Speaker
Description
Cryogenic radiators are often required to cool down sensitive, high precision instruments to their optimal operation temperature. However, IR emissivity of thermo-optical coatings below 140K tends to drop rapidly, making it difficult to comply with scientific requirements, when radiative area is limited by design constraints. A potential solution is to exploit cavity effect, that can increase effective emissivity of a given area pending on cavity geometry and IR reflectivity of cavity surfaces. In this presentation it will be demonstrated how the radiative performance can be maximized at cryogenic temperature using an open cell honeycomb. The presentation will include aspects of coating selection and geometrical design of ARIEL Instrument Radiator considering the key design drivers.