Two-stage high frequency pulse tube refrigerator with base temperature below 10 K

Cryogenic Engineering Conference 2017

材料科学;物理学

Chen, Liubiao^1,2 ; Wu, Xianlin^1,2 ; Liu, Sixue^1,2 ; Zhu, Xiaoshuang^1,2 ; Pan, Changzhao^1 ; Guo, Jia^1,2 ; Zhou, Yuan^1,2 ; Wang, Junjie^1,2

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

100190, China^1

University of Chinese Academy of Sciences, Beijing

100049, China^2

关键词: Base temperature;    Coaxial configuration;    High-frequency pulse;    Linear compressors;    Pulse tube refrigerators;    Regenerative materials;    Stainless steel mesh;    Working frequency;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012147/pdf
DOI  :  10.1088/1757-899X/278/1/012147

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This paper introduces our recent experimental results of pulse tube refrigerator driven by linear compressor. The working frequency is 23-30 Hz, which is much higher than the G-M type cooler (the developed cryocooler will be called high frequency pulse tube refrigerator in this paper). To achieve a temperature below 10 K, two types of two-stage configuration, gas coupled and thermal coupled, have been designed, built and tested. At present, both types can achieve a no-load temperature below 10 K by using only one compressor. As to gas-coupled HPTR, the second stage can achieve a cooling power of 16 mW/10K when the first stage applied a 400 mW heat load at 60 K with a total input power of 400 W. As to thermal-coupled HPTR, the designed cooling power of the first stage is 10W/80K, and then the temperature of the second stage can get a temperature below 10 K with a total input power of 300 W. In the current preliminary experiment, liquid nitrogen is used to replace the first coaxial configuration as the precooling stage, and a no-load temperature 9.6 K can be achieved with a stainless steel mesh regenerator. Using Er3Ni sphere with a diameter about 50-60 micron, the simulation results show it is possible to achieve a temperature below 8 K. The configuration, the phase shifters and the regenerative materials of the developed two types of two-stage high frequency pulse tube refrigerator will be discussed, and some typical experimental results and considerations for achieving a better performance will also be presented in this paper.