21 July 2008 Design and performance of a high-throughput cryogenic detector system
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Abstract
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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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KEYWORDS
Sensors

Optical filters

Aluminum

Silicon

Telescopes

Bolometers

Cryogenics

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