29 July 2016 The TESS camera: modeling and measurements with deep depletion devices
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Abstract
The Transiting Exoplanet Survey Satellite, a NASA Explorer-class mission in development, will discover planets around nearby stars, most notably Earth-like planets with potential for follow up characterization. The all-sky survey requires a suite of four wide field-of-view cameras with sensitivity across a broad spectrum. Deep depletion CCDs with a silicon layer of 100 μm thickness serve as the camera detectors, providing enhanced performance in the red wavelengths for sensitivity to cooler stars. The performance of the camera is critical for the mission objectives, with both the optical system and the CCD detectors contributing to the realized image quality. Expectations for image quality are studied using a combination of optical ray tracing in Zemax and simulations in Matlab to account for the interaction of the incoming photons with the 100 μm silicon layer. The simulations include a probabilistic model to determine the depth of travel in the silicon before the photons are converted to photo-electrons, and a Monte Carlo approach to charge diffusion. The charge diffusion model varies with the remaining depth for the photo-electron to traverse and the strength of the intermediate electric field. The simulations are compared with laboratory measurements acquired by an engineering unit camera with the TESS optical design and deep depletion CCDs. In this paper we describe the performance simulations and the corresponding measurements taken with the engineering unit camera, and discuss where the models agree well in predicted trends and where there are differences compared to observations.
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Deborah F. Woods, Deborah F. Woods, Roland Vanderspek, Roland Vanderspek, Robert MacDonald, Robert MacDonald, Edward Morgan, Edward Morgan, Joel Villasenor, Joel Villasenor, Carolyn Thayer, Carolyn Thayer, Barry Burke, Barry Burke, Christian Chesbrough, Christian Chesbrough, Michael Chrisp, Michael Chrisp, Kristin Clark, Kristin Clark, Gabor Furesz, Gabor Furesz, Alexandria Gonzales, Alexandria Gonzales, Tam Nguyen, Tam Nguyen, Gregory Prigozhin, Gregory Prigozhin, Brian Primeau, Brian Primeau, George Ricker, George Ricker, Timothy Sauerwein, Timothy Sauerwein, Vyshnavi Suntharalingam, Vyshnavi Suntharalingam, } "The TESS camera: modeling and measurements with deep depletion devices", Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 99042C (29 July 2016); doi: 10.1117/12.2231296; https://doi.org/10.1117/12.2231296
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