Planche, T. Designing Cyclotrons and Fixed Field Accelerators From Their Orbits JACoW Publishing Geneva, Switzerland 978-3-95450-205-9 10.18429/JACoW-Cyclotrons2019-FRB01 English 353-357 FRB01 cyclotron closed-orbit FFAG injection status Contribution to a conference proceedings 2020 2020-06 https://doi.org/10.18429/JACoW-Cyclotrons2019-FRB01 http://jacow.org/cyclotrons2019/papers/frb01.pdf The transverse motion of particles in fixed field accelerators with mid-plane symmetry is entirely determined by the properties of the closed orbits. In this study I exploit this property to produce a variety of isochronous magnetic distributions. All the results presented in this paper are verified using cyclops simulations