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C. J. Bebek (Cornell), SNAP Collaboration
The primary design driver for the SuperNova/Acceleration Probe (SNAP) instrument suite is the need to perform the set of observations required to control the measurement systematics of the cosmological parameters. The SNAP SNe discovery and photometric followup goals can be met with two imagers: an optical imager spanning 350nm to 1000nm mapped to a one square degree field of view and a smaller near-IR imager spanning 1000nm to 1700nm. For spectrographic followup studies, two 2" x 2" integral field unit spectrographs are used to cover the optical and near-IR wavelength ranges. The optical imager will contain one billion pixels and will use high-resistivity, p-channel, fully-depleted, back-illuminated CCDs. These devices have excellent quantum efficiency over the entire optical wavelength range out to 1000 nm and are expected to have high tolerance to radiation exposure. The near-IR instruments will rely on HgCdTe devices. Each of these instruments is now being optimized to best fulfill the mission's observation requirements.