TEYSSIER, D.; RISACHER, C.; DIELEMAN, P.; LAAUWEN, W.; DE JONGE, A.; BRAINE, J.; CARIS, M.; COEUR-JOLY, O.; DELFORGE, B.; HELMICH, F.; HERPIN, Fabrice; HIGGINS, R.; JELLEMA, W.; KLEIN, T.; KOOI, J.; LEINZ, C.; EDWARDS, K.; MARSTON, A.; MORRIS, P.; OLBERG, M.; OSSENKOPF, V.; PEARSON, Justin; ROELFSEMA, P.; SHIPMAN, R.

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TEYSSIER, D.
Herschel Science Center [Madrid]

RISACHER, C.
ESO

DIELEMAN, P.

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Twenty-First International Symposium on Space Terahertz Technology, held March 23-25, 2010 at Oxford University's Said Business Center and the STFC Rutherford Appleton Laboratory, Oxford, UK. National Radio Astronomy Observatory (NRAO), 2010., p.40-45, Twenty-First International Symposium on Space Terahertz Technology, held March 23-25, 2010 at Oxford University's Said Business Center and the STFC Rutherford Appleton Laboratory, Oxford, UK. National Radio Astronomy Observatory (NRAO), 2010., p.40-45, SPACE TERAHERTZ TECHNOLOGY,, 2010, oxford. 2010-03p. 40-45

Résumé en anglais

The Herschel Space Observatory was successfully launched on the 14th of May, 2009, lifting into space the Heterodyne Instrument for the Far-Infrared (HIFI). After the standard early orbit operations on the Space-craft, the instrument was switched on for the first time on the 24th of May, kicking off an instrument Commissioning period of more than a month and a half. We present here the outcome of this Commissioning campaign, including the measured in-flight performance of the instrument. Among the challenges encountered during this period was the need to optimize the stability of the signal provided by the Local Oscillator (LO) chains in some of the frequency bands, in particular that covering the singly Ionized Carbon (C+) line at the upper edge of the HIFI range, and one of the backbones of the science program of the instrument. The same concept also allowed significant improvements in the upper end of the 3b LO chain. Another noticeable achievement was the very good co-alignment measured between the mixer beams in the respective H and V polarizations offered by HIFI, allowing for more than a simple build-in redundancy, as the observing efficiency will really benefits from the combination of the two mixers.< Réduire

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Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804