Regenerator and cooling memory cooling system, the same used

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Alloy metal plates (3) of thickness 0.03-2.0 mm are packed in a drum (2) of a regenerator. The cooling medium flows through the drum, to maintain low temperature. The metal plate has 10% or more of rare earth elements. Independent claims are also included for the following : (a) Thermal storage refrigerator; (b) Superconducting magnet; (c) Magnet resonance imaging apparatus; (d) Cryopump; (e) Magnetic field single crystal