Roadmap for Future Accelerators, I.FAST WP5 members

Summarizing 3.5 years of I.FAST activities and taking into account the worldwide state of the art in various domains of accelerator science, we present an R&D plan and step-wise approach towards ultimate hadron and lepton beams. Aside more mainstream topics, we review advances in photon science, nuclear science, neutron science, high-field magnet technology, and medical applications; sketch a strategy for intense positron sources; discuss past lessons and possible directions for crystalline beams; review the strategy and requirements for “beam chaser” colliders and EDM rings; discuss the roadmap for accelerator AI, and for accelerator-based quantum computing; and we survey the actual situation and future roadmap for green accelerators and for safe CO2-free energy production. Among the highlights are new radiation schemes, novel neutron sources, and nano-accelerators.