Current ideas for designing neutrino factories and muon colliders require unique configurations of fields and materials to prepare the muon beam for acceleration [1,2]. We have continued the development of the 3-D tracking code ICOOL for examining possible system configurations [3]. Development of the ICOOL code began in 1996 in order to simulate the process of ionization cooling. This required tracking in magnetic focusing lattices, together with interactions in shaped materials that must be placed in the beam path. Eventually the early linear cooling channels evolved into cooling rings. In addition the facilities require many other novel beam manipulations besides ionization cooling, such as pion collection in a high field solenoid, rf phase rotation, and acceleration in FFAG rings. We describe some of the new features that have been incorporated in ICOOL for handling these requirements. A suite of auxiliary codes have also been developed for pre-processing, post-processing, and optimization.
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