| abstract |
(57) Abstract: An object of the present invention is to provide a cryogenic heat-insulating container in which a heat shield is cooled to a sufficiently low temperature, the amount of heat infiltration due to heat radiation is reduced, and the amount of evaporation of liquid helium is reduced. I do. A radiation shield fixed to a flange that has a narrow copper member narrowed in a direction of a low-temperature portion formed on both surfaces of an insulating substrate, a radiation shield cooled by a refrigerator, and the radiation shield cooled by the refrigerator. Combine with the outer periphery of the support. Reduce the thermal resistance of the heat shield plate, reduce the width of the thin copper member near the sensor, reduce magnetic noise, and Provided is a weak magnetic field measurement dewar in which a heat shield plate capable of sufficiently cooling is stably arranged to reduce the amount of refrigerant evaporated. |