The Pre-flight Performance of the Herschel-Heterodyne Instrument for the Far-Infrared (HIFI)

Details The Pre-flight Performance of the Herschel-Heterodyne Instrument for the Far-Infrared (HIFI) The Pre-flight Performance of the Herschel-Heterodyne Instrument for the Far-Infrared (HIFI)

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.2311d&link_type=abstract

American Astronomical Society Meeting 207, #23.11; Bulletin of the American Astronomical Society, Vol. 37, p.1197

Computer Science

Performance

Scientific paper

The Heterodyne Instrument for the Far-Infrared (HIFI) is a high-resolution (>300.000), spectrometer for ESA's Herschel Space Observatory. The instrument is designed to provide a wide and continuous frequency coverage with velocity resolved resolution and high sensitivity. The instrument comprises 5 frequency bands covering 480-1150 GHz with SIS mixers and a sixth dual frequency band for the 1410-1910 GHz range with Hot Electron Bolometer Mixers (HEBM). One frequency band is operating at a time with a single sky-pixel. The Local Oscillator (LO) subsystem consists of a Ka-band synthesiser followed by 14 chains of frequency multipliers, 2 chains for each frequency band. Each frequency band has two mixers operating on orthogonal polarisations. All mixers are designed to have noise performance close to the quantum noise limit. A pair of Auto-Correlators and a pair of Acousto-Optic spectrometers process the two IF signals from the dual-polarisation front-ends and provide instantaneous frequency coverage of 4 GHz, with a set of resolutions (140 KHz to 1 MHz), better than < 0.1 Km/s. We will present the design and the first results of the pre-flight testing and characterization of the instrument.

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