Abstract

China Spallation Neutron Source (CSNS) cryogenic system provides supercritical cryogenic hydrogen for two moderators of the target station. The commissioning work of the cryogenic system is mainly divided into four steps:(1) the acceptance test of the helium refrigerator, using the refrigerator internal heater as thermal load, and verify whether the helium refrigerator refrigerating capacity meet the requirements of the contract or not; (2) Helium commissioning, using dummy load to simulate the dynamic heat load of the moderator, and system cool down to 20K with He instead of H2. (3) Hydrogen commissioning based on the step 2, while system is cooled down to 20K with hydrogen as working medium. (4) Joint Commissioning with two moderators. So far, the CSNS cryogenic system has completed all commissioning work and finished four rounds of stable operation for the commissioning of the target station and spectrometer.

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