Realistic simulation of the 76-inch cyclotron: COMSOL magnetic-field export integrated with an opal particle-tracking model

Accurate studies of particle behavior in accelerator chambers require precise magnetic field maps with regard to the iron geometry. We generated a realistic magnetic-field map for the 76-inch cyclotron at Crocker Nuclear Lab using COMSOL Multiphysics, then imported it into the OPAL (Object-Oriented Parallel Accelerator Library) software to model particle trajectories. It accurately simulates beam dynamics, provides reliable validation against measured data, and establishes a foundation for future cyclotron optimization and upgrades.