Conveners
Wed-Af-Po3.21 - Nb3Sn Wires
- Ildar Abdyukhanov (VNIINM (Bochvar Institute))
- Matthias Mentink (CERN)
The internal oxidation technique could generate oxide nano particles in Nb3Sn strands, which could significantly refine the Nb3Sn grain size and boost the high-field critical current density. Our recent Ta doped ternary APC Nb3Sn wires with ZrO2 pinning center demonstrated substantial grain refinement and significantly increased Jc,nonCu, while retaining the high Bc2 values of the best...
The generation of nano-scale precipitates from an additional alloying component in the Nb-alloy precursor of Nb3Sn-based wires is considered one of the promising techniques to refine the grain size of the superconducting phase and boost the Jc beyond the specification of a Future Circular Collider (FCC). Much effort by research groups could demonstrate that this technology is viable and can...
The degradations of superconducting properties due to the loading of mechanical stress and strain on the practical Nb3Sn wire are serious problem to apply for the future fusion magnet operated under higher electromagnetic force. Recently, we investigated the internal reinforcement method without reinforcement material using Cu-Sn ternary alloy matrix and found that mechanical strength of...
Nb$_3$Sn superconductor is expected to play a vital role even for next generation high field applications. However, the $J_\mathrm{c}$ is approaching to be fully optimized in terms of cross sectional layout and heat treatment condition. Therefore, some drastic solutions are needed for further improvement in $J_\mathrm{c}$.
We have been studying the effect of the element addition to the...
As a new approach to enhance the Jc property, we have been studying the element addition into the Cu matrix in the internal tin Nb3Sn conductors. We have shown so far that Zn addition promotes the Nb3Sn layer formation, compared to the non-doped Cu matrix Nb3Sn wires.
In this work, we concentrated to investigate the effect of Zn addition on the microstructure during the heat treatment in...
State-of-art magnetic systems of high-energy physics devices require magnetic fields up to 16 T. Attaining the level of fields in the range of 14-16 T is challenging for Nb3Sn superconductors used for such magnets. In order to increase their critical current density in high fields by optimization of the pinning through the modification of the microstructure of the Nb3Sn filaments, doping...
The bronze-processed Cu-Nb/Nb3Sn wires, composed of the Nb-rod-method Cu-Nb reinforcing stabilizer around the Nb3Sn filament bundle, have superior mechanical strength at both low temperature and room temperature after Nb3Sn creation heat-treatment. Therefore, in react-and-wind (R&W) process, the Cu-Nb/Nb3Sn wires are able to be handled easily with applying strains not to exceed the...
High performance Nb3Sn superconducting wires, which have high critical current density and low hysteresis loss, are desired for high-field magnet systems. To meet the requirements, investigations on increasing the Sn concentration in the bronze matrix, improving arrangement of Nb filaments and examining a new design of diffusion barrier were carried out. Wires with critical current at 4.2K and...
Nb3Sn strand have significant applications in constructing high-field (> 10 T) magnets and has great potential value in the next 20 years. Internal-tin (IT) Nb3Sn strand has been developed by many methods for the future fusion reactor after ITER with low hysteresis loss. However, how to improve the current densities of Nb3Sn strand has been becoming an important problem with the increasing...
For developing 14 Tesla whole body superconducting magnetic resonance imaging (MRI) magnet, a new kind of composite conductor has been preliminary deigned. In current design, a structure of Nb3Sn Rutherford cable-in-channel (RIC) conductor is adopted which is similar to Iseult 11.7T MRI conductor. The composite conductor consists of Rutherford cable and cooper stabilizer with channel....
NbTi-based superconducting undulators have been developed and proven to increase the brightness by an order of magnitude at high x-ray energies at the ANL Advanced Photon Source (APS). Nb3Sn has the potential to further enhance the performance of SCUs. These Nb3Sn undulators operate at maximum on-conductor field ranges between 4 T and 6 T; such comparatively low field values present stability...
