Conveners
M1PoD - NbTi/Nb3Sn/A15 Processing & Properties II
- Lance Cooley (FNAL)
- Michael Eisterer (TU Wien, Atominstitut)
Tube type Nb3Sn conductor has been being explored by Hyper Tech Research Inc. Our standard conductor with 217 filament arrays have been generated with 12 T non-Cu Jc values of about 2400-2500 A/mm2 with filament size of 40 micros at the 0.85 mm strand. We also made 547 filament conductor which has filament size of 25 micros at the 0.85 mm strand without any drawing issue. We are working to...
Nb3Sn wire used in accelerator magnets is purchased with a typical specification that copper residual resistivity ratio RRR should be >150, to assure that magnets have adequate thermal conductivity for quench protection. While the primary intention of the specification is to control internal contamination of copper by tin, what is not controlled is external contamination. Standard practice...
Traditionally either Niobium, Tantalum or a combination of both have been used as diffusion barriers in Nb3Sn Multi-filament wire. Vanadium has also been used successfully but the ultimate RRR of the copper is limited unless an external shell of Niobium is included. Niobium is preferred over Tantalum when alternating current losses are not an issue as the Niobium is more ductile but will...
This work aims to improve stability of Nb3Sn superconducting wires and magnets by increasing specific heat of Nb3Sn conductors. A technique is put forward to introduce substances with high specific heat (e.g., Gd2O3, whose specific heat capacities are hundreds of times larger than those of Nb3Sn wires at ≤5 K) to Nb3Sn wires. This technique is well compatible with present Nb3Sn wire...
In this work we explore the development of an optimum high-Jc multifilamentary (Nb,Ti)3Sn wire containing ZrO2 APCs. First, 61-filament powder-in-tube (PIT) wires containing oxide powders were explored. These wires consist of a Nb-1%Zr tube containing Cu, Sn, and oxide powders. SnO2 and CuO powders were used, and SnO2 was found to release oxygen more readily. These samples were heat-treated at...
The n value of wire in channel (WIC) NbTi superconductor wires represents the deformation uniformity of internal filament, which is one of the most important properties of superconductor wire. This paper studies the influence of processing methods and test methods on the n value of WIC superconductor wire.
In the processing methods, the filaments positions, filament diameters, twist pitch and...
