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Description
The High Energy Photon Source (HEPS) is a commissioned 6 GeV fourth-generation synchrotron source in China, now in the pre-operation stage. To achieve an ultra-low emittance of 35pm, the HEPS storage ring employs swap-out injection, significantly reducing the dynamic aperture requirements. However, to satisfy time-resolved experiments, the injector need to prepare full-charge bunches of exceeding 15 nC, imposing stringent requirements on beam generation and acceleration.
To this end, the HEPS team designed a swap-out injection scheme with beam recycling, utilizing the booster as a high-energy accumulation ring for recycling extracted bunches from the storage ring. This approach alleviates bottlenecks in generating, capturing, and accelerating high-charge bunches at the low-energy end of the injector. Beam synchronization and transmission efficiency are two main challenges of this scheme.
The commissioning of the HEPS storage ring commenced in July 2024, through phased commissioning and optimization, this novel injection scheme was successfully demonstrated on January 2, 2025 and used in routine operation since then. Now a single bunch charge of over 7nC in the storage ring has been achieved with this scheme, with further improvements under way.
This contribution summarizes the beam commissioning and operation experiences of this novel injection scheme, offering relevant insights for designs of future synchrotron radiation facilities and circular colliders.
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