Journal article

Publication year: 1998

Pages: 337-342

Journal: Cryogenics

Volume number: 38

Issue number: 3

ISSN: 0011-2275

DOI Link: https://doi.org/10.1016/S0011-2275(97)00169-0

Publisher: Elsevier

Abstract: 
On the basis of previous results obtained with a two-stage pulse tube cooler that was able to provide a net cooling power of up to 0.37 W at 4.2 K, a somewhat modified version has been built to use it for small scale He-4 liquefaction. This paper presents first results obtained with this liquefier, which was operated with a GM-rotary valve and a GM-type compressor of 6 kW input power. After the initial cool down period of about two hours for the second stage, a steady liquefaction rate of 0.13 I/h at 4.2 K was obtained for He-4 gas entering the cooler under normal pressure at room temperature. The liquid was collected in a vacuum insulated pot surrounded by a radiation shield attached to the first stage. No precooling of the 4He gas other than by the first and second stage was used. (C) 1998 Elsevier Science Ltd. All rights reserved.

Harvard Citation style: Thummes, G., Wang, C. and Heiden, C. (1998) Small scale ⁴He liquefaction using a two-stage 4 K pulse tube cooler, Cryogenics, 38(3), pp. 337-342. https://doi.org/10.1016/S0011-2275(97)00169-0

APA Citation style: Thummes, G., Wang, C., & Heiden, C. (1998). Small scale ⁴He liquefaction using a two-stage 4 K pulse tube cooler. Cryogenics. 38(3), 337-342. https://doi.org/10.1016/S0011-2275(97)00169-0