Development of Superconducting Wires for Fusion Application
Five Nb3Sn strands have been processed to achieve the compromise between high current density and low hysteresis losses. This work was performed in the framework of Phase II ITER program. Kilometric lengths have been industrially manufactured. As a result, Jcnon Cu (4.2K, 12T) up to 670 A/mm2 with non Cu hysteresis losses (±3T) of 590 mJ/cm3 have been measured. However superconducting properties should be enhanced by using heat treatments adapted to the specific strand design. Cr diffusion was identified as the major cause of RRR degradation. Feasibility of NbTi45.6wt% wires with an intermediate resistive barrier for poloidal coils is also demonstrated.
KeywordsHeat Treatment Hysteresis Loss Filament Diameter Eddy Current Test High Critical Current Density
Unable to display preview. Download preview PDF.
- 1.J.L. DUCHATEAU, T. SCHILD, D. CYAZYNSKI, H. TEN KATE. “Coupling Losses of Fusion Conductors: Influence of some Design Parameters” to be published in Adv. Cryo. Eng. (1995).Google Scholar
- 2.E. GREGORY, G.M. OZERYANSKY AND B.A. ZEITLIN “Improvement of the Structure and Properties of Internal Tin Nb3Sn Conductors”. Adv. Cryo. Eng. Vol. 38 p 578 (1992)Google Scholar
- 4.K. KAMATA, H. MORIAI, N. TADA, T. FUJINAGA. “Manufacturing of Titanium-Bronze Processed Multifilamentary Nb3Sn Conductor”. IEEE TRANS. MAG. Vol. MAG 21 N° 2 (March 1995).Google Scholar
- 5.C. VERWEARDE — R. TAILLARD — C.E. BRUZEK. “Quantity and Quality of the Nb3Sn Intermetallics Formed by the the Internal Tin Process” to be published in Adv. Cryo. Eng. (1995).Google Scholar
- 6.R. SCHWALL, G.M. OZERYANSKY, D.W. HAZELTON, S.F. COGAN, R.A. ROSE. “Properties and Peformances of High Current Density in Core Process MF Nb3Sn”. IEEE TRANS. MAG. Vol. 19 N°3 (May 1983).Google Scholar
- 7.W. SCHELB. “Electron Microscopic Examination of Multifilamentary Bronze-Processed Nb3Sn” J. App. Mat. Sc (16) P. 2575–2582 (1981).Google Scholar
- 8.M.N. WILSON. “Superconducting Magnets” Clarendow Press. Oxford (1988).Google Scholar