Fringe Fields, Dynamic Aperture and Transverse Depolarisation in the CERN Muon Storage Ring

We evaluate the dynamic aperture for the CERN muon storage ring, and, in particular, study the effect of magnet fringe fields. The detuning with amplitude is computed via normal-form analysis. Particle tracking reveals the dependence of the dynamic aperture on betatron tune and momentum offset, and demonstrates satisfactory performance. The depolarisation in transverse phase space is estimated from a spin normal form. All calculations are performed with the computer codes COSY INFINITY and MAD.