The science goals of current and upcoming large telescopes require the highest level of adaptive optics (AO) performance. To address these requirements, an electron-multiplying CCD (EMCCD), the HNü240, has been developed based on the Teledyne-e2v CCD220 240x240 pixel detector with Nüvü Caméras’ re-designed EMCCD electronics. The HNü240 delivers a full-detector frame rate of up to 3015 frames per second with 35.5 𝜇s first-pixel latency, sub-electron noise and flexible readout sequences that can be tailored to different wavefront sensor designs. The sealed-body design and fully airless cooling prevent unwanted airflow while eliminating thermal gradients on the camera body. Details of the HNü240’s design, performance results and applications to AO systems in exoplanet detection, quantum key distribution and space situational awareness will be discussed.
The Nancy Grace Roman Space Telescope Coronagraph is a JPL-led space-based instrument that will be the most sensitive instrument ever built for direct imaging and characterization of exoplanets in the visible. The instrument contrast is expected to be better than 1e-9, which implies that it will be capable of seeing exoplanets with an apparent magnitude < 30. With such a low brightness, only a few photons per hour will be perceived by its optical detectors. Two cameras will be used on the instrument for wavefront sensing, direct imaging and spectroscopy, with frame rates ranging from 1000 fps to less than 0.01 fps. For such a broad range of operating modes and industry leading noise figure, JPL has selected the 1024x1024 CCD201- 20 EMCCD from Teledyne-e2v as the image sensor for the two coronagraph cameras and appealed to Nüvü Caméras to adapt its most recent space controller design for the mission specifics. The new version of the camera readout electronics co-developed with ABB Space System group brings important improvements over the version flown at the edge of space in CSA’s 2018 STRATOS campaign namely on reliability, functionality, thermal control, power, volume and mass whilst preserving its unique noise performance. This paper presents an overview of the project and addresses the development of the delivered flight modules.
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