Beam Poiarization Effects in High Energy Electron-positron Storage Rings

Calculations are presented of beam polarization-dependent effects in high energy e+estorage rings. The elastic scattering within a circulating bunch (Touschek scattering) leads to a net polarization-dependent effect of 5 to 10% for parameters appropriate to SPEAR, viz, E = 2.5 Gev, LIE/E = 0.05, 0 0 and 6pL = 0.6 Mev, where E. is the storage ring energy, AE is the average energy exchanged in the collisions and 6pl is the width of the radial momentum distribution in the bunch. The final state angular distributions of the scattering proc g ' 4 e+e-, e+e-) u'+cland e+e+ YY are considerably sses e e modified by beam polarization, even for relatively low values of the timeaveraged polarization. Calculations of counting rates and polarization-dependent effects for these e+ecollision processes are given.