CICC manufacturing technology as a factor affecting on their performance during full-size testing

CICC manufacturing technology as a factor affecting on their performance during full-size testing

The test results of the ITER toroidal field conductors demonstrated a decrease of the current sharing temperature (Tcs) with anincrease in the number of electromagnetic cycles in general. This is associating with several factors. One of them is thesuperconducting Nb3Sn filaments cracking and another one is the redistribution of the relative deformation of the Nb3Sn strandsunder Lorentz forces. Despite these factors, some conductors have shown the absence or significantly less degradation of Tcs duringelectromagnetic cycling. This article considers another possible reason for a more stable conductors Tcs behavior, namely, the localcompression of Nb3Sn wires in the cross section of a conductor. In this article presents the results of a quantitative analysis Nb3Snsuperconducting filaments cracking of strands extracted from a conductor that has passed electromagnetic cycling and the model ofa conductor compaction, as well as calculation results based on this model are presented also.

The test results of the ITER toroidal field conductors demonstrated a decrease of the current sharing temperature (Tcs) with anincrease in the number of electromagnetic cycles in general. This is associating with several factors. One of them is thesuperconducting Nb3Sn filaments cracking and another one is the redistribution of the relative deformation of the Nb3Sn strandsunder Lorentz forces. Despite these factors, some conductors have shown the absence or significantly less degradation of Tcs duringelectromagnetic cycling. This article considers another possible reason for a more stable conductors Tcs behavior, namely, the localcompression of Nb3Sn wires in the cross section of a conductor. In this article presents the results of a quantitative analysis Nb3Snsuperconducting filaments cracking of strands extracted from a conductor that has passed electromagnetic cycling and the model ofa conductor compaction, as well as calculation results based on this model are presented also.