S. Guilloteau

A. Wootten

D. Hoffstadt

S. Radford

Jaap Baars?

Darrel Emerson?

Other affected DH/TLs.

3) Documents

To be ready 2 weeks in advance for distribution, specially to the outside members. We already have a lot, but are weak on operation issues. Links to most material are available at the ALMA Configuration Development WWW pages at The ALMA WWW Site. A good summary is given in the Project Book Chapter on Configurations.

- Nested Ring concept (Yun / Butler) Summary and ALMA Memo No. 320 Strawperson Donut/Doubling-Ring Configurations by M.S. Yun & L. Kogan.

- Spiral concept (Conway) See Conway's WWW site and specifically his Protomemo A Preliminary ALMA Zoom Array Design for the Chanjnantor Site by J. Conway.

- Simulations (Heddle) The guidelines from the meeting in March 2000 led to the creation of the Image Library . These images were then run through a set of AIPS simulations by Heddle, with these results.

- Multi-configuration aspects (Viallefond)

- Compact array issues (Morita / Guilloteau)

- Site issues (Radford / Butler)

- Operation concepts (Wootten / Guilloteau)

- Cost issues (Hofstadt / ? )

Goal of the meeting: select a baseline design to continue with detailed implementation work ...

Simulations

Steven says:

I have posted some preliminary results for the DOT model, imaged using A arrays at -23 declination, and for the M51 and CYG models imaged using D arrays at -23, -70 and +25 declinations, for both snapshot and 4 hour track. The D array results are a by product of creating snapshot UV data for use in hybrid array B and D (snapshot) arrays. I have no immediate answer as to why the difference images for the M51 D results at -23 are not centred around zero, but am pondering it. I hope to try something with the hybrid arrays tomorrow. See my site.

Metrics

John suggested that we arrive at the metric iteratively and collected the emails to alma-config on the subject.

Bryan wrote a useful memo summarizing previous discussions.

John elaborated a bit on the Woody suggestion in Bryan's memo; see his email.

And subsequent comment from David Woody and Mel Wright.

Simulation Strategy outline at the Tucson meeting is found here. What changes should we adopt based on our experiences so far?

Other Future Plans

The plans for the layout of the pads must be finalized by the beginning of construction. We hope that the first construction funds will arrive on 2001 Oct 1 when the FY2002 begins here. The project WBS has this date as 2002 Jan 1. Realistically, I think we need to inspect the pad sites before finalizing their location. As a start, Wootten compared pad locations for the spiral and nested ring arrays, and Butler and Radford did some studies in December 2001. There exists a list of possible problem pad locations for the 3km 1.6km and 0.8 km and Spiral array. Bryan visited a selection of these and found that about half appeared, in fact, to be OK. Are there any others which folks have worried about?

Next Meeting?