The High Energy Photon Source (HEPS) is a 35-pm, 1360-m storage ring light source being built in the suburb of Beijing, China. The HEPS construction started in 2019, with the main civil construction finished at the end of 2021. In the past two years, the beam commissioning of the HEPS storage ring had been started and bascially finished. In this paper, we will briefly introduce commissioning of the HEPS storage ring, and relavent physics studies.

The High Energy Photon Source (HEPS) adopts on-axis swap-out injection to relax the dynamic-aperture requirement of its ultralow-emittance storage ring. To provide high-charge bunches for swap-out operation, a booster-based beam-recycling scheme has been developed, in which a depleted storage-ring bunch is extracted, transported to the booster, combined with a newly accelerated bunch at high energy, damped, and reinjected into the original storagering bucket. This paper summarizes the commissioning status of this scheme. Closed-loop beam recycling has been demonstrated, paving the way for user operation toward high bunch charge. The results validate the basic beam-recycling architecture and identify the main directions for further optimization toward routine high-charge operation.