Niobiumtin
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Back to TopConferences related to Niobiumtin
Back to Top2019 Particle Accelerator Conference (PAC)
Particle accelerator science and technology
2013 Low Temperature Superconductivity Workshop (LTSW)
Iindustry workshop on the technology of superconductors for magnetic applications.
Periodicals related to Niobiumtin
Back to TopApplied Superconductivity, IEEE Transactions on
Contains articles on the applications and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Power applications include magnet design as well asmotors, generators, and power transmission
Electron Devices, IEEE Transactions on
Publishes original and significant contributions relating to the theory, design, performance and reliability of electron devices, including optoelectronics devices, nanoscale devices, solidstate devices, integrated electronic devices, energy sources, power devices, displays, sensors, electromechanical devices, quantum devices and electron tubes.
Magnetics, IEEE Transactions on
Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The Transactions publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.
Nuclear Science, IEEE Transactions on
All aspects of the theory and applications of nuclear science and engineering, including instrumentation for the detection and measurement of ionizing radiation; particle accelerators and their controls; nuclear medicine and its application; effects of radiation on materials, components, and systems; reactor instrumentation and controls; and measurement of radiation in space.
Plasma Science, IEEE Transactions on
Plasma science and engineering, including: magnetofluid dynamics and thermionics; plasma dynamics; gaseous electronics and arc technology; controlled thermonuclear fusion; electron, ion, and plasma sources; space plasmas; highcurrent relativistic electron beams; laserplasma interactions; diagnostics; plasma chemistry and colloidal and solidstate plasmas.
Xplore Articles related to Niobiumtin
Back to TopCritical surface of multifilamentary Nb/sub 3/Sn wires
IEEE Transactions on Magnetics, 1994
Voltagecurrent characteristics (VCC) of multifilamentary Nb/sub 3/Sn wire at magnetic fields up to 8 T and temperatures up to 17 K are presented. the VCC are exponential in the studies interval of magnetic fields and temperatures. The dependences of J/sub c/(B,T) and J/sub 0/(B,T) were derived. The results obtained are explained by the presence of Nb/sub 3/Sn components that differ ...
Influence of the field orientation on the critical current density of Nb/sub 3/Sn strands
IEEE Transactions on Applied Superconductivity, 1997
In many applications using superconducting cables such as tokamaks for fusion, the angle between the strand axis and the applied field can take values different than 90/spl deg/. Estimating the critical current value for any angles knowing only its value for the wellknown perpendicular orientation at a given field, is very useful. A model is presented that could achieve, for ...
European development of high performance Nb/sub 3/Sn strand for the ITER model coils
IEEE Transactions on Applied Superconductivity, 1995
The ITER model coils will use two types of strands, one with high Jc, HP I, one with low hysteretic losses, HP II. Main specifications for the two strands are: HP I: Jc (nonCu)>700 A/mm/sup 2/ at 12 T @ 4.2 K, hysteresis losses<600 mJ/cc (+3 T); HP II: Jc (non Cu)>550 A/mm/sup 2/ at 12 T @ 4.2 K, ...
Fabrication of large diameter externaldiffusion processed Nb<inf>3</inf>Sn composites
IEEE Transactions on Magnetics, 1983
Large diameter multifilamentary Nb3Sn composites have been fabricated by the externaldiffusion process. Consideration of the phase relationship in the CuSn binary system, Sn diffusion kinetics and vacancy diffusion has led to the development of an appropriate Sn homogenization anneal. By correctly annealing the composites Sn flow and Kirkendall porosity may be controlled. The application of bronze electrodeposition has also been ...
Effect of trapped magnetic flux on ac losses of Nb<inf>3</inf>Sn
IEEE Transactions on Magnetics, 1979
The effect of trapped magnetic flux on 60 Hz losses of Nb3Sn was investigated for a number of samples prepared by solid state diffusion and by reacting niobium with liquid tin. In the presence of trapped flux all samples showed a significant increase of loss at low current densities (e.g. from ∼1 to 10μW/cm2at 500 rms A/cm) and a modest ...
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Educational Resources on Niobiumtin
Back to TopIEEEUSA EBooks

Critical surface of multifilamentary Nb/sub 3/Sn wires
Voltagecurrent characteristics (VCC) of multifilamentary Nb/sub 3/Sn wire at magnetic fields up to 8 T and temperatures up to 17 K are presented. the VCC are exponential in the studies interval of magnetic fields and temperatures. The dependences of J/sub c/(B,T) and J/sub 0/(B,T) were derived. The results obtained are explained by the presence of Nb/sub 3/Sn components that differ in critical parameters.<<ETX>>

Influence of the field orientation on the critical current density of Nb/sub 3/Sn strands
In many applications using superconducting cables such as tokamaks for fusion, the angle between the strand axis and the applied field can take values different than 90/spl deg/. Estimating the critical current value for any angles knowing only its value for the wellknown perpendicular orientation at a given field, is very useful. A model is presented that could achieve, for a given material, such a result thanks to an intrinsic parameter, called the anisotropy parameter, defined as the ratio of the axial critical current in a perpendicular field to the azimutal critical current In a parallel background field. To check the model for Nb3Sn, this parameter has been measured on Nb/sub 3/Sn untwisted strands. We used two methods: one based on magnetic measurements and the other on critical current measurements with several field orientations and strengths. Unexpectedly an anisotropy of the critical current density as a function of the field orientation has been pointed out in these measurements.

European development of high performance Nb/sub 3/Sn strand for the ITER model coils
The ITER model coils will use two types of strands, one with high Jc, HP I, one with low hysteretic losses, HP II. Main specifications for the two strands are: HP I: Jc (nonCu)>700 A/mm/sup 2/ at 12 T @ 4.2 K, hysteresis losses<600 mJ/cc (+3 T); HP II: Jc (non Cu)>550 A/mm/sup 2/ at 12 T @ 4.2 K, hysteresis losses<200 mJ/cc (+3 T). HP I strand performance is likely to be achieved by internal tin Nb/sub 3/Sn, HP II by a bronze route strand. About 25% of the 26 tonnes required by the model coils will be contributed by the European Community. The companies EMLMI, Italy (for internal tin) and Vacuumschmelze, Germany (for bronze route) have been selected by ITER for the strand production. The achievement of HP II performance was already demonstrated by Vacuumschmelze on a 10 km strand manufactured for NET in the frame of a former contract. On the other hand, the HP I internal tin strand was to be developed. In view of this, a contract has been assigned to GEC Alsthom Intermagnetics, France, to have a backup option for internal tin strand. EMLMI (HP I strand) and Vacuumschmelze (HP II strand) have successfully manufactured Nb/sub 3/Sn multifilamentary wires complying with ITER specifications. Work is in progress at GEC Alsthom Intermagnetics to achieve HP I strand performances.<<ETX>>

Fabrication of large diameter externaldiffusion processed Nb<inf>3</inf>Sn composites
Large diameter multifilamentary Nb3Sn composites have been fabricated by the externaldiffusion process. Consideration of the phase relationship in the CuSn binary system, Sn diffusion kinetics and vacancy diffusion has led to the development of an appropriate Sn homogenization anneal. By correctly annealing the composites Sn flow and Kirkendall porosity may be controlled. The application of bronze electrodeposition has also been investigated and found to significantly reduce annealing times. These concepts have been applied successfully to 0.76 mm (0.030 in) diameter composites which have overall critical currents in excess of 7 × 103amps/cm2at 17 Tesla.

Effect of trapped magnetic flux on ac losses of Nb<inf>3</inf>Sn
The effect of trapped magnetic flux on 60 Hz losses of Nb3Sn was investigated for a number of samples prepared by solid state diffusion and by reacting niobium with liquid tin. In the presence of trapped flux all samples showed a significant increase of loss at low current densities (e.g. from ∼1 to 10μW/cm2at 500 rms A/cm) and a modest decrease of loss at higher current densities (e.g. 30% at 1000 rms A/cm). These features are shown to be consistent with the critical state model provided one takes into account the field dependence of surface currents and assumes a considerable decrease of their magnitude with trapped flux. Even with large amounts of trapped flux the losses of most samples remain below 10μW/cm2at 500 rms A/cm, an acceptable loss level for ac power transmission applications.

Conceptual design of the Fermilab Nb/sub 3/Sn high field dipole model
A short dipole model with the 1011 T nominal field based on the Nb/sub 3/Sn superconducting strand is being developed at Fermilab in collaboration with LBNL and KEK as part of the R&D effort for VLHC. This paper describes the magnet conceptual design and parameters as well as the results of magnetic field, mechanical and quench protection calculations. Parameters of the superconducting strand and cable are also reported.

Fiberreinforcedsuperconductors (FRS) of Nb/sub 3/Sn were prepared using titanium and tantalum fibers. Their superconducting characteristics were estimated by separating the effects of prestrain from them. The results have shown that the tantalum fiber functions both as a reinforcement for FRS and as a source that supplies tantalum elements to improve the highfield properties of Nb/sub 3/Sn. The characteristics were degraded inversely when a titanium fiber was used. In the case of preparing a FRS using a titaniumadded niobium target, the characteristics improved. The discrepancy in global pinning force between monofilamentary FRS and multifilamentary FRS is also shown.<<ETX>>

Nb/sub 3/Sn artificial pinning microstructures
Extension of the APC approach to Nb/sub 3/Sn requires that a second phase be incorporated into the Nb/sub 3/Sn layer. The second phase would increase pinning strength by either reducing the grain size or by the second phase pinning the flux itself. The following criteria for elements to be candidates for the APC approach are: (1) they must form intermetallic compounds with Cu or Sn and (2) they must have negligible solubility in Cu and Nb or they must be strong oxide formers. Many of the rare earth elements satisfy these criteria. To circumvent the large strains required to produce wires with a fine distribution of the second phase, film deposition techniques have been used. Critical current densities for Nb films doped with Ti and Y are about 4000 A/mm/sup 2/ at 6T and 4.2K.

Nb/sub 3/Sn coating of high purity Nb cavities
The authors have developed a modified vapor diffusion technique using specially constructed UHV furnaces to produce uniform Nb/sub 3/Sn layers on 1 and 3GHz accelerator cavities without losing the high thermal conductivity of the Nb wall. In a first experiment with a singlecell 3GHz cavity of medium Nb purity (residual resistivity ratio, RRR=156) they have achieved E/sub acc/=10 MV/m with an 0.6 mu mthick Nb/sub 3/Sn layer. This is so far the highest accelerating field for their Nb/sub 3/Sn cavities, but it is low compared to the 25 MV/m achieved in the same cavity before coating. Possible reasons for the reduced breakdown field for Nb/sub 3/Sn are discussed on the basis of the local thermal breakdown model.<<ETX>>

Multifilamentary niobium tin solenoids
This paper describes the construction and performance of several small solenoids wound from filamentary composite wires produced by A.E.R.E., Harwell, U.K. The Nb<inf>3</inf>Sn is formed in the wire after winding by a high temperature treatment. The maximum field obtained was 12.2 Tesla, produced by placing a 9.9 Tesla Nb<inf>3</inf>Sn solenoid in the backing field of a 6.5 Tesla NbTi solenoid. The working current densities are substantially greater than those obtained with NbTi.