The cryogenic control system of BEPCIIGang Li, Rui Ye, Mingjing Sang, Shaopeng Li, Zhuo Zhang, Jiehao Zhang, Ruixiong Han, Ge Lei and Rui GeEPJ Techn Instrum, 8 1 (2021) 7DOI: https://doi.org/10.1140/epjti/s40485-021-00064-9