Development of Commissioning and operation of CSNS Cryogenic System

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

Chongchao, He^1^2 ; Bin, Ye^1^2 ; Na, Li^1^2 ; Meiying, Ding^1^2 ; Yaqiong, Wang^1^2 ; Yu, Zhang^1^2 ; Kun, He^1^2

China Spallation Neutron Source (CSNS), Institute of High Energy Physics (IHEP), Chinese Academy of Sciences (CAS), Dongguan

523803, China^1

Dongguan Institute of Neutron Science (DINS), Dongguan

523808, China^2

关键词: China spallation neutron source (CSNS);    Cryogenic system;    Dynamic heat;    Helium refrigerators;    Refrigerating capacity;    Stable operation;    Supercritical;    Working medium;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012017/pdf
DOI  :  10.1088/1757-899X/502/1/012017

来源: IOP

【 摘 要 】

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.