Abstract We have developed pulse tube cryocoolers for high temperature superconducting (HTS) filter subsystems used in the base stations of mobile telecommunication systems. In July 1999, we reported on our development of a 5 W Stirling pulse tube cryocooler with a contact-type compressor,1 with a cooling capacity of 5.5 W at 80 K for 200 W of input power. However, demands for a smaller-sized cryocooler with higher efficiency and with 5-year reliability prompted us to develop such a cryocooler with a U-type expander and a flexure-bearing-supported linear compressor with opposed pistons. We have developed an HTS filter and a long-life Stirling pulse tube cryocooler to cool the filter whose cooling capacity is around 1W at 80 K, as previously discussed in a progress report.2 For a compressor input power of 60 W at an operating frequency of 52 Hz and a pressure-volume (P-V) work of 26 W, and for a compressor efficiency of 45%, this cryocooler achieved a cooling capacity of 1.05 W at 80 K (0.63 W at 70 K), a specific power of 92 W/W, 5.5% Carnot (3.9% Carnot at 70 K), and a specific P-V work of 40 W/W, with a minimum temperature of 57 K in an ambient of 23°C. The key devices of this filter subsystem are an HTS filter and a low noise amplifier (LNA). The HTS filter is made from a YBCO HTS thin film and has a fractional bandwidth below 1.2% at 2 GHz and has a minimum insertion loss at 0.3dB. The HTS filter and the LNA are operated at a constant temperature of 70 K and the cooling capacity needed by them is 0.6 W. We integrated them with the cryocooler into a subsystem, and the external dimensions of this system are 194 mm high, 180 mm wide, 250 mm deep, with a total volume of 8.7 L.
Development of a Long-Life Stirling Pulse Tube Cryocooler for a Superconducting Filter Subsystem
Cryocoolers 11 ; 119-124
2002-01-01
6 pages
Article/Chapter (Book)
Electronic Resource
English
Development of a Long-Life Stirling Pulse Tube Cryocooler for Superconducting Filter Subsystems
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