High-power Fixed-Field Accelerators

Abstract We report the state of field High-Power Fixed-Field Accelerators (with an emphasis on cyclotrons) as discussed by international experts during a three-day workshop same name in 2021. The was part Snowmass'21 Community Planning Exercise. Here, we take stock world inventory high-power fixed-field accelerators, assess available beam currents and powers, investigate limitations. Furthermore, evaluate role these machines particle physics, directly used or injectors to other machines, industry, drivers for (medical) isotope production and, potentially, accelerator-driven systems sub-critical reactors. Finally, discuss novel concepts cutting-edge developments push current higher at several energy scales, thereby increasing relative power. Highlights include new spiral inflector types, direct RFQ injection, H 2 + acceleration, utilizing vortex motion, self-extraction schemes. also modern computational frameworks optimize accelerators more efficiently, better describe relevant physical processes simulations.