Development of Ag-sheathed Bi-2223 superconducting wires and their applications

Hayashi, Kazuhiko; Hikata, Takeshi; Kaneko, Tetsuyuki; Ueyama, M.; Mikumo, A.; Ayai, N.; Kobayashi, Shinichi; Takei, H.; Sato, K.

doi:10.1109/77.919763

Cited by 33 publications

(10 citation statements)

References 5 publications

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“…Although the development of the BSCCO tapes was preceded [11,12], a large-scaled development of CCs was started in FY1999 as the national project in Japan with expectation of the high potential of REBCO material [5,8,10]. Through the development of CCs of ten years, a length (L) and a critical current (I c ) had been drastically improved and the reasonable long tapes with high performance typically such as 200m-200 A/cm-width could be prepared [5,9,10].…”

Section: Introductionmentioning

confidence: 99%

“…Since the discovery of a high temperature superconductor [1][2][3], lots of effort has been made to realize the HTS applications [4][5][6][7][8][9][10][11][12][13][14][15]. Among the applications, those using the HTS tape are expected as the promising ones, since the tapes could give a flexible shape for variable performances corresponding to the applications.…”

Section: Introductionmentioning

confidence: 99%

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Progress in R＆D of coated conductor in M-PACC project

Izumi¹,

Ibi²,

Nakaoka³

et al. 2014

Progress in Superconductivity and Cryogenics

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The five-year national project in Japan for R&D of coated conductors and applications, named as the Materials and Power Applications of Coated Conductors (M-PACC) project, was finished at the end of FY2013. The project consists of four sub-themes as cable, transformer, SMES and coated conductors. In the theme of coated conductors, the fabrication process had been developed to satisfy the requirements from the applications such as in-field I c performance, low AC loss in the long tapes etc. Through the project, the remarkable progress was achieved as follows; a high in-field minimum I c value over 54A/cm-width under 3T at 77K was realized in a 200m long EuBCO tape with artificial pinning centers of BaHfO 3 by the pulsed laser deposition (PLD) technique on the IBAD template. On the other hand, the AC loss reduction was confirmed in the tapes fabricated by both PLD and the metal organic deposition (MOD) techniques by scribing 100m tapes into 10-filamments. Additionally, the mechanism of the delamination phenomenon was systematically investigated and the strength was improved by eliminating the origins of the weak points in the films. Through the development, all targeted goals were accomplished and the several results were appreciated as a world champion data.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Progress in R＆D of coated conductor in M-PACC project

Izumi¹,

Ibi²,

Nakaoka³

et al. 2014

Progress in Superconductivity and Cryogenics

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“…where B = (B x , B y , 0) and H = (H x , H y , 0) are the magnetic flux density and the magnetic field strength, E = (0, 0, E) and J = (0, 0, J) the electric field and the current density, respectively, and ∇ = (∂/∂x, ∂/∂y, 0). In (2), the term for a displacement current is ignored as usual. Furthermore, the following relationships are widely used as constitutive equations with the permeability and resistivity of material, µ and ρ.…”

Section: A Governing Equationmentioning

confidence: 99%

“…Since the winding carrying a transport current is simultaneously exposed to an external magnetic field due to the currents in the others, it is necessary to evaluate the ac losses under these realistic situations. Furthermore, the HTS wires developed recently are produced in the form of a flat tape to improve their critical current densities [1], [2], and therefore they have anisotropy with respect to the direction of external magnetic field [3], [4]. Thus the electromagnetic properties of HTS wires are quite complicated, and it has been very useful to estimate the ac losses numerically, especially with finite element methods (FEMs) [5]- [11].…”

Section: Introductionmentioning

confidence: 99%

Numerical evaluation of AC losses in HTS wires with 2D FEM formulated by self magnetic field

Komori

Hayashi

Yoshida

et al. 2003

IEEE Trans. Appl. Supercond.

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The ac losses of high critical-temperature superconducting (HTS) wires are numerically calculated by means of a finite element method (FEM), which is formulated with a self magnetic field due to an induced current as unknown. The numerical model is straight HTS wires carrying an alternating transport current in an external ac magnetic field perpendicular to the wire axis. In this situation, the electromagnetic field around the wires is given by two-dimensional (2D) Maxwell's equations. It is also assumed that the transport property is represented by either the critical state model or the power-law model, in which the electric field is proportional to the power of the current density. The obtained losses are compared with conventional theoretical curves in several simple geometries.

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“…Properties of Bi-system superconductors such as Bi 2 Sr 2 Ca 2 -Cu 3 O y (Bi2223) have firstly achieved a practical application level among the high temperature superconductors [4]. Many applications such as magnets have been demonstrated using the silver sheathed wires of Bi-system superconductors fabricated by the conventional powder-in-tube (PIT) method [5,6]. However, the Bi-system wires have several disadvantages such as a low critical current density (J c ) under magnetic fields which limits their usage only below 20 K [7].…”

Section: Introductionmentioning

confidence: 99%