Abstract

We have built and operated the GISMO (the Goddard‐IRAM Superconducting 2‐ Millimeter Observer) at the IRAM 30 m telescope in Spain. GISMO is a 128 element superconducting Transition Edge Sensor (TES) based bolometer camera for the two millimeter (150 GHz) band. The camera uses an 8×16 planar array of multiplexed TES bolometers, which incorporates our Backshort Under Grid (BUG) bolometer array architecture. The major scientific driver for the instrument is to provide the capability to observe galactic and extragalactic dust emission rapidly, in particular from high—z Ultra Luminous Infrared Galaxies (ULIRGs) and quasars. With the background‐limited performance of the detectors, the camera provides significantly greater imaging sensitivity and mapping speed at this wavelength than has previously been possible. We discuss the overall instrument design, including our second‐generation cryogenic optical and detector subsystem.

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