Patent ID: 8826674

Claim:
A cryostat for electrical power conditioner comprising: at least one external wall; at least one internal wall defining a volume to be cooled; a thermally insulating gap between the at least one external wall and the at least one internal wall, wherein at least one part of the at least one internal wall, and optionally at least one part of the at least one external wall, comprises a layered structure, which layered structure comprises: a discontinuous layer; a continuous layer comprising a metal and having a surplus in length in at least one longitudinal direction; a plurality of channels extending between a free space positioned between the continuous layer and the discontinuous layer and the thermally insulating gap; and the continuous layer has a thickness (t) given by the equation: t=[k*P*R /(2*σ)]+ g where t (in mm) is the thickness of the continuous layer, k is an experimental coefficient in the range from 0.8 to 2.5, P (in MPa) is a differential pressure between the pressure of an ambient medium acting on the external wall and the pressure of a cooled medium arranged within the internal wall, R (in mm) is a radius of curvature of the continuous layer between two adjacent formers, σ (in MPa) is a maximal tensile stress of the material of the continuous layer, and g=0.002 mm.