Lagrange, J.-B. Kelliher, D.J. Machida, S. Prior, C.R. Rogers, C.T. JACoW Publishing Geneva, Switzerland 978-3-95450-205-9 10.18429/JACoW-Cyclotrons2019-WEB01 English 266-269 WEB01 cyclotron lattice synchrotron focusing proton Contribution to a conference proceedings 2020 2020-06 https://doi.org/10.18429/JACoW-Cyclotrons2019-WEB01 http://jacow.org/cyclotrons2019/papers/web01.pdf Since their rebirth two decades ago, great progress has been made in Fixed Field alternating gradient Accelerator (FFA) design, with different optical concepts and technological developments. Several machines have been built, and others are planned. The talk will review the recent progress around the world.