Supercam: A 64 pixel superheterodyne camera

Christopher Groppi, Christopher Walker, Craig Kulesa, Dathon Golish, Patrick Pütz, Paul Gensheimer, Abby Hedden, Shane Bussmann, Sander Weinreb, Niklas Wadefalk, Glenn Jones, Joseph Barden, Hamdi Mani, Tom Kuiper, Jacob Kooi, Art Lichtenberger, Gopal Narayanan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations


We report on the development of SuperCam, a 64 pixel, superheterodyne camera designed for operation in the astrophysically important 870 μm atmospheric window. SuperCam will be used to answer fundamental questions about the physics and chemistry of molecular clouds in the Galaxy and their direct relation to star and planet formation. The advent of such a system will provide an order of magnitude increase in mapping speed over what is now available and revolutionize how observational astronomy is performed in this important wavelength regime. Unlike bolometric detectors, heterodyne receiver systems are coherent, retaining information about both the amplitude and phase of the incident photon stream. From this information a high resolution spectrum of the incident light can be obtained without multiplexing. SuperCam will be constructed by stacking eight, 1x8 rows of tunerless, SIS mixers. The IF output of each mixer will be connected to a low-noise, broadband MMIC amplifier integrated into the mixer block. The instantaneous IF bandwidth of each pixel will be ~2 GHz, with a center frequency of 5 GHz. A spectrum of the central 500 MHz of each IF band will be provided by the array spectrometer. Local oscillator power is provided by a frequency multiplier whose output is divided between the pixels by using a matrix of waveguide power dividers. The mixer array will be cooled to 4K by a closed-cycle refrigeration system. SuperCam will reside at the Cassegrain focus of the 10m Heinrich Hertz telescope (HHT) with a dedicated reimaging optics system. We report on single pixel integrated LNA testing, cryogenic system testing, performance of the prototype backend spectrometer module, and the fabrication of the first 1x8 array module. This module will be tested on the HHT in 2006, with the first engineering run of the full array in late 2007. The array is designed and constructed so that it may be readily scaled to higher frequencies.

Original languageEnglish (US)
Title of host publication17th International Symposium on Space Terahertz Technology 2006, ISSTT 2006
PublisherInternational Symposium on Space Terahertz Technology
Number of pages4
ISBN (Print)9781604239751
StatePublished - 2006
Externally publishedYes
Event17th International Symposium on Space Terahertz Technology 2006, ISSTT 2006 - Paris, France
Duration: May 10 2006May 12 2006

Publication series

Name17th International Symposium on Space Terahertz Technology 2006, ISSTT 2006


Other17th International Symposium on Space Terahertz Technology 2006, ISSTT 2006


  • Submillimeter heterodyne array

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering
  • Space and Planetary Science
  • Atomic and Molecular Physics, and Optics
  • Radiation


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