Dilution refrigerator

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Dilution refrigerator

 What is a dilution refrigerator?
With no moving parts in the low-temperature area, a Dilution refrigerator is a cryogenic device that continuously cools to temperatures as low as 2 mK. The heat produced during mixing helium-3 and helium-4 isotopes serve as the cooling power.
 
Dilution refrigerators have been used for decades to cool down devices as small as semiconductors to as heavy as 3-ton gravitational wave detectors, reaching temperatures in the milliKelvin (mK) range.

Source : ingexploration