Dimensional changes of Nb₃Sn Rutherford cables during heat treatment

Journal Article · 31 May 2016 · IEEE Transactions on Applied Superconductivity

DOI: https://doi.org/10.1109/TASC.2016.2539156 · OSTI ID:1326592

Rochepault, E. ^[1]; Ferracin, P. ^[1]; Ambrosio, G. ^[2]; Anerella, M. ^[3]; Ballarino, A. ^[1]; Bonasia, A. ^[1]; Bordini, B. ^[1]; Cheng, D. ^[4]; Dietderich, D. R. ^[4]; Felice, H. ^[4]; Fajardo, L. Garcia ^[1]; Ghosh, A. ^[3]; Holik, E. F. ^[2]; Bermudez, S. Izquierdo ^[1]; Perez, J. C. ^[1]; Pong, I. ^[4]; Schmalzle, J. ^[3]; Yu, M. ^[2]

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1. European Organization for Nuclear Research (CERN), Geneva (Switzerland)
2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
3. Brookhaven National Lab. (BNL), Upton, NY (United States)
4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

In high field magnet applications, Nb₃Sn coils undergo a heat treatment step after winding. During this stage, coils radially expand and longitudinally contract due to the Nb₃Sn phase change. In order to prevent residual strain from altering superconducting performances, the tooling must provide the adequate space for these dimensional changes. The aim of this paper is to understand the behavior of cable dimensions during heat treatment and to provide estimates of the space to be accommodated in the tooling for coil expansion and contraction. In addition, this paper summarizes measurements of dimensional changes on strands, single Rutherford cables, cable stacks, and coils performed between 2013 and 2015. These samples and coils have been performed within a collaboration between CERN and the U.S. LHC Accelerator Research Program to develop Nb₃Sn quadrupole magnets for the HiLumi LHC. The results are also compared with other high field magnet projects.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1326592
• Alternate ID(s): OSTI ID: 1336106; OSTI ID: 1454465
• Report Number(s): FERMILAB-PUB--16-055-TD; 1466573
• Journal Information: IEEE Transactions on Applied Superconductivity, Journal Name: IEEE Transactions on Applied Superconductivity Journal Issue: 4 Vol. 26; ISSN 1051-8223
• Publisher: Institute of Electrical and Electronics Engineers (IEEE)Copyright Statement
• Country of Publication: United States
• Language: English