Speaker
Description
This paper summarizes recent progress in cyclotron research and development at Lanzhou University. In computational physics, a comprehensive time-domain beam dynamics code, RAYS, has been developed that solves the Newton-Lorentz equation using 4th or 5th order Runge-Kutta integrators to simulate particles from injection to extraction. RAYS supports synchrocyclotron modeling with a time-varying RF frequency module and facilitates automated design workflows via both GUI and console modes. Additionally, a high-stability closed-orbit analysis program RSCYC has been created. It employs a multi-scale coarse scanning method combined with the Adam optimization algorithm and symmetry constraints to ensure rapid, stable convergence to physical solutions. The numerical accuracy of these codes has been validated through cross-verification with mainstream programs.
Leveraging these in-house dynamics programs, several cyclotron projects are under development. For hadron therapy, the 230 MeV superconducting isochronous cyclotron (SC230) has entered the full production phase, with some systems already mechanically fabricated. Meanwhile, the comprehensive physics design and dynamics analysis for the 210 MeV superconducting synchrocyclotron (S2C210) have been completed. For isotope production, the 8 MeV proton cyclotron (Smart8) is also in full production, while the physics design for the 30 MeV alpha cyclotron (Smart30α) has been finalized.
