Development of Low Frequency Pulse Tube Refrigerators

Gifford-McMahon (G.M.) like pulse tube (P.T.) refrigerators are under development at CEA/SBT. The pressure oscillation in the P.T. is generated by a commercial helium compressor associated with a rotating distribution valve. The P.T. are operated at low frequency (1–2 Hz) and their performance and potential applications are close to those of conventional G.M. cryorefrigerators.