21 July 2008 Design and performance of a high-throughput cryogenic detector system
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The Goddard IRAM Superconducting Millimeter Observer (GISMO) is a new superconducting bolometer array camera for the IRAM 30 Meter Telescope on Pico Veleta, Spain. GISMO uses a 3He/4He cooler mounted to a liquid He/LN2 cryostat to cool the bolometer array and SQUID electronics to an operating temperature of 260mK. The bolometer array is based on the backshort-under-grid architecture and features 128 2mm square absorbing pixels. A 101mm diameter anti-reflection coated silicon lens is used to define the beam. A single cold pupil stop prevents warm radiation from reaching the array, but no other stops are used. In the beam, filters and a cold baffling and stray light suppression system were used to define the bandpass and prevent out-of-band radiation to a very high level, including out-of-band radiation leaking through the metal-mesh filters from extreme angles. We present a detailed description of this optical design and its performance. A comprehensive report of the electronics and cryogenic integration are also included.
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Elmer H. Sharp, Dominic J. Benford, Dale J. Fixsen, Stephen F. Maher, Catherine T. Marx, Johannes G. Staguhn, Edward J. Wollack, "Design and performance of a high-throughput cryogenic detector system", Proc. SPIE 7020, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy IV, 70202L (21 July 2008); doi: 10.1117/12.790058; https://doi.org/10.1117/12.790058


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