Joint HIFI-ALMA Calibration Discussion, Leiden, December, 19 th, 2002 C. Kramer, KOSMA Beam properties of HIFI/Herschel Contribution to the framework document.

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Presentation transcript:

Joint HIFI-ALMA Calibration Discussion, Leiden, December, 19 th, 2002 C. Kramer, KOSMA Beam properties of HIFI/Herschel Contribution to the framework document of the HIFI/Herschel Calibration group Carsten Kramer KOSMA, Universität zu Köln Version 0.3, November 26th, 2002

Joint HIFI-ALMA Calibration Discussion, Leiden, December, 19 th, 2002 C. Kramer, KOSMA Beam properties of HIFI/Herschel Blockage, i.e. projection of hexapod, secondary, and secondary frame Diameter of primary: 3.5m Effective aperture diameter: 3.28m Diameter of secondary: 308.1mm (0.9% of effective aperture) Diameter of central hole in primary: 560mm (3%) +spider legs + hexapod structure: (7.7%) Primary and secondary optics

Joint HIFI-ALMA Calibration Discussion, Leiden, December, 19 th, 2002 C. Kramer, KOSMA Beam properties of HIFI/Herschel Estimate of the expected beam pattern One of the important parameters: the main beam efficiency: B eff =72% assuming an edge taper of 11dB, effective aperture of 3.28m B eff =57% at 1.9THz assuming a surface error of 6  m rms (specification is 3microns!) i.e. more than 30% of detected radiation from outside the main beam. (Urs Graf & CK, preliminary results.) [arcmin] [dB] contourlevels: -3dB,-10dB,-20dB,- 30dB,...

Joint HIFI-ALMA Calibration Discussion, Leiden, December, 19 th, 2002 C. Kramer, KOSMA Beam properties of HIFI/Herschel Plans to measure the beam pattern Possible primary calibrators Specific selection criteria: - Aperture efficiency: strong point-source (Mars at times, Uranus, Ceres) - Beam efficiency: strong source filling the beam - Beam pattern: very strong source, point-like, no good models needed: Mars General selection criteria: - good models (extrapolation to 2 THz): Uranus (e.g. R.Moreno), Mars? (e.g. Forget), Asteroids?? (e.g.Hughes) - few atmospheric lines: Uranus - Visibility !!! (Assumptions: Bandwidth=1 GHz, T sys (SSB)=1600K, white noise, A eff =56%, HPBW=11arcsec)

Joint HIFI-ALMA Calibration Discussion, Leiden, December, 19 th, 2002 C. Kramer, KOSMA Beam properties of HIFI/Herschel The best observing mode Stability time of the total system: Allan time = 150sec at 1MHz resolution (from SWAS experience) 5 -15sec at 1GHz resolution Double-Beamswitched Observations but: maximum throw is 3 arcmin only OTF-DBS for beam pattern observations ?