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Proceedings Paper

GREAT: the German first light heterodyne instrument for SOFIA
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Paper Abstract

GREAT, the German REceiver for Astronomy at Terahertz frequencies, is a first generation SOFIA dual channel heterodyne PI-instrument for high resolution spectroscopy. The system is developed by a consortium of German research institutes. The receiver will allow simultaneous observations in two out of the following three far-infrared frequency bands: a 1.4-1.9 THz channel for e.g. the fine-structure line of ionized carbon [CII] at 158μm; a 2.4-2.7 THz channel for e.g. the 112μm transition of HD; and a 4.7 THz channel for the 63 μm fine-structure line of neutral atomic oxygen. Hot electron bolometers (HEB) mixers provide state of the art sensitivity. A spectral resolving power of up to 108 is achieved with chirp transform spectrometers, and a total bandwidth of 4 GHz at 1 MHz resolution is reached with wide band acousto-optical spectrometers. The modular concept of GREAT allows to observe with any combination of two out of the three channels aboard SOFIA. A more complete frequency coverage of the THz regime by adding additional GREAT channels is possible in the future. The adaptation of new LO-, mixer- or backend-techniques is easily possible. We describe details of the receiver and the results of first performance tests of the system at 1.9 THz.

Paper Details

Date Published: 27 June 2006
PDF: 7 pages
Proc. SPIE 6275, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, 62750K (27 June 2006); doi: 10.1117/12.673168
Show Author Affiliations
Urs U. Graf, Univ. zu Köln (Germany)
Stefan Heyminck, Max-Planck-Institut für Radioastronomie (Germany)
Rolf Güsten, Max-Planck-Institut für Radioastronomie (Germany)
Paul Hartogh, Max-Planck-Institut für Sonnensystemforschung (Germany)
Heinz-Wilhelm Hübers, DLR, Institut für Planetenforschung (Germany)
Karl Jacobs, Univ. zu Köln (Germany)
Martin Philipp, Univ. zu Köln (Germany)
David Rabanus, Univ. zu Köln (Germany)
Hans-Peter Röser, Univ. Stuttgart (Germany)
Jürgen Stutzki, Univ. zu Köln (Germany)
Peter van der Wal, Max-Planck-Institut für Radioastronomie (Germany)
Armin Wagner-Gentner, Univ. zu Köln (Germany)

Published in SPIE Proceedings Vol. 6275:
Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III
Jonas Zmuidzinas; Wayne S. Holland; Stafford Withington; William D. Duncan, Editor(s)

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