| 摘要 |
<p>PURPOSE:To reduce coolant filling amount by forming a pipe of limited length opened with a vacuum unit between an inner tank and an outer tank at one end in the inner tank. CONSTITUTION:Coolant (liquid helium) 4 is filled in the inner tank 1 of a cryogenic vessel formed of the inner tank 1, an outer tank 2 and a vacuum unit 3 between both to cool an article to be cooled (superconductive magnet) 5. A pipe 9 opened at 10 at one end with vacuum unit 3 is provided in the tank 1, and filling amount of coolant 4 is reduced. Since the thickness of the pipe is extremely small and good, the filling amount of liquid helium can be reduced at the cooling time of 300K to 4.2K.</p> |
