Heat Treatment Optimization of Rutherford Cables for a 15 T Nb₃Sn Dipole Demonstrator

Journal Article · Mon Jan 09 00:00:00 EST 2017 · IEEE Transactions on Applied Superconductivity

DOI:https://doi.org/10.1109/TASC.2016.2645180· OSTI ID:1339108

Barzi, Emanuela  ^[1]; Bossert, Marianne ^[1]; Field, Michael ^[2]; Li, Pei ^[1]; Miao, Hanping ^[2]; Parrell, Jeff ^[2]; Turrioni, Daniele ^[1]; Zlobin, Alexander ^[1]

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1. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
2. Oxford Instruments, Carteret, NJ (United States). Superconducting Technology

FNAL has been developing a 15 T Nb₃Sn dipole demonstrator for a future Very High Energy pp Collider based on an optimized 60-mm aperture 4-layer “cos-theta” coil. In order to increase magnet efficiency, we graded the coil by using two cables with same 15 mm width and different thicknesses made of two different Restacked Rod Process (RRP®) wires. Due to the non-uniform field distribution in dipole coils the maximum field in the inner coil will reach 15-16 T, whereas the maximum field in the outer coil is 12-13 T. In preparation for the 15 T dipole coil reaction, heat treatment studies were performed on strands extracted from these cables with the goal of achieving the best coil performance in the corresponding magnetic fields. Particularly, the effect of maximum temperature and time on the cable critical current was studied to take into account actual variations of these parameters during coil reaction. In parallel and in collaboration with OST, development was performed on optimizing Nb₃Sn RRP® wire design and layout. Index Terms— Accelerator magnet, critical current density, Nb₃Sn strand, Rutherford cable.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: HighFled Magnets
• Grant/Contract Number: AC02-07CH11359
• OSTI ID: 1339108
• Report Number(s): FERMILAB-CONF-16-607-TD; 1508570; TRN: US1701017
• Journal Information: IEEE Transactions on Applied Superconductivity, Vol. PP, Issue 99; Conference: Applied Superconductivity Conference, Denver, CO (United States), 4-9 Sept 2016; ISSN 1051-8223
• Publisher: Institute of Electrical and Electronics Engineers (IEEE)
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
accelerator magnet
critical current density
Nb3Sn strand
Rutherford cable