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A model of the Alternating Gradient Synchrotron, based on th e AGS snapramps, has been developed in the stepwise ray-trac ing code Zgoubi. It has been used over the past 5 years in a number of acc elerator studies aimed at enhancing RHIC proton beam polari zation. It is also used to study and optimize proton and Helion beam pola rization in view of future RHIC and eRHIC programs. The AGS mo del in Zgoubi is operational on-line via three different applicat ons, ’ZgoubiFromSnaprampCmd’, ’AgsZgoubiModel’ and ’Ag sModelViewer’, with the latter two essentially interfaces to the former which is the actual model ’engine’. All three commands are available from the controls system application launcher in the AGS ’StartUp’ menu, or fr m eponymous commands on shell terminals. Main aspects of th e model and of its operation are presented in this technical note, brief excerpts from various studies performed so far are given for illustration, means and methods entering in ZgoubiFromSnaprampCmd are developed f urther in appendix. Tech. Note C-A/AP/566 BNL C-AD

A model of polarized-beam AGS in the ray-tracing code Zgoubi