Large Focal Plane Array Cryogenic Integration Technology

"The objective of this Phase I SBIR proposal is to demonstrate the feasibility of utilizing high-pressure helium contained within a dual-volume system as the basis for future 10 K cryogenic thermal storage units (CTSUs). The motivation for developing 10 KCTSU technology stems from the high specific input power needed for 10 K cryocoolers (~1000 W/W) in concert with: (a) anticipated heat loads (~1.5 W) of large infrared focal plane arrays operating at 10 K; and (b) a need that the focal plane arrays remainisothermal for optimum performance. To reduce input power from 1.5 kW (or more) to more manageable levels of several hundred watts, large focal plane arrays will need to be duty-cycled. To enable duty-cycling without incurring performance-degradingvariations in focal plane temperature, CTSUs operating at (or slightly less than) 10 K are a practical necessity. The ultimate objective for this SBIR program is to develop, demonstrate, and commercialize 10 K CTSU technology. In Phase I, we will developpotential concepts and evaluate concept feasibility. In Phase II, we will design, manufacture, and test a subscale, weight/volume optimized, proof-of-concept breadboard test unit. In Phase III, we will transition the technology into government and/orcommercial use. The main contribution of the 10 K CTSU to the DoD is that future missions with 10 K detectors may not be feasible from system power standpoint and/or cooler availability standpoin