27 June 2006 GREAT: the German first light heterodyne instrument for SOFIA
Author Affiliations +
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.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Urs U. Graf, Urs U. Graf, Stefan Heyminck, Stefan Heyminck, Rolf Güsten, Rolf Güsten, Paul Hartogh, Paul Hartogh, Heinz-Wilhelm Hübers, Heinz-Wilhelm Hübers, Karl Jacobs, Karl Jacobs, Martin Philipp, Martin Philipp, David Rabanus, David Rabanus, Hans-Peter Röser, Hans-Peter Röser, Jürgen Stutzki, Jürgen Stutzki, Peter van der Wal, Peter van der Wal, Armin Wagner-Gentner, Armin Wagner-Gentner, } "GREAT: the German first light heterodyne instrument for SOFIA", Proc. SPIE 6275, Millimeter and Submillimeter Detectors and Instrumentation for Astronomy III, 62750K (27 June 2006); doi: 10.1117/12.673168; https://doi.org/10.1117/12.673168

Back to Top