NIFS-MEMO-20

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Author(s):

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ܽ
(Eds.) K.Tachikawa and J. Yamamoto

Title:

ͻʳظ궦Ʊ
ͻϧĶƳƳΡĴ 1 Nb_3SnĶƳƳ
Studies on Advanced Superconductors for Fusion Device Part 1 -Present Status of Nb_3 Sn Conductors-

Date of publication:

Mar. 1996

Key words:

superconductor, Nb_3Sn, fusion, high magnetic field, critical current, AC loss, stress-strain effect, irradiation effeet

Abstract:

Nb_3Sn conductors have been developed with great expectation as an advanced high-field superconductor to be used in fusion devices of next generation. Furtherrnore, Nb_3Sn conductors are being developed for NMR magnet and superconducting generator as well as for cryogen-free superconducting magnet. A variety of fabrication procedures, such as bronze process, internal tin process and Nb tube method, have been developed based on the diffusion reaction. Recently, Nb_3Sn conductors with ultra-thin filaments have been fabricated for AC use. Both high-field and AC performances of Nb_3Sn conductors have been significantly improved by alloying addition. The Ti-doped Nb_3Sn conductor has generated 21.5T at 1.8K operation. This report summarizes manufacturing procedures, superconducting performances and applications of Nb_3Sn conductors fabricated through different processcs in different countries. More detailed subjects included in this report are high-field properties, AC properties, conductors for fusion with large current capacities, stress-strain effect and irradiation effect as well as standardization of critical current measurement method regarding to Nb_3Sn conductors. Comprehensive grasp on the present status of Nb_3Sn conductors provided by this report will act as a useful data base for the future planning of fusion devices.

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