The Heterodyne Spectrometer Instrument (HSI) is one of two instruments designed for the Far-IR Spectroscopy Space Telescope (FIRSST) recently proposed to NASA in response to the Astrophysics Probe Explorer call. HSI will be the first THz cryogenic heterodyne array receiver implemented for a space mission. It has extremely high spectral resolving power (R>10^6) in order to allow detailed spectral observations. HSI covers a very wide bandwidth range between 150 and 600 microns in only 3 bands, each equipped with two 5-pixel arrays. HSI enables highly sensitive dual-polarization, multi-pixel and multi-frequency observations on a space telescope, by a careful design and by employing low-heat dissipating, low-power, but high TRL components.
The Submillimetre-Wave Instrument (SWI) is a passive microwave spectrometer of JUpiter ICy moons Explorer (JUICE), a large-class mission of ESA's Cosmic Vision. It consists of two 600 GHz and 1200 GHz dual channel radiometers that involve compact, non-cryogenic Schottky diodes based solid-state devices for the mixer and last stage local oscillator frequency multipliers that are passively cooled to 150K. In this paper we will present the exhaustive qualification and endurance testing of the 300 GHz doubler element, standing at the interface between the warm (300K) and cold (150K) electronic front-end for both 600GHz and 1200 GHz channels. We present its associated extensive set of screening and lot acceptance testing as a part of the delivery of the final MMIC subcomponents integrated in the flight and flight spare models including the test structures used, the tests conditions as well as the failure criteria (PDA, allowable drifts).
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