Russian Scientific Research and Development Cable Institute (known by Russian abbreviation as VNIIKP) has been participating in ITER project since 1993 both at the early stage of Research and Development (R&D) and at the following stage of Engineering Design Activity (EDA). Tests of several short samples at Sultan test facility were crowned by successful testing of Toroidal Field (TF) and Poloidal Field (PF) insert coils performed in Japan in 2001 and 2008 correspondingly. Now VNIIKP is actively implementing the final production and delivery stage. By 2009 the full technological complex has been accomplished to produce PF cables for both the Russian Federation (RF) and European parts and TF conductors for RF part. In this review we present a short history of VNIIKP participation in ITER and our current achievements. The technology used and our production line are described in some detail.
The study of defects generated in superconducting filaments of Nb 3 Sn 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 Nb 3 Sn 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.
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