| Autor: |
Moros Alice, Ortino Mattia, Pfeiffer Stephan, Löffler Stefan, Alekseev Maxim, Tsapleva Anastasia, Lukyanov Pavel, Abdyukhanov Ildar, Pantsyrny Victor, Bordini Bernardo, Ballarino Amalia, Hopkins Simon, C., Stöger-Pollach Michael, Johannes, Bernardi, Eisterer Michael |
| Rok vydání: |
2019 |
| Zdroj: |
EUCAS2019 |
| DOI: |
10.5281/zenodo.3572254 |
| Popis: |
A key requirement for the realization of the CERN FCC is the development of high-field superconducting dipole magnets. Considering that Nb3Sn is currently the best candidate material (with the related requirements of non-Cu JC = 1.5 kA/mm2 at 16 T and 4.2 K), a new cluster layout of prototype internal tin Nb3Sn wires, manufactured by the Bochvar Institute, was analyzed and compared first to a standard layout produced with the same heat treatment by the same manufacturer, then to a standard rod restack processed (RRP) and a powder in tube (PIT) (4) wire produced by other manufacturers. The chemical composition and microstructure investigation is an important contribution to better understand which directions should be followed in the manufacturing process for producing wires with higher performance. In this study, the homogeneity of elemental concentrations all over the wire cross section is discussed and compared for different wires, with a main focus on the Sn distribution. For this purpose, energy dispersive X-ray (EDX) spectroscopy was employed by using a scanning electron microscope(SEM) and, in particular, EDX line scans were performed all over the wire sub-elements, from the Nb barrier in the peripheral region to the Cu-Sn core. The connections between the Sn concentration gradient analysis and the wires magnetic and superconducting properties measured by SQUID magnetometry and scanning Hall probe microscopy are discussed as well. This work is part of the Marie Skłodowska-Curie Action EASITrain, funded by the European Union’s H2020 Framework Programme under grant agreement no. 764879. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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