Design of Corrective Beam Waveguide System for the ALMA/ACA 7-m Anten

Details Design of Corrective Beam Waveguide System for the ALMA/ACA 7-m Anten Design of Corrective Beam Waveguide System for the ALMA/ACA 7-m Anten

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasj...61.1065s&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.61, No.5, pp.1065--1080

Physics

Optics

Instrumentation: Optics, Instrumentation: Telescopes, Millimeter/Submillimeter

Scientific paper

A beam waveguide system for connecting the ALMA front-end, which has been designed for the Cassegrain focus of the ALMA 12-m antenna, with the ALMA/ACA 7-m antenna was designed. The beam waveguide system, covering 30-950 GHz, consists of flat mirrors or prisms to modify the boresight tilt angle from the front-end, and recovers more than the half of the sensitivity loss caused by a misalignment between the front-end optics and the 7-m antenna. No mechanical alignment procedure is needed for installation of the beam waveguide system, and thus it does not impact on the maintenance/operation scheme of the front-end system. Beam-pattern measurements in the frequency ranges of ALMA bands 4 (144 GHz), 6 (252 GHz), and 8 (385 GHz) have confirmed that directions of the radiation patterns transmitted to the subreflector are successfully shifted by the beam waveguide system without any serious deformation of the beam. The aperture efficiencies calculated from the measured radiation patterns were determined to be 84.6% at 144 GHz, 86.1% at 252 GHz, and 84.8% at 385 GHz, which are consistent with those of a simulated radiation pattern.

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