ALMA

Recent Extended Configuration Work

  • Holdaway has been working on a mod to the current design, which was optimized for the most extended configuration. In this design, some of the inner configurations displayed inner sidelobes as large as 20 percent; mating to the most extended Conway configuration was non-optimal. In the modification, three configurations among the most extended are to be optimized.
    • Telecon of 18 March: Holdaway reported good progress on the most extended 'C' configuration and the intermediate 'B' configuration. Sidelobes are from two hour tracks off zenith. We aimed at NS 10% beam ellipticity so about 25 deg off zenith. -48 deg dec
      • 'B' configuration. Six new stations. 3-4 stations NW of APEX, one along there. Should be able to reuse one of the old ones, should be OK. 2 N of pipeline between Chascon and Chajnantor along road from Pampa la Bola. Probably OK. Three are south of pipeline roughly following it. These are quantitatively better than what we had before. B configuration has 9.5% max inner sidelobes, beam 27.8 mas x 25.6 mas. 8% noncircular, about 5% off target in resolution slightly higher. 18Mar08 B Array.
      • 'C' configuration. No new stations (other than those in 'B'. 5.8% sidelobes beam 19 x 16.7 mas aimed at 16.6 mas round.
  • Next telecon Weds 26 March.

-- AlWootten - 18 Mar 2008

Topic attachments
I Attachment Action Size Date Who Comment
YY_b5_Hills.pdfpdf YY_b5_Hills.pdf manage 101 K 2008-03-18 - 17:51 AlWootten uv plots from Hills
This topic: ALMA > WebHome > AlmaSci > AlmImcal > MonthlyMeetings > 19Mar08Agenda > ExtendedConfiguration
Topic revision: 2008-03-18, AlWootten
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