Two-stage high frequency pulse tube cooler for refrigeration at 25 K

Details Two-stage high frequency pulse tube cooler for refrigeration at 25 K Two-stage high frequency pulse tube cooler for refrigeration at 25 K

2009-10-08

arxiv.org/abs/0910.1522v2

Cryogenics 50 (2010) 281-286

Physics

Instrumentation and Detectors

Scientific paper

10.1016/j.cryogenics.2010.01.010

A two-stage Stirling-type U-shape pulse tube cryocooler driven by a 10 kW-class linear compressor was designed, built and tested. A special feature of the cold head is the absence of a heat exchanger at the cold end of the first stage, since the intended application requires no cooling power at this intermediate temperature. Simulations where done using Sage-software to find optimum operating conditions and cold head geometry. Flow-impedance matching was required to connect the compressor designed for 60 Hz operation to the 40 Hz cold head. A cooling power of 12.9 W at 25 K with an electrical input power of 4.6 kW has been achieved up to now. The lowest temperature reached is 13.7 K.

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