HWR type superconducting niobium cavity
After more than 8 months of hard work, the researchers of the Institute of Modern Physics of the Chinese Academy of Sciences completed the processing of the half-wavelength resonance (HWR) superconducting niobium cavity of the ADS superconducting linear accelerator injector II, and carried out the normal temperature Vacuum and frequency tests indicate that important progress has been made in the development of the cavity.
The development of HWR superconducting niobium cavity completed the process design, stamping forming, processing orthopedics, frequency pre-tuning, parts pickling, electron beam welding and other processes, and completed the processing in the State Key Laboratory of Advanced Welding and Connection of Harbin Institute of Technology Near-instance institute conducted room temperature high frequency test and vacuum leak detection.
The operating frequency of the HWR superconducting niobium cavity is 162.5MHz, the design frequency at normal temperature is 162.5023MHz, and Q0 is 2942. Taking into account the influence of subsequent surface treatment, vacuuming, cooling and other factors on the frequency of the superconducting cavity, the resonant frequency of the cavity after processing should be slightly higher than 162.5MHz. The frequency test values ​​of the two HWR superconducting niobium chambers at room temperature are 162.7260 MHz and 162.7187 MHz, and the Q0 test values ​​are 2650 and 2687, respectively. The test results of the two parameters are consistent with the simulation calculation results. The leakage rate of the superconducting cavity is less than 1 × 10-10mbar.l / s, which meets the requirements of engineering design.
HWR superconducting cavity is the acceleration cavity type adopted by ADS pilot special superconducting linear accelerator injector II. The processing technology and process of this type of superconducting cavity has no precedent in China. The successful manufacture of the HWR superconducting cavity solves the difficulties in the key processes and technical routes such as stamping, orthopedics, pre-tuning, component pickling, and electron beam welding during the development process, forming a set of process specifications.
The HWR superconducting cavity was assisted and supported by peer experts from the Institute of Heavy Ion Research and the Institute of High Energy Physics of Peking University in the process of development and processing.
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