Two-stage pulse tube refrigerator in an entire coaxial configuration

• Published in: Cryogenics (Guildford) Vol. 46; no. 12; pp. 888 - 891
• Main Authors: Koettig, T., Moldenhauer, S., Nawrodt, R., Thürk, M., Seidel, P.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-12-2006
• Subjects: Heat transfer (C); Pulse tube (E); Regenerators (E); Pulse tube (E); Regenerators (E); Heat transfer (C)
• ISSN: 0011-2275; 1879-2235
• DOI: 10.1016/j.cryogenics.2006.08.007

In this paper, we introduce a new kind of two-stage pulse tube refrigerators. The chosen entire coaxial configuration combines the advantages of the coaxial design with the two-stage pulse tube concept. Lead coated screens build the inhomogeneous regenerator matrix of the second stage. Without any rare earth compounds the refrigerator reaches a no load temperature of 6.6
K at the second stage cold tip. The active type of phase shifting is generated by a rotary valve combined with two needle valves at the hot end of each pulse tube (compressor Leybold RW 6000, 6
kW input power). This paper focuses on the design parameters and first performance measurements.