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v3.3.2
Speaker: Alice Moros
Abstract:
Artificial Pinning Center (APC) Nb3Sn wires became of great interest in the superconductivity community due to their high superconducting performance capable of reaching the CERN FCC-hh target.
In the starting layout of internally oxidized ternary APC wires, filaments consist of Cu-clad Nb-Ta-Zr or Nb-Ta-Hf tubes filled with a mixture of Sn, Cu, and oxide powders. The strand is heat-treated in such a way that first O and then Sn diffuses into the Nb alloy to form Nb3Sn. ZrO2 or HfO2 nanoprecipitates occur during diffusion due to insolubility of O in Nb3Sn. Such precipitates are the main ingredient of this wire type as they can inhibit grain growth and work as point-type flux pins contributing to their high-performing Jc. The exploration of the physics behind their outstanding Jc values aims for further optimization to make APC Nb3Sn the superconductor of the future.
This talk presents an overview of a microstructural investigation carried out on APC wires reacted with different HTs. The main objective of this study is to understand the correlations between the size and density of ZrO2 and HfO2 nanoprecipitates and the performed HT. Analyzing the behaviour of the nanoprecipitates according to different HTs is key to further improving the performance of this promising conductor type.
Ian Pong