BNL FNAL LBNL SLAC LARP Strand Status of

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BNL -FNAL - LBNL - SLAC LARP Strand: Status of 108/127 : Past and

BNL -FNAL - LBNL - SLAC LARP Strand: Status of 108/127 : Past and Present Manufacture and Performance Hi. Lumi-LHC/LARP Conductor and Cable Internal Review Oct 16 -17, 2013 By Video Arup K. Ghosh (BNL) Conductor Review Oct 16 -17, 2013 LARP Strand : Specs. Procurement, Measurement- A. Ghosh 1

Outline 1. Introduction 2. Production History of 108/127 strand 3. Performance of 108/127 a.

Outline 1. Introduction 2. Production History of 108/127 strand 3. Performance of 108/127 a. Ta-Ternary b. Ti-Ternary 4. Summary - Lessons Learned Conductor Review Oct 16 -17, 2013 LARP Strand : Specs. Procurement, Measurement- A. Ghosh 2

Introduction § 108/127, 0. 7 mm RRP® wire from Oxford Superconducting Technology first delivery

Introduction § 108/127, 0. 7 mm RRP® wire from Oxford Superconducting Technology first delivery of 90 kg in Feb 2008 under CDP contract § Used in TQS 03 – a very successful 90 mm magnet § 2009 -2012 substantial wire produced at 0. 7 mm for LQ and 0. 8 (0. 778 mm) for HQ § Ta-Ternary : (Nb – 7. 5 wt. % Ta)3 Sn § 1300 Kg produced for LARP § 108/127 Ti-Ternary : CDP development 2009 § First delivery of 3 billets at 0. 8 mm (using CDP funds) in Mar-2011 used for HQ-C 18, C 21 and a LHC coil § Good piece length § RRR in the range of 60 -70 for HT of 665°C/50 h § 410 Kg of Ti-Ternary wire delivered Sep’ 12 through Jan’ 13 § Introduced design change: 5% lower Sn content Conductor Review Oct 16 -17, 2013 LARP Strand : Specs. Procurement, Measurement- A. Ghosh 3

OST production of 108/127 for LARP Production in parallel with ITER wire Note: In

OST production of 108/127 for LARP Production in parallel with ITER wire Note: In this time frame the yield of 54/61 declined 10% Ti-ternary piece-length better than Ta-Ternary Conductor Review Oct 16 -17, 2013 LARP Strand : Specs. Procurement, Measurement- A. Ghosh 4

Performance Highlights of Ta-108/127 • OST qualified wires using the following HT schedule •

Performance Highlights of Ta-108/127 • OST qualified wires using the following HT schedule • 210°C/48 h + 400°C/48 h + 665°C/50 h • Overall, a very large fraction of the billets surpassed the Jc minimum of 2650 A/mm 2 • However, there was little manufacturing margin in meeting the RRR minimum of 60. • To meet the specs. the HT temperature had to be lowered to 650 °C/48 h or lower. • For the LQ coils (0. 7 mm) the reaction temperature was further reduced to 640 °C/48 h so that the RRR of extracted strands could be above 60, and for HQ (0. 778 mm), 650 °C/48 h was used to maintain RRR > 100. Conductor Review Oct 16 -17, 2013 LARP Strand : Specs. Procurement, Measurement- A. Ghosh 5

OST data 0. 8/0. 778 mm 108/127 strand 210 C/48 h + 400 C/48

OST data 0. 8/0. 778 mm 108/127 strand 210 C/48 h + 400 C/48 h + 665 C/50 h Aug-23, 2012 Conductor Review Oct 16 -17, 2013 LARP Strand : Specs. Procurement, Measurement- A. Ghosh Arup Ghosh 6 6

OST data 0. 8/0. 778 mm 108/127 strand 210 C/48 h + 400 C/48

OST data 0. 8/0. 778 mm 108/127 strand 210 C/48 h + 400 C/48 h + 665 C/50 h Aug-23, 2012 Conductor Review Oct 16 -17, 2013 LARP Strand : Specs. Procurement, Measurement- A. Ghosh Arup Ghosh 7 7

OST data 0. 8/0. 778 mm 108/127 strand Non-Cu % Aug-23, 2012 Conductor Review

OST data 0. 8/0. 778 mm 108/127 strand Non-Cu % Aug-23, 2012 Conductor Review Oct 16 -17, 2013 LARP Strand : Specs. Procurement, Measurement- A. Ghosh Arup Ghosh 8 8

OST Ti-Ternary Strand Production • • 410 Kg from 12 billets have been delivered

OST Ti-Ternary Strand Production • • 410 Kg from 12 billets have been delivered 6 billets use standard Tin content 6 billets use 5%-Reduced Tin content Reduced Tin has significant impact on the RRR of the copper. • Marginal decrease in Jc. • Lower reaction temperatures needed for Ti-ternary than Taternary wires for equivalent Jc 650°C instead of 665°C • Piece lengths have been very good; some billets drew down in a single piece. Ø For the standard Tin billets, we examined 640°C/48 h to raise the RRR Ø For the Reduced Tin billets, 665°C/48 hr was explored to further optimize Jc Conductor Review Oct 16 -17, 2013 LARP Strand : Specs. Procurement, Measurement- A. Ghosh 9

OST data For Ti-Ternary at 0. 778 mm 210 C/48 h + 400 C/48

OST data For Ti-Ternary at 0. 778 mm 210 C/48 h + 400 C/48 h + 650 C/50 h < Jc >reduced by ~ 3% for the “Reduced-Sn” billets Reduced- Sn Conductor Review Oct 16 -17, 2013 LARP Strand : Specs. Procurement, Measurement- A. Ghosh 10

OST data For Ti-Ternary at 0. 778 mm 210 C/48 h + 400 C/48

OST data For Ti-Ternary at 0. 778 mm 210 C/48 h + 400 C/48 h + 650 C/50 h 5% reduction in Sn content has strong influence on RRR Reduced- Sn Conductor Review Oct 16 -17, 2013 LARP Strand : Specs. Procurement, Measurement- A. Ghosh 11

OST data For Ti-Ternary at 0. 778 mm Reduced- Sn Conductor Review Oct 16

OST data For Ti-Ternary at 0. 778 mm Reduced- Sn Conductor Review Oct 16 -17, 2013 LARP Strand : Specs. Procurement, Measurement- A. Ghosh 12

OST Ti-Ternary Strand Production • • 410 Kg from 12 billets have been delivered

OST Ti-Ternary Strand Production • • 410 Kg from 12 billets have been delivered 6 billets use standard Tin content 6 billets use 5%-Reduced Tin content Reduced Tin has significant impact on the RRR of the copper. • Marginal decrease in Jc. • Lower reaction temperatures needed for Ti-ternary than Taternary wires for equivalent Jc 650°C instead of 665°C • Piece lengths have been very good; some billets drew down in a single piece. Ø For the standard Tin billets, we examined 640°C/48 h to raise the RRR Ø For the Reduced Tin billets, 665°C/48 hr was explored to further optimize Jc Conductor Review Oct 16 -17, 2013 LARP Strand : Specs. Procurement, Measurement- A. Ghosh 13

Conductor Review Oct 16 -17, 2013 mm Reduced-Sn For the normal-Sn content billets we

Conductor Review Oct 16 -17, 2013 mm Reduced-Sn For the normal-Sn content billets we will use 640°C/48 h reaction to raise RRR 0. 85 mm Jc (12 T) and RRR for 0. 778 mm wire LARP Strand : Specs. Procurement, Measurement- A. Ghosh 14

Summary – Lessons Learned • 108/127 strand procurement from three different labs and evolving

Summary – Lessons Learned • 108/127 strand procurement from three different labs and evolving specification from LQ to HQ to QXF has made it hard to adequately oversee the various contracts and its production. 108/127 took a long time to be a stable product. • RRP wire can meet Ic spec with adequate margin • The “reduced-Sn” design change without making any other change in the processing has yielded high dividend in RRR control and should be implemented for all billets going forward. • Increased barrier thickness with “normal-Sn” content is another design change that is being developed for RRR control. I would approach this with caution pending sufficient experience. This design change may help in mitigating sub-element shearing during cabling. • Recommend dedicated RRR check of wire as they are delivered. Substantially lower cost compared to Ic test. Conductor Review Oct 16 -17, 2013 LARP Strand : Specs. Procurement, Measurement- A. Ghosh 15

End of Presentation Conductor Review Oct 16 -17, 2013 LARP Strand : Specs. Procurement,

End of Presentation Conductor Review Oct 16 -17, 2013 LARP Strand : Specs. Procurement, Measurement- A. Ghosh 16