MMA Imaging and Calibration Group

Agenda for meeting Tuesday, 2 October 2001 at 4pm EDT.

Date: 2 Oct 2001

Time: 4:00 pm EDT (2:00 pm Socorro, 1:00 pm Tucson)

Phone: (434) 972 7268 (CV SoundStation Premier Conference phone).

Past minutes, etc on MMA Imaging and Calibration Division Page

Agenda
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News. -Wootten

News from the joint DH meeting on Monday, from my point of view.

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Meetings This Week-Wootten

Configuration teleconference held this morning.

It was time for monthly reports, now become bimonthly reports. The July/August 2001 NSF Bi-Monthly Report is available at Carolyn's Place.

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ACA Report -- Holdaway, Wootten

AW updated the science summary of ALMA+ACA simulations.

Stephane's group has performed some simulations on a file provided by Crutcher:

"We made a few test with Dick Crutcher polarisation images. Results can be downloaded at here. They are astonishing: ALMA+SD completely fails. The "hybrid" technique does a decent job without errors, but has more limited success in the "typical" error case produced. Errors are dominated by the pointing error in this case (just by accident, we don't control the random numbers)."   Some comments from AW are on
the science summary page (see above).

Mark has put his surface error simulations on a WWW site.
These simulations, including pointing errors, surface errors and aperture illumination offset with an MEM image reconstruction technique, basically verified results from IRAM incorporating pointing errors and a CLEAN-based image reconstruction. Some of the improvement in image quality found by including the ACA data could also be achieved by inclusion of the SMA instead.   He found that the expected frequency dependence was much less steep than expected.  Experiment showed that this was probaby traced to inclusion of the aperture illumination offsets.  Emerson suggested that the latter could be dealt with as simply as treating it as a (u,v,w) offset.  If this does not turn out to be accurate, Holdaway suggests software correction, time consuming, or tightening of antenna specifications.

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Upcoming Meetings - Wootten

Next ACA Tiger Team telecon Friday1415 UT.  Next configuration telecon 16 Oct 1415 UT.  ASAC telecon 10 October 1415 UT.

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Calibration PDR -- Wootten

Wootten's draft final report is available.

Travel

 Oh, always

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