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An Upgraded Red Channel for the Palomar Double Spectrograph

The Palomar Double Spectrograph (DBSP) was installed on the Hale 200-inch telescope in 1982, and its red channel was last refurbished in 1995. In order to modernize the instrument and provide new capabilities, we replaced the red channel’s detector with a deep-depletion CCD manufactured by Lawrence Berkeley National Laboratories. This change increased the spectrograph’s throughput by a factor of 1.5 between 5500 Å and 8000 Å, and well over a factor of 2 at redder wavelengths. The throughput peaks at 37%, remains above 20% through 9500 Å, and remains above 5% through 10200 Å. Because the chip is longer, the spectral range in a single exposure was increased by a factor of 2.5. The new red channel entered into service on 2011 October 27. Subject headings: instrumentation: detectors — instrumentation: spectrographs