Speaker
Description
A high-Q, high-gradient 1.3 GHz cryomodule containing eight 9-cell SRF cavities has been designed, manufactured, and assembled at IHEP-CAS. The eight cavities achieve an average unloaded quality factor (Q₀) of 3.8×1010 at 16 MV/m and 3.6×1010 at 18 MV/m. After horizontal testing, the cryomodule was transported approximately 1,000 km to Dalian.
To achieve such exceptional performance, the beamline vacuum system must be kept extremely clean. However, an ultra-high vacuum is not required at room temperature, as long as the high-frequency aging process is adequately performed. Therefore, cleanliness must be maintained throughout the entire process, including component cleaning, assembly, rough pumping, nitrogen purging, and transport.
In addition, vacuum pressure fluctuations were continuously monitored during cavity cooldown, operation, warmup and coupler aging to prevent vacuum degradation. Furthermore, during the long-distance transport of the cryomodule, the beamline vacuum pressure was recorded continuously to confirm the absence of any leaks.
Funding Agency
YIPA-CAS, Grant 2023017
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