An Inter-phasing Stirling Pulse-tube Cryocooler without Reservoirs

Asubstantial fraction of the volume of a traditional pulse-tube cryocooler is occupied by a reservoir, which greatly reduces the specificpower of the cryocooler. This is undesirable for applications that require a small size and light weight.This paper presents aninter-phasing pulse-tube cryocooler conjoining two or more cold fingers via their inertance tubes. Because the volume flow in the cold fingers are elaborately adjusted to make the total volume flow into the junction of the inertance tubes zero, the reservoirs are allowed to be removed. Experimentsdemonstrated that, with an electric input power of 1 kW, the cooling power at 77 K reached 59.8 W, corresponding to a relative Carnot efficiency of 16.8%. Compared with a traditional pulse-tube cryocooler, this cryocooler canachieve the same cooling performance.