Abstract
The Submillimeter Wave Instrument (SWI) is a spectrometer/radiometer instrument on board of Jupiter Icy Moons Explorer (JUICE) mission operating in two submillimeter heterodyne bands around 530 μm (530 – 625 GHz) and 255 μm (1080 – 1275 GHz). The paper presents the results of acceptance testing and performance optimization carried out on the flight and spare model of the 1200 GHz receiver front-end. The safe operation conditions at 120-150 K ambient temperature, such as maximum authorized input RF power, applied DC bias voltage are determined through the definition of the Schottky junctions dissipated power and current density ranges. A tuning procedure that optimizes the sensitivity of the front-end while keeping it within safe limits at 120-150K temperature operation is discussed. In part II, we present a detailed analysis of reliability and endurance testing.
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