Abstract:
A miniature pulse tube cooler for 80-K cooling has ben developed. In this paper the test results are reported [Kanao et al., Cryogenics ICEC Suppl. 34, 167--170 (1994)]. The cooler is a simple orifice pulse tube type. It is based on a miniature split Stirling cooler. To reduce vibration, the compressor has a dual opposed piston driven by voice coil motors. In the case of 60-W/50-Hz ac input, generated pressure variation is 0.48 MPa peak-to-peak around 2.0 MPa. A regenerator and a pulse tube make up the ``U``-shaped cold finger. In the regenerator 1000 sheets of 400 mesh stainless screen are stacked. The diameter of the screen is 9.3 mm. Dimensions of the pulse tube are 4.4 mm in diameter and 55 mm in length. A reservoir is connected to the hot end of the pulse tube through a long capillary tube without any valves. Its volume is 100 cm[sup 3]. The performances achieved are as follows: The lowest temperature is 69 K, and the cooling power is 400 mW at 80 K with 60 W input and 1 W at 80 K with 160 W input.