Fixed-Tune Non-Scaling FFAs

Recent studies by Dejan Trbojevic have confirmed that non-scaling FFAs can have their tune dependence on momentum flattened by adding non-linear components to the magnet fields, although not necessarily for an unlimited momentum range.  This talk presents investigations of such cells suitable for the RAL 3-12MeV FETS-FFA proposal and also an analytic derivation of the field shape based on a simplified cell.