IntroductionThe Kast Double Spectrograph is used at the cassegrain focus of the Shane 3-m Telescope. It is two separate spectrographs - one optimized for the red, the other for blue - housed in a single structure and having some components in common. Each side offers a selection of dispersive elements for various resolutions and dispersions, and both are also capable of direct imaging over a limited field. Dichroic beamsplitters and separate CCD detectors allow simultaneous observations in red and blue. A polarimeter is also available for spectropolarimetry observations.
Sept 18, 2016: The Red side CCD had been replaced with a new Hamamatsu detector, yielding significantly better QE for wavelengths greater than 5000 A. Readout noise is also significantly reduced. The new detector is larger, so the wavelength coverage in a single image is increased by about 20%. The Hamamatsu detector is a thick chip, so fringing is not evident (especially compared to the previous Reticon thinned CCD), except out towards 1 micron wavelengths.
The Kast has been in operation since early 1992. It was designed by Dr. Joseph Miller (UCSC) and built in the Lick Observatory shops. The instrument was made possible by a generous gift from William and Marina Kast. Much of the material presented here is taken nearly verbatim from Lick Observatory Technical Reports No. 66, The Kast Double Spectrograph, by Joseph Miller and Remington Stone, with updated sections and additional material contributed by the technical staff on Mount Hamilton. The Kast Spectrograph is available to the University of California astronomical community by subscription.
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