Evaluation of Bending Strain in Nb3Sn Strands of CIC Conductor Using Neutron Diffraction
| Autor: | Tomone Suwa, Hideki Kajitani, Kozo Osamura, Stefanus Harjo, Toru Saito, Tsutomu Hemmi, Norikiyo Koizumi, Kazuya Aizawa |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Strain (chemistry) Neutron diffraction Bending Condensed Matter Physics 01 natural sciences Electronic Optical and Magnetic Materials Conductor Transverse plane Nuclear magnetic resonance Deflection (engineering) 0103 physical sciences Electrical and Electronic Engineering Composite material 010306 general physics Penetration depth Electrical conductor |
| Zdroj: | IEEE Transactions on Applied Superconductivity. 27:1-5 |
| ISSN: | 1558-2515 1051-8223 |
| Popis: | The superconducting property of Nb 3 Sn strands is very sensitive to strain. The transverse electromagnetic loading has been considered as a major origin of the degradation of Nb 3 Sn cable-in-conduit conductors (CICCs) due to the local bending. Since the bending pitch is around 5 mm due to contacting of strands compacted by the electromagnetic transverse loading, there is a possibility of a large bending strain with small deflection of strands. The bending strain of the strands cannot be evaluated from only the small deflection obtained visually. Measuring bending strain of Nb 3 Sn strand in CICCs is important for evaluating the conductor performance. Neutrons, which have a large penetration depth, are a powerful tool to evaluate the internal strain of Nb 3 Sn in the CICC. This paper shows that the bending strain in Nb 3 Sn strands of CICCs can be determined by the neutron diffraction profile nondestructively and quantitatively. |
| Databáze: | OpenAIRE |
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