A novel coupled VM-PT cryocooler operating at liquid helium temperature |
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| Affiliation: | 1. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, CAS, Beijing 100190, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China;2. Institute of Applied Physics, University of Giessen, D-35392 Giessen, Germany;3. TransMIT-Centre for Adaptive Cryotechnology and Sensors, D-35392 Giessen, Germany;1. Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, China;2. College of Mechanic Engineering, University of Wisconsin, Madison 53706, USA;3. School of Mechanical and Engineering, Southeast University, Nanjing 21000, China;1. Korea Advanced Institute of Science and Technology Daejeon, 34141, Republic of Korea;1. Department of Engineering, University of Cambridge, Cambridge CB2 1PZ, United Kingdom;2. CAS Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;4. Department of Chemical Engineering, Imperial College London, London SW7 2BU, United Kingdom |
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| Abstract: | This paper presents experimental results on a novel two-stage gas-coupled VM-PT cryocooler, which is a one-stage VM cooler coupled a pulse tube cooler. In order to reach temperatures below the critical point of helium-4, a one-stage coaxial pulse tube cryocooler was gas-coupled on the cold end of the former VM cryocooler. The low temperature inertance tube and room temperature gas reservoir were used as phase shifters. The influence of room temperature double-inlet was first investigated, and the results showed that it added excessive heat loss. Then the inertance tube, regenerator and the length of the pulse tube were researched experimentally. Especially, the DC flow, whose function is similar to the double-orifice, was experimentally studied, and shown to contribute about 0.2 K for the no-load temperature. The minimum no-load temperature of 4.4 K was obtained with a pressure ratio near 1.5, working frequency of 2.2 Hz, and average pressure of 1.73 MPa. |
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| Keywords: | VM cryocooler Pulse tube Liquid helium temperature Inertance tube |
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