Utilization strategies of beam dumps for High energy FRagment Separator (HFRS) at HIAF

Abstract The construction of the High Intensity heavy-ion Accelerator Facility (HIAF) is currently underway, with the High Energy FRagment Separator (HFRS) serving as a critical component. The HFRS, a next-generation in-flight radioactive separator, is designed to produce, separate, and purify rare isotopes with a maximum magnetic rigidity of 25 Tm, facilitating experimental studies on very short-lived and neutron-rich isotopes. To protect the environment and equipment, beam dumps are essential for intercepting high-intensity primary beams with different charge states post-target. Utilizing the beam optics of the HFRS and beam parameters after the target, Geant4 ion tracking simulations were employed to determine the ion trajectories of both primary beam and secondary beam. The interception efficiency for the primary beam and the transmission efficiency for the secondary beam were calculated, providing strategies and movement range for beam dump utilization. These findings are expected to contribute to the future operation of the HFRS.