A 1.8K refrigeration cryostat with 100 hours continuous cooling

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Xu, Dong^1 ; Li, Jian^1,2 ; Huang, Rongjin^1 ; Li, Laifeng^1

Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, China^1

University of Chinese Academy of Sciences, Beijing, China^2

关键词: Continuous cooling;    Cooling process;    Cooling stations;    G-m cryocooler;    Helium vapor;    Joule-Thomson;    Liquid helium;    Working time;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012137/pdf
DOI  :  10.1088/1757-899X/171/1/012137

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

A refrigeration cryostat has been developed to produce continuous cooling to a sample below 1.8 K over 100 hours by using a cryocooler. A two-stage 4K G-M cryocooler is used to liquefy helium gas from evacuated vapor and cylinder helium bottle which can be replaced during the cooling process. The liquid helium transfer into superfluid helium in a Joule-Thomson valve in connection with a 1000 m3/h pumping unit. The pressure of evacuated helium vapor is controlled by air bag and valves. A copper decompression chamber, which is designed as a cooling station to control the superfluid helium, is used to cool the sample attached on it uniformly. The sample connects to the copper chamber in cryostat with screw thread. The cryostat can reach the temperature of 1.7 K without load and the continuous working time is more than 100 hours.