Design of Software for Automatic Correction of Dipole Fringe Field in Heavy Ion Accelerator

The dipole magnet constitutes the fundamental component of the synchrotron. During the acceleration process, the rotation angles of the dipole magnet will undergo a change as the magnetic field rises, which will result in a shift in the tune and an instability in the beam current due to resonance. To address the issue of beam current loss, the Institute of Modern Physics has developed a software solution for automatic tune correction in response to fringe field changes. This software has been integrated into Physics-oriented Accelerator Control System (PACS) and has been deployed in the Space Environment Simulation and Research Infrastructure (SESRI). Following the actual beam test in SESRI, the absolute deviation between the set horizontal tune and the measured horizontal tune after software correction is less than or equal to 0.000 9, and the absolute deviation between the set vertical tune and the measured vertical tune is less than or equal to 0.002.