Agenda for meeting Mon, 1 February 2000 at 4pm EST.
Date: 1 February 2000
Time: 4:00 pm EST (2:00 pm Socorro, 2:00 pm Tucson)
Phone: (804)296-7082 (CV SoundStation Premier Conference phone).
Past minutes, etc on MMA Imaging and Calibration Division Page
Minutes
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From the joint ALMA/US-ALMA/EU DH meeting.
Correlator PDR report is ready.
Project book updates on track--Test Interferometer by 7 Feb, ALMA by 31 Mar.
New ALMA costing due by 11 Feb.
Change of meeting time.
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I would like to ask you any comments about following discussion.
Even for the compact configuration of "original" ALMA (64 x 12 m), there is a central (U,V) hole around (U,V) distance from 0 to 1.3 D (D = 12 m / \lambda). Ultra compact array with the smaller dishes can be recover this (U,V) hole.
But, for mosaicing imaging with a single dish image, equivalent (U,V) coverage of mosaicing is smoother than that of single pointing observations. So, we still have some response at the central (U,V) hole. The sensitivity level depends on illumination pattern of each antenna but maybe 10 - 30 % of zero spacing sensitivity (Is it correct?).
If we want to recover such a central (U,V) hole by the ultra compact array with the smaller dishes, the sensitivity at the (U,V) of the ultra compact array should be larger than the original sensitivity of homogeneous array. It means that the number of the smaller dishes should be 0.1 - 0.3 x (64 x 12^2 / 8^2) ~ 14 - 42.
Is this discussion correct?
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Joint ALMA Science Advisory Committee Meeting 14 Feb 2000.
Minutes are being approved and discussed. Next meeting 1630 UT on 14 Feb 2000.
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The next meeting will occur on 23 Feb 1999.
Min updated the "array design and development" part of the ALMA web site. The working version is currently located in his area, here . A face-to-face review is being planned for 20-21 March 2000 in Tucson. This is the same day as the JRDG meeting and reciever CDR in CV but perhaps the conflict is not severe for many except Al and Stephane.
The configuration portion of the Project Book needs a rewrite.
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Action Items 1Feb2000
DECISION: Configurations--where are we? March meeting plans...
DECISION: Implementation of 183 GHz WVR?
DECISION: Is a nutating secondary necessary?
DECISION: What is the total power specification on the ALMA?
DECISION: What is the effect of 1/f noise in the HEMT amplifiers of SIS receivers upon our ability to combine total power and interferometric images into a faithful representation of the sky?
MEETINGS: SAC phone meeting 14 February 2000 for members only.
AGL meeting 16 Feb 2000, followed by general meeting 17-19 Feb 2000, Tokyo.
System/Test Interferometer PDR Garching 28-29 Feb 99.
MOC meeting 2-3 March 2000. D. C.
ASAC face-to-face meeting 10-11 March 2000. Leiden.
JRDG face-to-face meeting 20-21 March 2000. CV
Configuration face-to-face meeting 20-21 March 2000. Tucson.
SSR face-to-face meeting end of April, Paris.
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Travel
AW -> AAS 12-16 Jan 2000. AW -> Tokyo 16-21 Feb 2000. AW -> Leiden 8 - 13 March 2000. ------