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9 August 2016 iSHELL: a construction, assembly and testing
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Abstract
iSHELL is 1.10-5.3 μm high spectral resolution spectrograph being built for the NASA Infrared Telescope Facility on Maunakea, Hawaii. Dispersion is accomplished with a silicon immersion grating in order to keep the instrument small enough to be mounted at the Cassegrain focus of the telescope. The white pupil spectrograph produces resolving powers of up to R=75,000. Cross-dispersing gratings mounted in a tilt-able mechanism allow observers to select different wavelength ranges and, in combination with a slit wheel and Dekker mechanism, slit lengths ranging from 5ʺ″ to 25ʺ″. One Teledyne 2048x2048 Hawaii 2RG array is used in the spectrograph, and one Raytheon 512x512 Aladdin 2 array is used in a slit viewer for object acquisition and guiding. First light is expected in mid-2016. In this paper we discuss details of the construction, assembly and laboratory testing.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John Rayner, Alan Tokunaga, Dan Jaffe, Morgan Bonnet, Greg Ching, Mike Connelley, Dan Kokubun, Charles Lockhart, and Eric Warmbier "iSHELL: a construction, assembly and testing", Proc. SPIE 9908, Ground-based and Airborne Instrumentation for Astronomy VI, 990884 (9 August 2016); https://doi.org/10.1117/12.2232064
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