Journal article

Publication year: 1997

Pages: 857-863

Journal: Cryogenics

Volume number: 37

Issue number: 12

ISSN: 0011-2275

DOI Link: https://doi.org/10.1016/S0011-2275(97)00142-2

Publisher: Elsevier

Abstract: 
The first two-stage pulse tube refrigerator, providing a lowest temperature of 2.23 K and a cooling power of 370 mW at 4.2 K, employed a parallel arrangement of the two pulse tubes with phase shifters located at room temperature(1). With the aim of increasing the COP at liquid He-4 temperatures, three modified staging methods were tested in this paper. All refrigerator versions operate with the same two regenerators as already used in the first two-stage setup(1) and also the same 6 kW He-compressor combined with a redesigned G-M rotary valve. The best performance is achieved with a parallel arrangement two-stage refrigerator by introducing proper negative DC flow and impedance tubes. So far the highest cooling power achieved on the second stage at 4.2 K was 0.5 W. With a heat load of 20 W at 67 K on the first stage, the second stage can provide a cooling power of 0.42 W at 4.2 K. Details of the design of the different refrigerators and a comparison of their performance are presented. (C) 1998 Elsevier Science Ltd. All rights reserved.

Harvard Citation style: Wang, C., Thummes, G. and Heiden, C. (1997) Experimental study of staging method for two-stage pulse tube refrigerators for liquid ⁴He temperatures, Cryogenics, 37(12), pp. 857-863. https://doi.org/10.1016/S0011-2275(97)00142-2

APA Citation style: Wang, C., Thummes, G., & Heiden, C. (1997). Experimental study of staging method for two-stage pulse tube refrigerators for liquid ⁴He temperatures. Cryogenics. 37(12), 857-863. https://doi.org/10.1016/S0011-2275(97)00142-2