Magnetic structural analysis of nanocrystalline soft magnets by small-angle neutron scattering

Mamiya, Hiroaki*; Oba, Yojiro; Hiroi, Kosuke; Miyatake, Takayuki*; Gautam, R.*; Sepehri-Amin, H.*; Okubo, Tadakatsu*

IEEE Magnetics Letters, 14, p.7100105_1 - 7100105_5, 2023/02

https://doi.org/10.1109/LMAG.2023.3242108

Influence of wire parameters on critical current versus strain characteristics of bronze processed NbSn superconducting wires

Miyatake, Takayuki*; Murakami, Yukinobu*; Kurahashi, Hidefumi*; Hayashi, Seiji*; Zaitsu, Kyoji*; Seeber, B.*; Mondonico, G.*; Nabara, Yoshihiro

IEEE Transactions on Applied Superconductivity, 22(3), p.4805005_1 - 4805005_5, 2012/06

https://doi.org/10.1109/TASC.2011.2179697

In order to develop bronze processed NbSn strands for ITER TF and CS coils, the influences of various parameters of NbSn strands such as filament diameter, barrier materials, barrier thickness, heat treatment pattern and Ti addition on critical current () vs. axial strain characteristics were investigated. The change of theses parameters brought significant changes to superconducting properties involving and n-value at zero applied strain. In spite of different strand parameters, the strain dependency of normalized was almost the same, except for Ti-addition affecting the critical field . Based on the results, bronze processed NbSn strands with non-Cu critical current density more than 1,100 A/mm at 12T, 4.2K have been successfully developed for the CS coil.

Preparation for ITER CS conductor fabrication

Hamada, Kazuya; Nunoya, Yoshihiko; Takahashi, Yoshikazu; Isono, Takaaki; Nabara, Yoshihiro; Hemmi, Tsutomu; Matsui, Kunihiro; Kawano, Katsumi; Ebisawa, Noboru; Oshikiri, Masayuki; et al.

no journal, , 

The ITER Central Solenoid (CS) conductor is composed of 576 NbSn superconducting strands and 288 Cu strands assembled together into a multistage cable and protected by a circle-in-square jacket with the outer dimension of 49 mm 49 mm. In R&D to prepare for the ITER CS conductor manufacturing, full size conductor performance test and jacket welding test and mechanical tests have been performed. In the presentation, the R&D activities are presented, showing that as a result of this R&D, the CS conductor manufacturing technologies have been confirmed to start the procurement of the CS conductor.