Performance improvement of multi-stage pulse tube cryocoolers with a self-precooled pulse tube

► A self-precooled pulse tube applied to multi-stage pulse tube cryocooler is studied. ► It is used to decrease the pulse tube heat losses. ► The pulse tube of the low temperature stage is precooled by the cryocooler itself. ► Both simulation analysis and experiment verification are carried out. ► This method is proved to be beneficial and feasible.