Abstract
As a point to do special mention in cryocooler development of late years, it is splendid of late years surpasses Stirling cryocooler. We developed the small size of efficiency Stirling type pulse tube cryocooler that cooling uses such as high-temperature superconductor and semiconductor sensor was turned into with a purpose. As demand specification from the device side to the cryocooler side, smaller light weight, the high efficiency, high reliability is sought for. For those demand specification, pulse tube cryocooler (WE-SP4000) made by DAIKIN needs to examine larger improvement. So we report it about the examination result because I analyzed it about a loss of WE-SP4000 model, and we did improve the efficiency more this time.
