The Sunrise Chromospheric Infrared spectroPolarimter (SCIP) is an instrument for the third flight of the SUNRISE balloon-borne solar observatory planned for 2022. To verify the high spatial and spectral resolutions required in the balloon flight, the SCIP optical unit was subjected to a thermal-vacuum test in which the SCIP optical unit was installed in a vacuum chamber and was exposed to the thermal environment expected in the flight. We verified the heater control performance and the temperature distribution in the SCIP optical unit and confirmed the optical performance by injecting the laser and white light through a vacuum window.
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