INTERNAL TIN Nb{sub 3}Sn CONDUCTORS FOR PARTICLE ACCELERATOR AND FUSION APPLICATIONS
- Oxford Instruments, Superconducting Technology Carteret, NJ, 07008 (United States)
The past several years have seen a significant improvement in the maximum critical current density (J{sub c}) in Nb{sub 3}Sn strand. However for many applications, parameters besides high J{sub c} values are paramount. For fusion applications such as ITER, we have developed single-barrier internal tin strands having non-Cu J{sub c} values over 1000 A/mm{sup 2} (12 T, 4.2 K) with hysteresis losses less than 1000 mJ/cm{sup 3}. Our most recent results are presented, with the goal of maintaining the high J{sub c} but further reducing the losses. For high field magnet applications, higher J{sub c} values are obtained using a distributed barrier approach. Results will be presented on a new high J{sub c} Nb{sub 3}Sn strand that is made with (Nb,Ti){sub 3}Sn instead of (Nb,Ta){sub 3}Sn. This (Nb,Ti){sub 3}Sn strand has a J{sub c} value of 3000 A/mm{sup 2} (12 T, 4.2 K), but has improved higher field performance compared with our standard (Nb,Ta){sub 3}Sn material, reaching 1700 A/mm{sup 2} at 15 T, with further optimizations perhaps still possible. To reduce the effective filament diameter in these high J{sub c} strands, the number of subelement rods incorporated into the final restack billet needs to be increased from the 61 that was standard over the past several years. Results will be presented from manufacturing campaigns with 91 and 127 stack billet configurations.
- OSTI ID:
- 21136741
- Journal Information:
- AIP Conference Proceedings, Vol. 986, Issue 1; Conference: International Cryogenic Materials Conference - ICMC, Vol. 54: Advances in cryogenic engineering materials, Chattanooga, TN (United States), 16-20 Jul 2007; Other Information: DOI: 10.1063/1.2900351; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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