Nb3Sn superconducting strand development in Japan for ITER

Nishi, M.; Yoshida, Kiyoshi; Ando, T.; Takahashi, Yoshikazu; Isono, Takaaki; Nunoya, Y.; Sugimoto, Makoto; Hosono, F.; Wadayama, Yoshihide; Ogata, H.; Yasukawa, Y.; Sasaki, Tomoyuki; Tsuji, Hiroshi

doi:10.1016/s0011-2275(05)80117-1

Cited by 13 publications

(9 citation statements)

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“…the two-stage annealing favors stabilization of the nanocrystalline structure of superconducting layers. The two-staged annealing schedule applied recently to the bronze-processed wires for the ITER project was as follows: 575ºC, 150 h + 650ºC, 200 h [4,52]. However, for economic reasons it's strongly desirable to reduce the total annealing time.…”

Section: The Mechanism Of the Nb 3 Sn Layers Formation Via Diffusion ...mentioning

confidence: 99%

Morphology and Structure of Diffusion Layers in Nb<sub>3</sub>Sn-Based Superconductors of Different Geometry

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Deryagina

2015

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The evolution of structure and morphology of superconducting Nb3Sn layers forming under various regimes of the diffusion annealing in multifilamentary Nb/Cu–Sn superconductors of different design is briefly reviewed based on the authors’ (with their coauthors) original studies and the available publications. Different modes of the solid-state diffusion formation of the superconducting phase are compared. Possible mechanisms of the Nb3Sn nucleation upon the diffusion reaction of the Nb filaments and bronze matrixes are discussed. The effects of different doping elements, especially Ti, on the formation of the superconducting phase, its structure and morphology, and, consequently, on the current-carrying capacities of multifilamentary Nb3Sn-based wires are considered. Special attention is paid to the effect of the mode of Ti doping, the content of this alloying element and the regimes of the diffusion annealing on the structure, morphology and resulting performance of the bronze-processed wires with coupled Nb filaments worked out at Bochvar Institute of Inorganic Materials for the creation of International Thermonuclear Experimental Reactor.

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Section: The Mechanism Of the Nb 3 Sn Layers Formation Via Diffusion ...mentioning

confidence: 99%

Morphology and Structure of Diffusion Layers in Nb<sub>3</sub>Sn-Based Superconductors of Different Geometry

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Deryagina

2015

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“…Sieben Firmen in Europa, Japan, den USA und Russland beteiligten sich an der Produktion von insgesamt ca. 28 t Drähte, die einen Durchmesser von 0,81 mm haben (Mitchell, Besset, Shimada, 1996;Nishi et al, 1994).…”

Section: Die Erprobung Der Vorgesehenen Herstellungstechnologie Durchunclassified

ove Nachrichten

2006

Elektrotech. Inftech.

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“…Fig. 4 shows the typical relation between the hysteresis loss and critical current density of conventional Nb 3 Sn strands [11]. The higher the critical current density, the larger is the hysteresis loss.…”

Section: Nb 3 Sn Conductor Developmentmentioning

confidence: 99%

“…The target for the HP-II strand was low hysteresis loss with keeping the critical current density sufficiently high. Since the hysteresis loss is roughly proportional to the filament diameter, such high performance strand can be obtained by reducing the filament diameter to about 3-5 lm [11]. The possibility of strand breakage during drawing increases if the filament diameter is reduced because of increased reduction ratio in the diameter.…”

Section: Nb 3 Sn Conductor Developmentmentioning

confidence: 99%