Abstract
The modeling of the effects of bending on single Nb3Sn strand DC performance (IC, n index) is presented for a bronze-route strand subjected to the same loading conditions as in an experiment performed at JAEA Naka, Japan [Y. Nunoya, et al., IEEE TAS 14 (2004) 1468-1472]. The strand is discretized in strand elements (SE) representing groups of twisted filaments in the bronze matrix, and in portions of the outer Cu annulus, electro-magnetically coupled in the THELMA code. The 3-D strain map in the filament region is computed with a newly developed, detailed thermo-mechanical model accounting for non-linear, temperature dependent material characteristics. With respect to our previous analysis [P.L.Ribani, et al., IEEE TAS 16 (2006) 860-863] several new updated ingredients, besides the new thermo-mechanical model, are used here, including more accurate thermal and mechanical properties for the materials, a jacket-like model for the outer Cu layer, IC and n index (interpolative) scaling from Durham University. The simulation results show an improved agreement with the experiments, in the degradation of the single-strand performance due to bending.
Original language | English (US) |
---|---|
Article number | 4523031 |
Pages (from-to) | 1067-1071 |
Number of pages | 5 |
Journal | IEEE Transactions on Applied Superconductivity |
Volume | 18 |
Issue number | 2 |
DOIs | |
State | Published - Jun 1 2008 |
Keywords
- Fusion reactors
- ITER
- Modeling
- Superconducting filaments and wires
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Physics and Astronomy (miscellaneous)