Speaker
Description
High Intensity Heavy-ion Accelerator Facility (HIAF) is a mega accelerator cluster under construction in China. It’s designed to provide high intensity primary and secondary heavy ion beams. To achieve the challenging intensity goal under space charge effect and dynamic vacuum effect, an injection accumulation factor of 56 and an uncontrolled beam loss must remain below 5% is demanded. A dual-plane painting injection scheme has therefore been developed to achieve the required high accumulation factor and low beam loss, instead of conventional horizontal-plane painting. The space charge effect and dynamic vacuum effect are the primary limitations of beam intensity. Especially, mitigating the beam loss in the injection electrostatic septum is a critical approach to achieve a higher beam intensity. Therefore, a novel ES collimator is proposed to reduce beam deposition on the septum. Dynamic simulation of the dual-plane painting injection of BRing reveals the excellent performance of this scheme by a tenfold reduction in beam loss. HIAF generated the first beam on 28 Oct. 2025. Then it achieved the excellent intense pluses of $^{18}$O and $^{209}$Bi ions in the following performance test. The commissioning and study of injection system will be reported.