CUTTAIA, FRANCESCOFRANCESCOCUTTAIATERENZI, LUCALUCATERENZISANDRI, MAURAMAURASANDRI2024-06-202024-06-202008http://hdl.handle.net/20.500.12386/35204During RAA FM tests, several doubtful behaviours have been observed, related both to the Thermal and Radiometric characterization of the SKY LOAD (SKL). In particular, they can be summarized as follows: - very large thermal offset between the sensor on the metal plate backing the SKL (named SKL1 and 2, following the LAMA nomenclature) and the sensor put on a central pyramid (ECCOSORB) of the SKL. - strange behaviour of the sensor put on the ECCOSORB panel side: its offset with respect to the SKL1/2 changes largely from COLD to HOT state, beginning also negative above a certain soil (TBD). - Noise temperatures much lower than expected. Values found at RAA level (basing on sensors put on the ECCOSORB) are very far from RCA results and, for several channels that are believed to not work properly, should be considered at least unrealistic. It was required from the Scientific Team to attempt a first level analysis in order to give an estimation of uncertainty tied with : Expected temperatures read from sensors Expected temperature ‘seen’ from the radiometers. The output of this work should provide an answer about the possibility of using the sensor SKL1/2 as input to perform the analysis of RAA radiometric properties, in the case of effective failure of the ECCOSORB sensors. An accurate analysis can not be performed in a few days but requires more accurate investigations: because of that, it will be provided here an estimation of the expected uncertainty on temperature observed from the feedhorn when the SKL1/2 sensor only are used. The global analysis foresees the matching between a Thermal and Radiometric investigation: the two models will be here presented firstly separately and results will be at the end related in order to fix a uncertainty in Detectors properties. Models bases either on computational analysis and experimental results. The document flow will be: Design definition Thermal Model Radiometric Model Mix of the two models and impact on Detectors properties. ConclusionsELETTRONICOenResearch reportFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_17 Instrumentation – telescopes, detectors and techniques