Nb 3 Sn LQStrand Specification Oxford Superconducting Technology

Nb 3 Sn LQ-Strand Specification • Oxford Superconducting Technology, OST • High Jc production wire • Rod Re-Stack Process, RRP® 54/61 Design “Baseline Strand”- Specs. LARP DOE Review July 15 -16, 2010 Conductor and Cable - A. Ghosh 1

Nb 3 Sn HQ-Strand Specification “New Baseline Strand” RRP 108/127 with increased Copper 127 LARP DOE Review July 15 -16, 2010 Conductor and Cable - A. Ghosh 2

Although Jc is similar for 54/61 and 108/127 LARP DOE Review July 15 -16, 2010 Conductor and Cable - A. Ghosh 3

Ic is lower for the 108/127 Increased Copper spacing and increasing number of sub-elements leads to higher copper content and lower Ic LARP DOE Review July 15 -16, 2010 Conductor and Cable - A. Ghosh 4

Impact on Magnet SSL HQS 01 a C 01, C 02 54/61 C 03, C 04 108/127 LARP DOE Review July 15 -16, 2010 Conductor and Cable - A. Ghosh 5

3. RRP 54/61, 0. 7 mm LARP Production at OST First 8 billets Next 9 billets Production improved over time • 650 kg of wire delivered in FY 07 -FY 09 • 93 % in lengths >1 Km, 73% in lengths >3 km, 29% >10 km LARP DOE Review July 15 -16, 2010 Conductor and Cable - A. Ghosh 6

8 billets RRP 108/127 Production at OST 127 Production is good, but billet yield not as good as 54/61 • 245 kg of wire produced so far from 8 billets, single billet yield is ~ 35 kg (~7. 5 km) • 85 % in lengths >1 Km, 43% in lengths >3 km, 26% >5 km LARP DOE Review July 15 -16, 2010 Conductor and Cable - A. Ghosh 7

6. Procurement – Planning for Long HQ Strand Lead time is 12 -15 months LARP 1360 kg FY 08 180 kg 108/127 FY 09 224 kg 108/127 FY 10 300 kg 108/127 FY 11 300 kg 108/127 Additional 395 kg OST is currently producing ~ 1200 kg/month of Nb 3 Sn LARP production is parallel to ITER wire production LARP DOE Review July 15 -16, 2010 Conductor and Cable - A. Ghosh 8

Conductor Inventory Status In-stock • 78 kg of 54/61 - 0. 7 mm • 54 kg of 108/127 – 0. 8 mm for HQ Future Delivery of RRP 108/127 • 68 kg in Aug’ 10 • 67 kg in Dec’ 10 430 kg • 180 kg in Feb’ 11 • 115 kg in Mar’ 11 Planned Delivery • 125 kg in June’ 11 • 265 kg in Aug’ 11 • 300 kg in Dec’ 11 LARP DOE Review July 15 -16, 2010 695 kg Conductor and Cable - A. Ghosh 9

Strand inventory and usage HQ- C 11, C 12 and C 13 uses annealed 54/61 wire. C 13 with SS-core HQ- C 14 uses CDP wire Ti-doped LARP DOE Review July 15 -16, 2010 Conductor and Cable - A. Ghosh 10