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    • Liger at W.M. Keck Observatory: Assembly, Integration, and Testing

    Aaron M. Brown,Shelley A. Wright,James Wiley,Reston B. Nash,Bob Weber,Evan Kress,Renate Kupke,James E. Larkin,Maren Cosens,Michael P. Fitzgerald,Marc Kassis,Chris Johnson,Tucker Jones,Kenneth Magnone,Rosalie McGurk,Eric Wang, Kanaka Warad,Sherry Yeh

    GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY X（2024）

    Univ Calif San Diego

    Cited 0|Views6
    Abstract
    Liger is an adaptive optics (AO)-fed imager and integral field spectrograph (IFS) designed for W.M. Keck Observatory. Liger will be coupled with the Keck All-sky Precision Adaptive-optics (KAPA) upgrade which will allow both systems to fully utilize their capabilities to maximize scientific return for the broader community. Liger features a custom-designed imaging camera that sequentially feeds the pristine AO image to two select-able integral field spectrograph (IFS) modes: an image slicer for coarse spatial sampling and a lenslet array for finer spatial scales. Both IFS modes utilize a final "camera" three-mirror anastigmat (TMA) and a Hawaii 4RG detector for data collection. This paper will discuss the assembly, integration, and testing (AIT) of the Liger instrument sub-assemblies. The project is currently in the first of two-fabrication phases where we are manufacturing, assembling, and testing the complete imager system, the IFS camera TMA, grating turret mechanism, and the IFS re-imaging optics mechanisms. The second fabrication phase will include the final fabrication and assembly of the IFS and science cryostat. An integration phase will follow where the full instrument is assembled and integrated into the science cryostat. Once complete the Liger instrument will be shipped to Hawaii for final assembly, integration, and verification at W.M. Keck Observatory.
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    Key words
    Near-infrared,Spectroscopy,Integral Field Spectrograph,Imager,Adaptive Optics,Astrometry,Photometry,Cryogenic
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