Patent ID: 6164077
Filing Date: 2000-12-26
Classification: F25D,F28D

Abstract:
An apparatus for cooling a load to a cryogenic temperature, comprising:a cold finger of a cryogenic machine, said cold finger having an end cover closing a lateral tube which is thinner than said end cover,a plate for connection with the load, having a surface confronting an outer end surface of said end cover, mechanically separate from said end cover and defining a condensation and vaporization gap with said outer end surface,a capillary pumping element constituted by a pellet of wick-forming porous material, occupying said gap and in contact with the outer end surface and with said plate,wall means defining an enclosure around said cold finger, connecting said plate to a base of the cryogenic machine and accommodating said gap, said wall means having a flexible portion surrounding at least said outer end surface and an end portion of the cold finger which is close to said plate, andgas means in said enclosure, said gas means including at least one gas having a condensation temperature selected responsive to the cryogenic temperature to be given to the load.