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A helium cooling apparatus includes a liquid helium container which stores liquid helium and a condensation chamber incorporating a condensation heat exchanger for condensing a gas helium into liquid helium. A transfer tube allows the liquid helium container to communicate with the condensation cham

A helium cooling apparatus includes a liquid helium container which stores liquid helium and a condensation chamber incorporating a condensation heat exchanger for condensing a gas helium into liquid helium. A transfer tube allows the liquid helium container to communicate with the condensation chamber. The transfer tube has a gas flow path and a liquid helium flow path independently thereof. When the liquid helium in the liquid helium container is evaporated into gas helium, the gas helium is guided to the condensation chamber through the gas helium flow path. The gas helium is condensed by a condensation heat exchanger into liquid helium. The liquid helium is guided to the liquid helium container through the liquid helium flow path.

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A helium cooling apparatus comprising: (a) a liquid helium container which, in use, stores liquid helium; (b) a condensation chamber incorporating a condensation heat exchanger for condensing gas helium into liquid helium; and (c) a transfer tube for allowing said liquid helium container to communic

A helium cooling apparatus comprising: (a) a liquid helium container which, in use, stores liquid helium; (b) a condensation chamber incorporating a condensation heat exchanger for condensing gas helium into liquid helium; and (c) a transfer tube for allowing said liquid helium container to communicate with said condensation chamber, said transfer tube including a gas helium flow path and a liquid helium flow path that is independent of said gas helium flow path, wherein: (d), when the liquid helium in said liquid helium container is evaporated into gas helium, the gas helium is supplied to said condensation chamber through said gas helium flow path and is condensed by said condensation heat exchanger into liquid helium and the liquid helium is guided to said liquid helium container through said liquid helium flow path and (e) the ratio of (cross-sectional area of the gas helium flow path)/[(cross-sectional area of the gas helium flow path)+(cross-sectional area of the liquid helium flow path)]is between 0.15 and 0.85.