Patent ID: 8554294

Claim:
A low-noise cooling apparatus comprising: a Dewar including an outer container and an inner container containing a liquid refrigerant; a prepolarization coil disposed inside the inner container and immersed in the liquid refrigerant; a pick-up coil immersed in the liquid refrigerant; and a superconducting quantum interference device (SQUID) electrically connected to the pick-up coil and immersed in the liquid refrigerant, wherein the prepolarization coil is made of a superconductor, wherein a gap between the outer container and the inner container is functioned as a thermal insulation layer in vacuum, wherein a sample is magnetized by the prepolarization coil and becomes a measurement target of the pick-up coil, and wherein the Dewar has a concave shape with a recessed space in which the sample is disposed.