinghua University, University of Cambridge, and MIT are collaborating to design, construct, and test an MgB2 dc cable for microgrid applications. Two-stage current leads with nitrogen vapor cooled copper and gaseous helium cooled hightemperature superconductor will be used. The two-stage cryostat will be cooled using a single helium fan with a recuperator. The helium gas used to cool ... View full abstract»

• Recent Advances in Bi-2212 Round Wire Performance for High Field Applications

Publication Year: 2013, Article Sequence Number: 6400104
Cited by:  Papers (6)
| | PDF (690 KB) | HTML

There has been sustained interest in the development of Bi-2212/Ag round wire because of its unique potential for application in ultra-high-field magnets (>; 25 T). Our development activity with this material has been focused on improving the engineering current density. Filament densification by swaging and isostatic pressing processes have been evaluated, as has further optimization of the me... 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