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We present the design of SCALES (Slicer Combined with Array of Lenslets forExoplanet Spectroscopy) a new 2-5 micron coronagraphic integral fieldspectrograph under construction for Keck Observatory. SCALES enableslow-resolution (R~50) spectroscopy, as well as medium-resolution (R~4,000)spectroscopy with the goal of discovering and characterizing cold exoplanetsthat are brightest in the thermal infrared. Additionally, SCALES has a 12x12"field-of-view imager that will be used for general adaptive optics science atKeck. We present SCALES's specifications, its science case, its overall design,and simulations of its expected performance. Additionally, we present progresson procuring, fabricating and testing long lead-time components.

Design of SCALES: A 2-5 Micron Coronagraphic Integral Field Spectrograph for Keck Observatory