| 摘要 |
PROBLEM TO BE SOLVED: To enhance reliability of a cooler while maintaining a cooling efficiency at least same as in the conventional device and to continuously operate the cooler for a long period by using a pulse tube refrigerator having no movable unit such as a piston or the like reciprocating in a low temperature portion and a cooling circuit. SOLUTION: The cooler comprises a pulse tube refrigerator A1 having no movable unit in a low temperature portion, and a main circuit B1 having no movable unit in a low temperature portion for cooling a material 83 to be cooled. The circuit B1 fundamentally has a pumping means 71 arranged in an ambient temperature environment and a main circuit for feeding refrigerant between the means 71 and a heat exchanger 7 for cooling the material 83, and has a branch circuit C1 for combining at a joining point Q2 between a discharge side of the means 71, a counterflow type heat exchanger 73 and a counterflow type heat exchanger 74. The refrigerant of the circuit B1 is branched from a discharge side to the circuit C1 and a high pressure side channel 73a of the exchanger 73 via the means 71 arranged in the environment.
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