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Herschel/HIFI In-flight commissioning and performance

D. Teyssier ; C. Risacher ; P. Dieleman ; W. Laauwen ; A. de Jonge ; J. Braine ; M. Caris ; O. Coeur-Joly ; B. Delforge ; F. Helmich ; F. Herpin ; R. Higgins ; W. Jellema ; T. Klein ; J. Kooi ; C. Leinz ; K. Edwards ; A. Marston ; P. Morris ; Michael Olberg (Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium) ; V. Ossenkopf ; J. Pearson ; P. Roelfsema ; R. Shipman
21st International Symposium on Space Terahertz Technology 2010, ISSTT 2010; Oxford; United Kingdom; 23 March 2010 through 25 March 2010 p. 23-28. (2010)
[Konferensbidrag, refereegranskat]

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.

Nyckelord: Build-in redundancy, Herschel space observatories, Heterodyne instruments, In-flight performance, Instrument commissioning, Local oscillators, Observing efficiency, Optimize the stabilities, C (programming language), Chains, Frequency bands, Mixers (machinery), Instruments

Denna post skapades 2016-05-12.
CPL Pubid: 236459


Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Onsala rymdobservatorium


Astronomi, astrofysik och kosmologi

Chalmers infrastruktur