Anisotropic heat flux management via non-uniform fin topology

A cooling chamber assembly comprising:

• an aluminum payload chamber defining an internal volume configured to receive temperature sensitive contents, the aluminum payload chamber including a wall region;
• a finned interface component thermally coupled to the wall region of the aluminum payload chamber, the finned interface component including a thermally conductive base plate and a fin array extending from the thermally conductive base plate;
• a hydrocarbon thermal control material layer disposed on at least one aluminum thermal surface selected from the group consisting of an aluminum surface of the aluminum payload chamber, an aluminum surface of the thermally conductive base plate, and an aluminum surface of one or more fins of the fin array;
• a coupling plate region disposed on the finned interface component, the coupling plate region defining a mounting footprint for a semiconductor heat transfer element;
• an outer enclosure disposed around at least a portion of the aluminum payload chamber, the outer enclosure defining an interface opening aligned with the coupling plate region such that the coupling plate region is accessible through the interface opening for assembly of a heat extraction assembly;
• and
• the semiconductor heat transfer element thermally coupled to the coupling plate region and configured to transfer heat between a first side thermally coupled to the coupling plate region and a second side thermally coupled to the heat extraction assembly,
• wherein the fin array defines a stepped pyramidal fin geometry in which at least one of fin height and fin length varies as a function of position across the fin array such that a central region of the fin array has greater effective heat transfer capacity than a peripheral region of the fin array, and
• wherein the stepped pyramidal fin geometry and the hydrocarbon thermal control material layer cooperate to laterally redistribute heat within the finned interface component and to reduce localized heat flux density presented to the coupling plate region.