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Description
The Dalian Advanced Light Source (DALS) test facility has developed a vertical test cryostat to measure the quality factor and accelerating gradient of SRF cavities at a nominal temperature of 2 K. The cryostat employs a dedicated insert that can accommodate four cavities simultaneously. A built-in phase separator of the cryostat aims to pre-cool the supply helium and further facilitates the conversion of liquid helium into He Ⅱ. Commissioning and first cool down of the vertical test cryostat were finished in November 2024. The maximum helium flow rate of 57 g/s at 4.5 K was provided when the cavities cooled through Tc. The static heat load measurement of the cryostat was conducted, which agrees qualitatively well with the simulation results. This paper presents the flow scheme, design, cold commissioning and heat load performance of the vertical test cryostat.
