Journal
PROCEEDINGS OF THE 25TH INTERNATIONAL CRYOGENIC ENGINEERING CONFERENCE AND INTERNATIONAL CRYOGENIC MATERIALS CONFERENCE 2014
Volume 67, Issue -, Pages 914-919Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.phpro.2015.06.154
Keywords
ITER TF conductors; Nb3Sn strand; microstructure; cracks
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The study of defects generated in superconducting filaments of Nb3Sn strands under electromagnetic and thermal cycling was carried out for the TFRF3 cable-in-conduit-conductor ( CICC) sample that passed final testing in the SULTAN test facility. The TFRF3 sample was manufactured for the qualification of the RF Toroidal Field ( TF) CICC. The strand samples were taken from different locations in the cross-section of TFRF3 and different positions along its axis in relation to background magnetic field. Qualitative and quantitative analysis of defects were carried out using metallographic analysis of images obtained by Laser Scanning Microscope. We analyzed number, type, and distribution of defects in filaments of the Nb3Sn strand samples extracted from different petals of TFRF3 in dependence on the strand location in the cross-section ( the center of petal, nearby the spiral, nearby the outer jacket) in the high field zone ( HFZ). The results about the defects amount and their distribution are presented and discussed. (C) 2015 The Authors. Published by Elsevier B.V.
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