✦ LIBER ✦

Experimental investigation of 4 K pulse tube refrigerator

✍ Scribed by J.L Gao; Y Matsubara

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 534 KB
Volume: 34
Category: Article
ISSN: 0011-2275
DOI: 10.1016/0011-2275(94)90048-5

No coin nor oath required. For personal study only.

✦ Synopsis

To investigate how to reach 4 K using a pulse tube and the best multiple staging configuration for the pulse tube, experiments were performed on several types of singlestage pulse tube refrigerators coupled with a Gifford-McMahon cryocooler. The minimum temperature obtained at the cold end of the pulse tube using this unit was 3.5 K, when the hot end of the pulse tube was located at room temperature. The hot end of the final stage regenerator was precooled at ~ 15-20 K. The optimum operating conditions involved a mean pressure of ~ 1.0-1.5 MPa and a frequency of ~ 1-2 Hz. Heat flow and loss analysis, as related to the phase shift effect, as well as the arrangement of the multi-stage pulse tube refrigerator for reaching 4 K, are briefly discussed.

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