SFUMU

The The SFUMU apparatus has recently been converted from its original guise as a dedicated backward muon spectrometer to a dual-orientation device: with its coils transverse to the beam it fulfills its original role, but when turned axial to the beam it is another Omni. This makes it the most omni-purpose of the Omni apparatuses, but with some compromises. The prime motivation for this conversion was the magnet: It delivers 6 A/G allowing experiments at 4.5 kG (0.45 T) on any beamline. The coils can run at 850 A if necessary, so in M15 SFUMU could deliver 0.5 T. The drawback is the small spacing of the coils - only 3 inches - preventing side access for most counters and cryostats, and giving a quite small region of homogeneous field.