Abstract Performance of pulse tube cryocoolers working around 4 K region is affected by the fact that helium gas deviates from the ideal gaseous state. Previous experimental studies are mostly done in the working pressure region of 1 to 2 MPa, similar to the commercially available 4 K GM coolers. However, the non-ideal state of the helium gas near 4 K region suggests that use of lower working gas pressure should give a better performance. In order to verify this hypothesis, an experimental apparatus consisting of a single stage pulse tube cryocooler was fabricated and tested at different base pressures down to 1 atmosphere. A two-staged G-M cooler was used as the pre-cooler to keep the pre-cooling temperature constant Experimental results show that a significant increase of cooling performance can be obtained near the plateau temperature region on T-S diagram by decreasing the mean working gas pressure as anticipated.


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    Title :

    Performance Dependence of 4K Pulse Tube Cryocooler on Working Pressure


    Contributors:
    Yoshimura, N. (author) / Zhou, S. L. (author) / Matsubara, Y. (author) / Chandratilleke, G. R. (author) / Ohtani, Y. (author) / Nakagome, H. (author) / Okuda, H. (author) / Shinohara, S. (author)

    Published in:

    Publication date :

    2002-01-01


    Size :

    6 pages




    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English




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