南方先进光源研究测试平台2 K超流氦真空机组控制策略  

Control Strategy for Vacuum Pump of 2 K Superfluid Helium System on Southern Advanced Photon Source Test Platform

作　　者：李娜[1,2] 丁美莹 叶斌[1,2] 蔡毅杰 曹菁[1,2] 杨榆 周冬冬 张玙 何昆 LI Na;DING Meiying;YE Bin;CAI Yijie;CAO Jing;YANG Yu;ZHOU Dongdong;ZHANG Yu;HE Kun(Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;Spallation Neutron Source Science Center,Dongguan 523803,Guangdong,China)

机构地区：[1]中国科学院高能物理研究所,北京100049 [2]散裂中子源科学中心,广东东莞523803

出　　处：《真空与低温》2024年第6期705-711,共7页Vacuum and Cryogenics

摘　　要：南方先进光源研究测试平台低温系统为超导腔提供100 W@2 K的垂直和水平两种测试模式。采用三套机械泵与罗茨泵组成的减压降温真空机组,通过对测试装置抽真空为超导腔提供2 K测试环境。为了保证测试装置内满足2 K@31.3 mbar±0.1 mbar要求,保持一定液位高度,设计了一套对应的减压降温真空机组控制逻辑,通过真空机组入口蝶阀可控开度、罗茨泵变频控制、旁通阀参与调节相互配合,在多轮测试中,能够在2 h内实现4 K到2 K间的转化,极大地减小了测试等待时间,稳定实现了31.3 mbar±0.1 mbar的压力波动,保证了液位的稳定,为超导腔测试提供持续稳定的测试环境,稳定运行时间单次最长720 h。A helium cryogenic system is constructed in Southern Advanced Photon Source test platform,to provide 100 W@2 K vertical and horizontal test modes for the superconducting cavities.The decompression cooling pumps are adopted to achieve 2 K environment by vacuum equipment,which are consist of three mechanical pumps and Roots pumps.To achieve the requirements of 2 K@31.3 mbar±0.1 mbar and retain stable liquid level,a set of control logic is designed for decompression cooling process.Through the cooperation including the controllable opening of the vacuum unit entrance butterfly valve,variable frequency control for the Roots pumps,and the opening of the bypass valve,the conversion process from 4 K to 2 K can be achieved within 2 hours in multiple rounds of test,with the application of this logic,while the waiting time during test can be greatly reduced,and the pressure fluctuation can be controlled within 31.3 mbar±0.1 mbar.The continuous and stable test environment for the superconducting cavity testing is provided,and the stable operation duration is up to 720 hours in one test round.

关 键 词：减压降温 真空机组 2 K超流氦 控制策略 

分 类 号：TB657[一般工业技术—制冷工程] TB753.1