Heat Treatment Optimization Studies on PIT Strand for the NED Project

For the Next European Dipole (NED) program, a Powder-In-Tube (PIT) strand was successfully developed by SMI. This high-performance Nb 3 Sn strand presents a non-copper critical current density of ~ 2500 A/mm 2 at 12 T applied field and 4.2 K and a filament diameter around 50 mum. Extensive heat trea...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2009-06, Vol.19 (3), p.2564-2567
Main Authors: Boutboul, T., Oberli, L., den Ouden, A., Pedrini, D., Seeber, B., Volpini, G.
Format: Article
Language:English
Subjects:
Critical current
Critical current density
Heat treatment
Low-temperature superconductors
Magnetic field measurement
Niobium compounds
Superconducting filaments and wires
Superconducting magnets
superconducting materials measurements
superconducting wires
Superconductivity
Temperature
Tin
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:For the Next European Dipole (NED) program, a Powder-In-Tube (PIT) strand was successfully developed by SMI. This high-performance Nb 3 Sn strand presents a non-copper critical current density of ~ 2500 A/mm 2 at 12 T applied field and 4.2 K and a filament diameter around 50 mum. Extensive heat treatment optimization studies were performed in order to maximize both critical current and RRR, with a plateau temperature down to 625degC and duration up to 400 hours. It appears that a critical current enhancement of ~ 10% can be achieved for a reaction schedule of 320 hours at 625degC with non-copper critical current density respectively exceeding 2700 and 1500 A/mm 2 at 12 and 15 T (4.2 K). Thanks to this modified heat treatment, this strand completely fulfills the NED stringent specification.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2009.2019017