Abstract: A cooling apparatus comprises a pulse tube refrigerator (A) having a pressure source (1), a cold reservoir (6), a condenser (7), a pulse tube (9), a radiator (1), and a phase adjuster (12); and a low-temperature container having a liquid reservoir (21) fixed to a vacuum tank (31) through heat-insulating support members (36) and (37). The condenser (7) is fixed to a cold end (6b) of the cold reservoir (6), and is disposed in a gas phase portion (21a) of the liquid reservoir (21). A hot end of the pulse tube (9) is fixed to the vacuum tank (31) and is disposed in such a manner that a cold end (9b) of the pulse tube (9) is located lower than the hot end and is located in a liquid phase portion (21b) of the liquid reservoir (21). The cold end (9b) of the pulse tube (9) is disposed outside the liquid reservoir (21) but within the vacuum tank (31), and the cold end (9b) of the pulse tube (9) and the condenser (7) communicate with each other through piping (8).

Abstract: A pulse tube refrigerating machine, comprising a pulse tube (11) connected to a regenerator (9) and having a hot end part (11a) being heated, in which a cooling device (30), for cooling the hot side tube wall (11cd) of the pulse tube by cooling medium lower in temperature than the hot side tube wall of the pulse tube, cools the hot side tube wall (11cd) of the pulse tube by coolant flowing from the pressure source (1) of the pulse tube refrigerating machine into the regenerator (9).

Abstract: A pulse tube refrigerating machine, comprising a pulse tube (11) connected to a regenerator (9) and having a hot end part (11a) being heated, in which a cooling device (30), for cooling the hot side tube wall (11cd) of the pulse tube by cooling medium lower in temperature than the hot side tube wall of the pulse tube, cools the hot side tube wall (11cd) of the pulse tube by coolant flowing from the pressure source (1) of the pulse tube refrigerating machine into the regenerator (9).