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The costs and properties of NbTi and Nb(3)Sn wire for the construction of superconducting magnets for fusion purposes are compared. NbTi wire is widely available commercially, whereas Nb(3)Sn wire is produced by one manufacturer in Europe by the bronze route process and by two in the United States using the internal tin diffusion process, which is much cheaper than the bronze route. The cost of NbTi strand for a magnet may be cheaper than Nb(3)Sn by a factor of 2 to 4. Bronze route Nb(3)Sn exhibits extreme brittleness and strain sensitivity, whereas NbTi shows almost no strain degradation at all. The main problems of the internal tin Nb(3)Sn seem to be high magnetisation, high hysteresis losses and low residual resistivity ratio of the stabilising copper.

Additional information

Authors: PÖHLCHEN R, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-R(91)04 EN (1991) 9 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199110882 / Last updated on: 1994-12-02
Original language: en
Available languages: en