Design study of a large-gap superconducting spectrometer dipole

The conceptual design of the large gap Spectrometer Dipole for the LHC-b ex periment is presented here. The required acceptance implies a gap height of 3.6 m and a width of 4.3 m. Although the magnetic induction of the 1.92 m long magnet is only 1.1 T, it turns out that a superconducting (SC) coil is the most economic solution. The design considerations for the yoke and the SC-coil are explained, the parameters of the conductor, coil, cooling syst em are presented and the quench behavior is estimated.