Oxford Instruments (uk) Ltd.

Vladimir Andreyevich Mikheev

Timothy John Foster

Graham John Batey

Jeremy Philip White

A dilution refrigerator includes a still; a mixing chamber; a pump to pump coolant from the still through a still outlet port and a heat exchanger connected between the still and mixing chamber whereby coolant flows under the assistance of the pump from the still to the mixing chamber and from the mixing chamber to the still through respective first and second adjacent paths in the heat exchanger. An access path extends to the mixing chamber. A probe is provided for insertion along the access path, the probe having a displacer which substantially fills the cross-section of the access path in use. Any coolant from the mixing chamber which flows along the access path past the displacer can flow from the access path into the still. The still outlet port is separate from the access path.

Dilution refrigerator

A refrigerator for cooling a sample comprises a container for holding liquid helium refrigerant to cool the sample. First cooling means is provided for cooling a condensation region with liquid helium coolant whereby helium refrigerant condenses on the condensation region and collects in the container. A sorption pump pumps gaseous helium refrigerant from the container. Second cooling means is provided for cooling the sorption pump with the liquid helium coolant. The first and second cooling means are connected in series with a source of the liquid helium coolant.

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Oxon, United Kingdom

Vladimir Andreyevich Mikheev