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Description
The High Energy Photon Source (HEPS) is the first fourth-generation synchrotron light source in Asia. In HEPS storage ring, there are five 166.6 MHz superconducting cavities serving as fundamental cavities and two 499.8 MHz superconducting cavities as active third harmonic cavities. The employment of active harmonic cavities enables ‘ideal bunch lengthening’ at any beam current, laying a foundation for flexible beam operation.
Beam commissioning of the HEPS storage ring started on July 23, 2024. Due to the presence of delays in the 166.6 MHz cavities, the 499.8 MHz cavities were temporarily utilized as fundamental cavities to provide the required beam acceleration for the first-year commissioning. Starting from August 2025, we initiated the commissioning of an active double-RF system composed of the 166.6 MHz and 499.8 MHz cavities, successfully realizing ideal bunch lengthening under different beam current. Since August 2025, we have commissioned the active double-RF system, successfully achieving ideal bunch lengthening under various beam current conditions.
During the ring commissioning process, some beam phenomena associated with the operation of the double-RF system were observed, and experiences in commissioning active double-RF systems was accumulated. This paper reports the key experiences gained from the commissioning and operation of the active double-RF system in the HEPS storage ring, aiming to provide references for similar accelerator projects.
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