Cryostat for superconducting coil - in which several concentric radiation shields with liq. nitrogen surround central liq. helium chamber

摘要

A cryostat, partic. for the superconducting coil of a spectrometer for magnetic core resonance, has a central liquified gas chamber inside a container at room temp. At least one radiation shield lies between the chamber and outer container, and there is >=1 device to keep the shiild(s) at a temp. between those of the chamber and container. There is minimal loss of liquified gas through boiling, and the min. quantity of He is used. Stable construction gives good thermal insulation.