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High-resolution spectrograph for the spectroscopic survey telescope

An international team led by The University of Texas and Pennsylvania State University is planning a fiber fed high resolution spectrograph for the Spectroscopic Survey Telescope. Design goals are (1) resolution 60,000 with a fiber diameter greater than 1 arc second, (2) spectral coverage per exposure to the limits permitted by the combined bandpass of the SST and optical fibers and the RQE and area of the CCD. The R (DOT) (phi) product will be maximized by use of a high-blaze angle echelle mosaic and image or pupil slicing while the bandwidth will be maximized using cross dispersion and dichroic beam division in a dual spectrograph with large-area CCDs. Critical issues are cross dispersion and order spacing, sky subtraction, echelle and CCD selection, fiber optic feed, and image or pupil slicing. Proposed methods to achieve the goals and meet the challenges posed by the issues will be presented.