Patent ID: 8868146
Filing Date: 2014-10-21
Classification: F17C,F25B,F25D,G01R

Abstract:
1. A re-condensation device provided in a magnetic field producing unit including a liquid helium tank that contains a superconducting magnet and liquid helium that cools the superconducting magnet, a neck tube that protrudes upward from the liquid helium tank, and at least one covering member that covers the liquid helium tank from an outside of the liquid helium tank and that has an outside contact part that is in thermal contact with the neck tube from an outside of the neck tube, the re-condensation device re-condensing the liquid helium, the re-condensation device comprising: a chiller that includes a first cooling stage and a second cooling stage, a temperature of the second cooling stage being decreased to a temperature lower than a temperature of the first cooling stage; a second cooling member that is thermally connected to the second cooling stage, at least a portion of the second cooling member being inserted into the neck tube so as to re-condense the liquid helium; and a first cooling member that is thermally connected to the first cooling stage, at least a portion of the first cooling member being inserted into the neck tube, wherein the first cooling member has a first insertion part having a diameter, with which the first insertion part is able to be inserted into the neck tube, and an inside contact part provided on an outer side surface of the first insertion part so as to cool the covering member through contact with a portion of the neck tube from an inside of the neck tube.