Other
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999alma.confe..68w&link_type=abstract
Science with the Atacama Large Millimeter Array (ALMA), Associated Universities, Inc., held October 6-8, 1999 at Carnegie Instit
Other
Array, Designs, Composite, Configuration, Hybrid, Zoomable, Compact, Rings, Antennas
Scientific paper
A class of designs for the ALMA is discussed which is very different from the array of about four identical nested rings considered previously. The new designs are composite, in that they are made up of several configurations of different sizes and very different shapes, hybrid in that they are planned to work well with some of the antennas on the stations of one configuration and the remainder on those of an adjacent configuration, and zoomable in that the antennas may be deployed to provide a synthesized beam whose width lies within about 1 percent of any required value in the entire range. A typical design is presented consisting of a compact configuration, with all of the stations packed closely within a disk, an intermediate configuration, in which the density of stations drops off as the square of the distance from the array centre, and an outer ring in the form of a circle or Reuleaux triangle. As well as the zoom property, the design has other advantages over an array of nested rings, including sidelobe levels that are nearly an order of magnitude lower and a capability to redeploy the antennas in order to provide near-circular beams when observing well away from the zenith. The mode of operation is likely to be very different, with one or two antennas being moved every day or 5 - 10 every week, rather than moving all the antennas at once every few months or so. The advantages and disadvantages are summarized and it is concluded that the former probably outweigh the latter considerably, and that designs of this type are competitive with nested rings for the ALMA.
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