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Xplore Articles related to Superconducting Filaments And Wires

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Pro's and con's on a superconducting memory

1959 IEEE International Solid-State Circuits Conference. Digest of Technical Papers, 1959

The most direct way to attain a faster computer is to increase speed of the random-access memory (RAM). In this connection, application of the principles of superconductivity to memory to attain rapid switching times is currently being givcn serious cousideration. This report covers the advantages and disadvantages experienced during our investigations on 8 x 8 memory planes.


Breakdown characteristics of pressurized liquid helium under quench condition of superconducting wires

Conference Record of the 1998 IEEE International Symposium on Electrical Insulation (Cat. No.98CH36239), 1998

For practical insulation design of superconducting power apparatus, we have been studying quench-induced dynamic breakdown and prebreakdown characteristics of liquid helium (LHe). We have already pointed out that the insulation performance of LHe may be drastically degraded in thermal bubble disturbance. In this paper, we measured breakdown and prebreakdown characteristics of pressurized LHe under quench conditions and discussed the dynamic ...


Microstructure and critical current densities of MgB/sub 2//Cu wires

IEEE Transactions on Applied Superconductivity, 2005

Cu sheathed MgB/sub 2/ wires with a diameter of 2.50 mm and 0.93 mm have been fabricated by the In-Situ Powder-in-Tube PIT method. We have studied three subjects; the morphology of the wire core affected by the fabrication process of cold rolling, compounds in the core produced by the heat-treatment and effect of the microstructure on critical current densities Jc. ...


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

IEEE Transactions on Applied Superconductivity, 2006

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 ...


Superferric model dipole magnet with the yoke at 80 K for the GSI future fast cycling synchrotron

IEEE Transactions on Applied Superconductivity, 2003

Experimental data of a fast cycling (f=1 Hz) 2T dipole magnet based on a superconducting NbTi multi filament hollow cable cooled with forced two phase helium flow at T=4.5K and iron yoke at T=80 K are presented. A new magnet design is proposed. The magnet yoke made of laminated steel consists of two parts: the internal smaller part has close ...


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Educational Resources on Superconducting Filaments And Wires

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IEEE.tv Videos

Advances in MgB2 - ASC-2014 Plenary series - 7 of 13 - Wednesday 2014/8/13
Microstructure-Property Correlations in Superconducting Wires - Applied Superconductivity Conference 2018
ASC-2014 SQUIDs 50th Anniversary: 1 of 6 Arnold Silver
Low-energy High-performance Computing based on Superconducting Technology
Superconducting Detectors for Astrophysics and Cosmology - ASC-2014 Plenary series - 9 of 13 - Thursday 2014/8/14
Superconductors for the Future from the Perspective of the Past
Super conducting Magnets at Fermilab Tevatron
Interaction of ferromagnetic and superconducting permanent magnets - superconducting levitation
Niobium Manufacturing for Superconductivity - ASC-2014 Plenary series - 5 of 13 - Tuesday 2014/8/12
Superconducting Quantum Computing in China - Applied Superconductivity Conference 2018
The Josephson Effect: The Original SQUIDs
MIRAI Program and the New Super-high Field NMR Initiative in Japan - Applied Superconductivity Conference 2018
Laser Communication From Space Using Superconducting Detectors - ASC-2014 Plenary series - 12 of 13 - Friday 2014/8/15
The Josephson Effect: SQUIDs Then and Now: From SLUGS to Axions
The Prospects for Scalable Quantum Computing with Superconducting Circuits - Applied Superconductivity Conference 2018
Superconducting quantum computing research and applications in the United States - Applied Superconductivity Conference 2018
Unconventional Superconductivity: From History to Mystery
How to Build a Superconducting Opto-Electronic Neuromorphic Computer - Sonia Buckley - ICRC 2018
Quantum Annealing: Current Status and Future Directions - Applied Superconductivity Conference 2018
Recent Research Activities of Applied Superconductivity in China

IEEE-USA E-Books

  • Pro's and con's on a superconducting memory

    The most direct way to attain a faster computer is to increase speed of the random-access memory (RAM). In this connection, application of the principles of superconductivity to memory to attain rapid switching times is currently being givcn serious cousideration. This report covers the advantages and disadvantages experienced during our investigations on 8 x 8 memory planes.

  • Breakdown characteristics of pressurized liquid helium under quench condition of superconducting wires

    For practical insulation design of superconducting power apparatus, we have been studying quench-induced dynamic breakdown and prebreakdown characteristics of liquid helium (LHe). We have already pointed out that the insulation performance of LHe may be drastically degraded in thermal bubble disturbance. In this paper, we measured breakdown and prebreakdown characteristics of pressurized LHe under quench conditions and discussed the dynamic breakdown mechanism of pressurized LHe by thermal bubble behavior and partial discharge (PD) characteristics. Experimental results revealed that the dynamic breakdown voltage of LHe at 0.2 MPa increased as high as about 3 times of that at the atmospheric pressure with reduced PD charge in the quench- induced thermal bubbles.

  • Microstructure and critical current densities of MgB/sub 2//Cu wires

    Cu sheathed MgB/sub 2/ wires with a diameter of 2.50 mm and 0.93 mm have been fabricated by the In-Situ Powder-in-Tube PIT method. We have studied three subjects; the morphology of the wire core affected by the fabrication process of cold rolling, compounds in the core produced by the heat-treatment and effect of the microstructure on critical current densities Jc. The value of Jc is 10/sup 3/ A/cm/sup 2/ in 2 T at 25 K for the wire of 2.50 mm diameter. This value is three times higher than that of the wires of 0.93 mm diameter. EDS analysis and X-ray diffraction patterns have shown that in the wire with a diameter of 0.93 mm Cu and Mg diffusion on heat-treatment process, leading to formation of Cu-Mg compounds. We have paid attention to texture change of the wire core from granular to filamentary by the cold rolling process. It has been supposed that this filamentary texture gives an effect on the formation of MgB/sub 2/ and Jc value.

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

    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

  • Superferric model dipole magnet with the yoke at 80 K for the GSI future fast cycling synchrotron

    Experimental data of a fast cycling (f=1 Hz) 2T dipole magnet based on a superconducting NbTi multi filament hollow cable cooled with forced two phase helium flow at T=4.5K and iron yoke at T=80 K are presented. A new magnet design is proposed. The magnet yoke made of laminated steel consists of two parts: the internal smaller part has close mechanical and thermal contact with the coil while the outer part is separated from the cold mass with a gap of 1 mm and cooled with liquid nitrogen.

  • AC losses in a superconductor for the quick response type 70 MW class superconducting generator

    The authors have been developing a 70 MW class model superconducting generator aiming at a 200 MW class pilot machine. The superconductor developed for the field winding of the generator has a configuration of double stranded cable, consisting of NbTi, Cu, and CuNi. Then, for the purpose of decreasing intra- strand AC losses, a strand with additional Cu-0.5 wt%Mn fins in the Cu sheath has been developed. The authors have carried out tests and analytical studies of the generator AC losses. They then compared cables with additional fins in the Cu sheath with cables without fins. The results show that both eddy current losses and coupling losses in the strands were considerably reduced by additional fins in the Cu sheath.

  • Design and fabrication of Bi-based superconducting coil

    Two prototype coils were constructed using silver-sheathed (Bi,Pb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/ superconducting wires fabricated by the powder-in-tube technique. One was designed as a coil for an iron core magnet which generated a magnetic field of 0.2 T at 77.3 K. The other was an insert coil for a hybrid magnet which generated 0.8 T in a background field of 7 T at 4.2 K. These results suggest that Bi-based superconducting coils can be used in magnet applications.<>

  • Analysis of Efficiency Characteristics of Superconducting Coil-Applied Wireless Power Transmission Systems by Transmission Distance

    A significant amount of research is being done on the commercialization of magnetic-resonance-based wireless power transmission. To this end, research on boosting transmission efficiency is essential. In this paper, a wireless power transmission system was designed using superconducting coils to boost wireless power transmission efficiency. The efficiency of a normal wireless power transmission system and a superconducting wireless power transmission system was calculated according to the transmission distance. Results confirmed that compared to the use of the ordinary conducting coil, the use of superconducting coil offered higher transmission efficiency at a farther distance.

  • Development of Nb3Sn superconducting wires for AC use

    We have fabricated the powder-metallurgy (P/M) processed Nb3Sn superconducting wires as the first trial for the development of P/M processed Nb3Sn wires for AC use. The Nb content was chosen as small as 22.5wt% so as to avoid the appearance of interfilamentary coupling inside the wire. Nevertheless, the smallest effective diameter deffobtained in the present trial was 37μm, while the average diameter of Nb3Sn filaments was 1μm. The Critical current density Jc of filamentary region was 1.7×109A/m2at 4.2K at 1T. A test coil with the coil length of 160mm, inner diameter of 34mm and outer diameter of 146.5mm was wound by a (3×7)- strand cable of P/M processed Nb3Sn wires in the wind and react method, and a pulse-mode operation was carried out. We have also fabricated the external diffusion (E/D) processed Nb3Sn multifilamentary wires to seek for another possibility for the development of Nb3Sn superconducting wires for AC uses. The wire diameter was 0.15mm, the filament diameter was 0.5μm, the number of filaments was 17935, and the twist pitch was 1mm. The overall critical current density was 1.8×109A/m2at 4.2K and 2T, which is about 3 times larger than that of the corresponding NbTi multifilamentary wires. A test coil with the coil length of 50mm, inner diameter of 20mm and outer diameter 30.4mm was also wound by 3-strand cable of E/D processed Nb3Sn wires in the wind and react method, and 60Hz operation was carried out. The present trial indicates that the superior characteristics of Nb3Sn wires such as high temperature margin and large amplitude availability compared with NbTi wires could be the additional advantageous characteristics of further developed Nb3Sn wires for AC uses.

  • Joint resistance measurement using current-comparator for superconducting wires in high magnetic field

    To assess the joint resistance between superconducting multifilamentary wires in a magnetic field, a measurement system using a current comparator has been developed for measuring the current decay induced in a superconducting loop containing a joint. It can measure both joint resistance and joint current carrying capacity up to 3000 A in a maximum magnetic field of 6.6 T. The joint resistances between superconducting wires soldered by diffusion welding and cold-pressing welding methods have been measured. The joint performance in magnetic fields of up to 6 T has been recorded.<>



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