HL-LHC/LARP Cable Review, CERN, Nov Lessons Learnt in LARP- A. Ghosh 1 Lessons Learnt from LARP experience Arup. K. Ghosh HL-LHC/LARP International review of the Superconducting Cable for the HL-LHC Inner Triplet Quadrupole (MQXF) CERN Nov 05-06, 2014

HL-LHC/LARP Cable Review, CERN, Nov Lessons Learnt in LARP- A. Ghosh 2 Outline Introduction Production History of 108/127 strand Performance of 108/127 Ta-Ternary Ti-Ternary Ti-Ternary HQ-strand : Sn-content design change for RRR control Summary - Lessons Learned Strand Production Cable production

HL-LHC/LARP Cable Review, CERN, Nov Lessons Learnt in LARP- A. Ghosh 3 OST data For Ti-Ternary at mm Reduced- Sn 210C/48h + 400C/48h + 650C/50h reduced by ~ 3% for the “Reduced-Sn” billets

HL-LHC/LARP Cable Review, CERN, Nov Lessons Learnt in LARP- A. Ghosh 4 OST data For Ti-Ternary at mm 210C/48h + 400C/48h + 650C/50h Reduced- Sn 5% reduction in Sn content has strong influence on RRR

HL-LHC/LARP Cable Review, CERN, Nov Lessons Learnt in LARP- A. Ghosh 5 OST data For Ti-Ternary at mm Reduced- Sn

HL-LHC/LARP Cable Review, CERN, Nov Lessons Learnt in LARP- A. Ghosh 6 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 several years to be a stable product. So far OST production for LARP strand has been a mix of optimization of strand design, wire production that is not strictly a production, and has been a learning experience for OST. Going forward we need to apply production QA controls at OST and more oversight with vendor site visits on a regular basis. This might also require performing process audits at the vendor. Identifying a QA manager at OST that will be responsible for our product.

HL-LHC/LARP Cable Review, CERN, Nov Lessons Learnt in LARP- A. Ghosh 7 Summary – Lessons Learned 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. As shown earlier the 132/169 strand needs to have more manufacturing margin to meet Ic specification. In this regard, OST is further optimizing the Sn content to increase Ic and still meeting the RRR specification. Cable _lessons learned (input from Dan)

HL-LHC/LARP Cable Review, CERN, Nov Lessons Learnt in LARP- A. Ghosh 8 End of Presentation