Design of the Super Conducting Super High Momentum Spectrometer (SHMS) for the JLAB 12 GeV Upgrade

The 12 GeV Upgrade at Jefferson Lab requires a new particle spectrometer for precision Nuclear Physics studies at the highest electron momentum available. This new spectrometer the Super High Momentum Spectrometer (SHMS) operating at 11 GeV/c will be built in Hall C to work in coincidence with the present device, the 7.5 GeV/c High Momentum Spectrometer (HMS). The SHMS design requires five new SC magnets arranged as dipole, quad, quad, quad, dipole or dQQQD. The “d” is a small 3.1 T, SC dipole providing an initial 3.5 degree bend which allows the SHMS to reach a 5.5 degree scattering angle and provide enough clearance for the other much larger magnets of the SHMS. The first SC quad is an upgraded version of the HMS Q1 quad running at 10.7 T/m in a 40 cm warm bore with a 1.86 m EFL. The second and third quads are a pair of a completely new design, 60 cm warm bore, 14.4 T/m, 1.6 m EFL ${\rm cosine}2\Theta$ SC quadrupole. Finally, the main dipole is a 60 cm warm bore 4.5 T, 2.85 m EFL magnet that provides the momentum analysis for the SHMS. This project is on schedule for the start of commercial procurement beginning in FY2009 to support start of Physics with the SHMS in 2014. The final design details of these four unique magnets will be presented including the coil design, magnetic design, force collar, and cryostat.