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High-temperature Superconducting Wire Group

Superconducting technologies are expected to reduce the energy consumption. A high-temperature superconductor (HTS) is a material with a superconducting transition temperature above 25 K. Since HTS materials perform well at 77 K (the boiling point of nitrogen) and has a high potential at low temperatures under high magnetic fields, they enable superconducting cables to be operated in a liquid- nitrogen cooling and superconducting magnet system without the use of expensive liquid helium. Our research focuses on improving the properties of HTS materials (especially their current carrying capacity) and developing technologies that promote HTS applications.

Objective

"The critical current density (Jc) of the Bi,Pb-2223 superconducting thin films fabricated herein is 10 times higher than that of the commercially produced superconducting filament." Image

The critical current density (Jc) of the Bi,Pb-2223 superconducting thin films fabricated herein is 10 times higher than that of the commercially produced superconducting filament.


"Jc-H-T properties of the MgB2 superconducting wires. The Jc of the NIMS-MgB2 wire far exceeds that of the commercially available wire." Image

Jc-H-T properties of the MgB2 superconducting wires. The Jc of the NIMS-MgB2 wire far exceeds that of the commercially available wire.


"The Bi-2223 magnet system in liquid nitrogen operation. This system, which is applied in our own research activities, enables the detailed characterization of superconducting wires." Image

The Bi-2223 magnet system in liquid nitrogen operation. This system, which is applied in our own research activities, enables the detailed characterization of superconducting wires.


Primarily, we are investigating Bi-oxide cuprate, MgB2, and Fe-system HTSs and developing HTS magnet technologies. Bi-2223 HTS was discovered at National Institute of Material Science (NIMS) and is already being produced industrially in wire. To better understand the superconductor phase evolution that leads to a large increase in the current carrying capacity of Bi-2223 HTS, we are conducting thin-film studies on this material. We are also developing a wire fabrication process for MgB2 and Fe-system compound and various element technologies for magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR) magnets requiring very high stability and reliability.


Facilities

"Superconducting magnet for critical current density evaluation at various temperatures and magnetic fields." Image

Superconducting magnet for critical current density evaluation at various temperatures and magnetic fields.


"Rolling, drawing, and swaging machines for manufacturing wires and tapes" Image

Rolling, drawing, and swaging machines for manufacturing wires and tapes


Our wire processing facilities include drawing, pressing, rolling, and swaging machines. We also possess extensive characterization equipment such as scanning electron microscopes (SEM), optical microscopes (OM), thermogravimetry-differential thermal analysis apparatus (TG-DTA), X-ray diffraction equipment (XRD), and inductively coupled plasma equipment (ICP).


Selected Recent Results

・Our NMR equipment achieved the world’s highest magnetic field to date (1020 MHz) and consequently won the “Award on Superconductivity Science and Technology.”

・Our superconductive NMR magnet has achieved the highest magnetic field (1020 MHz = 24.0 T) in NMR reported to date.

"The 1.02-GHz NMR system constructed by the NIMS group" Image

The 1.02-GHz NMR system constructed by the NIMS group




Recent Progress of HTS

Bi system superconductor discovered by National Institute for Materials Science (Old National Research Institute for Metals) are now used for practical applications such as electric power cable and high field magnets.

・The achieved magnetic field (27.6 T) surpasses all previously achieved fields.
(http://www.nims.go.jp/news/archive/2016/04/201604110.html)
・A 1.02-GHz NMR system has been developed
(http://www.nims.go.jp/eng/news/press/2015/07/201507010.html)
・A magnet system using liquid nitrogen has been developed
・HTS superconductive wire rods have been applied to a railroad cable system
(http://www.rtri.or.jp/rd/division/rd49/rd4940/rd49400109.html)


Inquiry about this page

High-temperature Superconducting Wire Group
1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047 JAPAN
E-Mail: KITAGUCHI.Hitoshi=nims.go.jp(Please change "=" to "@")