The research and development that attempts to reduce the weight of vehicle and improving the efficiency is advanced by applying high temperature superconducting wire material to the winding of 4 MVA class traction transformer for railroad vehicles. To compose a cooling system that absorbs generation of heat due to AC loss, a refrigerator that has the refrigerating capacity that corresponds to the calorific value becomes indispensable. In this report, we described the result of heat analysis when the development stage of 65 K,1 kW class pulse tube refrigerator combined with the pin pole type heat exchange.

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