In order to get the cooling temperature to the liquid hydrogen temperature and guarantee the temperature stability at the same time

experimental investigation on single-stage high frequency multi-bypass pulse tube cryocooler (PTC) without double-inlet is carried out. A criterion that determines whether the opening of the multi-bypass is optimum or not

is achieved by numerical simulation firstly. At present

the cooler has reached the lowest temperature of 23.6K with an electric input power of 220W

which is the reported lowest temperature for single-stage high frequency PTC without double-inlet. The fluctuations are below 0.1K after reaching its stable state

which is much smaller than that of other double-inlet PTCs. The cooler typically provides 0.516W at 29.2K and 1.0W at 34.1K with the input power of 220W.