Heat Treatment Optimization of Rutherford Cables for a 15 T Nb3Sn Dipole Demonstrator
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- 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)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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