| 摘要 |
PROBLEM TO BE SOLVED: To provide an environment in which a very low temperature can be kept for a long time in a state free from mechanical vibration generated from a freezing machine after the stop of the freezing machine, and the temperature variation. SOLUTION: This cryogenic vessel 40 is provided with helium gas chambers 42, 42 storing a helium gas, a condenser chamber 44 for liquefying the helium gas, a liquid helium chamber 46 for storing the liquefied helium, a helium gas introducing pipe 50 for introducing the necessary amount of helium gas at a normal temperature, and an introduced gas sealing part 52 for sealing the introduced helium gas. COPYRIGHT: (C)2004,JPO
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