Cryostat for Thermal Measurements between 2–300°K

Abstract

A modification of the Giauque-Johnston cryostat for thermal measurements in the temperature range 2–300°K has been designed and constructed. The cryostat utilizes efficient heat switches for cooling. A variable temperature regulated radiation shield between the cold wall and the inner sections of the cryostat leads to a working section which can be maintained to a millidegree at any temperature in the working range of the cryostat. The operation and performance of the cryostat are described.