helium refrigerator การใช้

To achieve this, Jefferson Lab houses the world's largest liquid helium refrigerator, and it was one of the first large-scale implementations of SRF technology.
The expected signal from axion decay is so small that the entire experiment is cooled to well below 4.2 kelvin with a liquid helium refrigerator to minimize thermal noise.
The refrigerated transport dewar was based on a design by the Arthur D . Little Company and produced by the Cambridge Corporation using a closed cycle helium refrigerator, the 2000 liters of liquid hydrogen could be stored or transported indefinitely with no loss as long as the refrigerator was operated.
It is expected to be only a few parts-per-billion change in the polarization of the already-cold CMB with a mean temperature of 2.725 K . To measure such a small signal, CLASS will employ focal plane arrays with large numbers of cryogenic helium refrigerators.