Abstract We report here on a performance study and the system design of a 60 K pulse tube cryocooler driven by a linear compressor. The goal of the development was to achieve the design of a fully integrated, cryogen-free HTS RF filter subsystem for wireless telecommunication. Two different single-stage pulse tube cold finger geometries were designed and analyzed—a U-type and a coaxial. The objective was for 3.5 W of cooling capacity at 65 K with a specific power of 30 W/W. Based on quantitative optimization, the U-type cold finger is predicted to provide 3.5 W at 65 K with a P-V input power of 89 W. The corresponding COP and the specific power are about 3.8% and 25W/W, respectively. In contrast, the coaxial cold finger operated at the same conditions is predicted to require 112 W of P-V power for the same cooling capacity. The corresponding COP and the specific power are about 3.1% and 32W/W, respectively. To improve the overall system performance, we also designed and analyzed a two-stage coaxial pulse tube cooler, driven by the same compressor, to provide two separate temperature stages, each optimized for a different element of the load. This cooler provides 0.5W at 65 K at the 2nd-stage while simultaneously providing 3.0 W on the lst-stage cold head at 90K; for this performance the predicted P-V work is 73 W, and the combined COP is 4.8%. The construction of the cooled HTS filter subsystems integrated onto the cold fingers of both the single-stage and two-stage coolers is also described.
Performance and System Design of 60K Pulse Tube Coolers Driven by a Linear Compressor for HTS Filter Subsystems
Cryocoolers 12 ; 123-129
2003-01-01
7 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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