Speaker
Description
An 18MeV/1mA high-current cyclotron has been designed and constructed at the China Institute of Atomic Energy (CIAE). In this cyclotron, H⁻ ions are accelerated and extracted via carbon stripping foils. To analyze beam loss in this high-current machine, beam dynamics simulations were performed based on measured magnetic field data. The simulations account for beam oscillations, phase slippage, and axial motion of non-ideal beams to determine beam alignment conditions and the influence of Walkinshaw resonance. We computed beam behavior during acceleration and extraction under various alignment conditions, with particular attention to the beam’s particle-optical properties after stripping extraction—including energy spread, envelope variations, and beam loss. The results demonstrate that well-aligned beams exhibit significantly reduced beam loss compared to misaligned beams.
