Cost of High Field Nb sub 3 Sn and Nb-Ti Accelerator Dipole Magnets

摘要

Future high-energy proton accelerators will likely require very high magnetic fields if the size of the accelerator and associated experimental areas are to be limited to dimensions that can be accommodated by the terrain at convenient sites. For example, the circumference of a 20 TeV, 10 T accelerator will be about 60 km. Two commercially available superconductors can be used to produce fields of 10 T or greater. The first is Nb sub 3 Sn, which can operate in pool boiling helium at 4.4 K, the second is Nb-Ti, which must be cooled to about 1.9 K in superfluid helium. In this paper the costs of 7 to 11 T, 5 cm bore, 6 m long magnets made of these materials are compared. At 10 T the capital cost of Nb-Ti coils operating in superfluid helium is 35% less than the cost of Nb sub 3 Sn coils and the cost is still 10% less after the differential operating costs over the life of the accelerator are included. 10 references, 11 figures, 16 tables. (ERA citation 08:051975)